Circuit breaker isolation base

Abstract

This invention provides an insulating base for circuit breakers that eliminates the need for component management for all types of 2-pole, 3-pole, and 4-pole circuits, and by using small components that are less prone to warping, it can suppress high-temperature creep when interposed between the circuit breaker and the mounting panel, while also reducing manufacturing costs. [Solution] The insulating bases 11 and 12 are positioned between the back surface of a circuit breaker 2 of the rear connection type, which can be used for any of the 2-pole, 3-pole, or 4-pole types, and the mounting panel 1. The insulating bases 11 and 12 can be used in common with any of the circuit breakers 2 of the 2-pole, 3-pole, or 4-pole types, and consist of a plurality of divided bodies 20, 21, and 22 arranged in the width direction of the circuit breaker in which a plurality of studs 7 protrude, and the plurality of divided bodies have stud insulating parts 15a to 15c which are cylindrical spaces that cover the outer circumference of the rod-shaped part 7a of the studs 7.

Description

Technical Field

[0001] The present invention relates to an insulating base of a circuit breaker used when fixing a rear connection type circuit breaker to a mounting panel provided inside a switchboard.

Background Art

[0002] In a rear connection type circuit breaker, studs for connecting to a power supply side terminal and a load side terminal protrude from the rear surface of the circuit breaker (for example, Patent Document 1). When fixing this rear connection type circuit breaker to a mounting panel provided inside a switchboard, an insulating base made of synthetic resin is interposed between the rear surface of the circuit breaker and the mounting panel. The insulating base ensures an insulation distance between the power supply side and load side studs protruding from the rear surface of the circuit breaker and the mounting panel. By the way, there are circuit breakers for 2 poles, 3 poles, and 4 poles, and when the number of poles is different, the size of the rear surface of the circuit breaker is different. Therefore, insulating bases used for rear connection type circuit breakers also require a plurality of types of insulating bases with different sizes for 2 poles, 3 poles, and 4 poles, which poses a problem in terms of parts management.

[0003] Also, if a large insulating base such as an insulating base for 4 poles is formed in a state with a large warp, high-temperature creep may occur in the insulating base interposed between the rear surface of the circuit breaker and the mounting panel, and there is a risk of damage.

[0004] Therefore, only the insulating base for 3 poles used in the 3-pole circuit breaker with a large number of products shipped was manufactured, a part of the insulating base for 3 poles was cut, and the cut parts were combined to produce insulating bases for 2 poles and 4 poles.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

[0006] However, the process of combining parts that have had portions of the three-pole insulating base cut off is very time-consuming and presents problems in terms of manufacturing costs.

[0007] Therefore, the present invention has been made in view of the above-mentioned problems, and aims to provide an insulating base for a circuit breaker that eliminates the need for component management for all types of 2-pole, 3-pole, and 4-pole types, and by using a small component that is less prone to warping, it is possible to suppress high-temperature creep when interposed between the circuit breaker and the mounting panel, and to reduce manufacturing costs. [Means for solving the problem]

[0008] To achieve the above objective, an insulating base for a circuit breaker according to one aspect of the present invention is an insulating base that is placed between the back surface of a circuit breaker of any type of back-connection (2-pole, 3-pole, or 4-pole) and a mounting panel, and insulates the mounting panel from a plurality of studs that are connected to the terminals of the circuit breaker and protrude inward from the back surface, and is usable in common with any type of circuit breaker (2-pole, 3-pole, or 4-pole), and is composed of a plurality of divided parts arranged in the width direction of the circuit breaker from which the plurality of studs protrude, and the plurality of divided parts have a stud insulating part that is a cylindrical space that covers the outer circumference of the rod-shaped part of the stud. [Effects of the Invention]

[0009] The insulating base for the circuit breaker of the present invention eliminates the need for component management for all types of 2-pole, 3-pole, and 4-pole circuits, and by using a small component that is less prone to warping, it is possible to suppress high-temperature creep when interposed between the circuit breaker and the mounting panel, and to reduce manufacturing costs. [Brief explanation of the drawing]

[0010] [Figure 1]This is a perspective view showing a rear-connection type 3-pole circuit breaker according to the present invention, fixed to a mounting panel located inside a distribution board. [Figure 2] This diagram shows the circuit breaker according to the present invention fixed to a mounting panel, viewed from the width direction. [Figure 3] This is a view along the line II-II in Figure 2. [Figure 4] This is a perspective view showing studs used in back-connected circuit breakers. [Figure 5] This diagram shows a 3-pole insulating base interposed between the back surface of a 3-pole circuit breaker of the rear-connection type and the mounting panel. [Figure 6] This diagram shows the load-side insulating base and power supply-side insulating base interposed between the back surface and the mounting panel of a 3-pole circuit breaker with a rear connection type. [Figure 7] This is a perspective view showing the first to third divided parts that constitute the insulating base for a three-pole device. [Figure 8] This diagram shows a plan view of the first to third divided parts that constitute the insulating base for a three-pole device. [Figure 9] This diagram shows the load-side insulating base and power supply-side insulating base interposed between the back surface and the mounting panel of a rear-connection type 2-pole circuit breaker. [Figure 10] This is a perspective view showing that the insulating base for two poles is composed of the first and third sections of the insulating base for three poles. [Figure 11] This diagram shows the load-side insulating base and power supply-side insulating base interposed between the back surface and the mounting panel of a rear-connection type 4-pole circuit breaker. [Figure 12] This is a perspective view showing that the insulating base for a 4-pole connector is composed of one first segment, two second segments, and one third segment of the insulating base for a 3-pole connector. [Figure 13] This is a plan view showing an insulating base with a high rating (current capacity). [Figure 14] This is a perspective view showing the first to third divided sections that constitute the high-rated insulating base.

Embodiments for Carrying Out the Invention

[0011] Next, referring to the drawings, the first to third embodiments of the present invention will be described. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic, and the relationship between the thickness and the planar dimensions, the ratio of the thicknesses of each layer, etc. are different from the actual ones. Therefore, the specific thickness and dimensions should be determined in consideration of the following description. Also, it is a matter of course that there are parts where the dimensional relationships and ratios are different between the drawings.

[0012] In addition, the first to third embodiments shown below exemplify devices and methods for embodying the technical idea of the present invention, and the technical idea of the present invention does not specify the material, shape, structure, arrangement, etc. of the components as the following. The technical idea of the present invention can be variously modified within the technical scope defined by the claims described in the claims. In the following description, terms indicating directions such as "vertical direction", "width direction", "depth direction", "right side part", "left side part", etc. are used by referring to the directions of the attached drawings. [Regarding the Circuit Breaker Fixed to the Mounting Panel]

[0013] FIGS. 1 to 3 show a three-pole circuit breaker 2 of the back connection type fixed to a mounting panel 1 provided inside a switchboard. FIG. 4 shows the shape of a stud 7 used in the three-pole circuit breaker 2 of the back connection type.

[0014] As shown in FIGS. 1 and 2, the three-pole circuit breaker 2 has a case 3 made of a rectangular parallelepiped insulator, and inside the case 3, a breaking mechanism unit for breaking the circuit when a current of a predetermined value or more flows is accommodated. Although not shown, the breaking mechanism unit is composed of a fixed contact, a movable contact, a heater, a bimetal, an arc extinguishing device, etc. A handle 4 for manual on / off operation is provided on the front side in the depth direction of the case 3.

[0015] For the three-pole circuit breaker 2, on the other longitudinal side of the case 3, the load-side terminal 5 of the interrupting mechanism part is provided so as to be exposed to the outside. The load-side terminal 5 is composed of an R-phase load-side terminal 5R, an S-phase load-side terminal 5S, and a T-phase load-side terminal 5T arranged side by side from one side to the other side in the width direction. On one longitudinal side of the case 3, the power-source-side terminal 6 of the interrupting mechanism part is also provided so as to be exposed to the outside, and R-phase terminals, S-phase terminals, and T-phase terminals are arranged side by side from one side to the other side in the width direction (not shown).

[0016] For the back-surface connection type circuit breaker 2, six studs 7 are connected to the load-side terminal 5 and the power-source-side terminal 6. Hereinafter, the back-surface connection type circuit breaker 2 is simply referred to as the circuit breaker 2.

[0017] As shown in FIG. 4, the stud 7 includes a stud bar 7a having a diameter d1, a threaded hole 7b formed at one end of the stud bar 7a, a plate-like stud connection part 7c having an outer shape larger than the diameter of the stud bar 7a formed at the other end of the stud bar 7a, and through holes 7d and 7e formed in the stud connection part 7c. In the stud bar 7a, a press-fitting hole (not shown) is formed in a direction orthogonal to the axial direction of the stud bar 7a, and a rod-shaped spring pin 8 is press-fitted into this press-fitting hole in a state of protruding from the outer periphery of the stud bar 7a.

[0018] To connect the stud 7 to the load-side terminal 5 of the circuit breaker 2, as shown in FIG. 3, the stud bar 7a of the stud 7 is inserted from the back surface of the circuit breaker 2, and one end of the stud bar 7a is brought into contact with the back surface of the R-phase load-side terminal 5R. Then, a terminal screw 9 that has passed through a terminal hole (not shown) of the R-phase load-side terminal 5R is screwed into the threaded hole 7b of the stud bar 7a. Thereby, the stud bar 7a is connected to the R-phase load-side terminal 5R, and the stud 7 protrudes from the back surface of the circuit breaker 2. The structure for connecting the stud 7 to the S-phase load-side terminal 5S and the T-phase load-side terminal 5T is the same as the structure for connecting the stud 7 to the R-phase load-side terminal 5R. Further, the connection structure between the stud 7 and the power-source-side terminal is also the same as the connection structure between the stud 7 and the load-side terminal 5.

[0019] Here, when fixing the circuit breaker 2 to the mounting panel 1, the studs 7 are positioned so that they protrude further in the depth direction than the mounting panel 1, and a 3-pole load-side insulating base 11 and a 3-pole power supply-side insulating base 12, both made of thermoplastic resin, are interposed between the back surface of the circuit breaker 2 and the mounting panel 1. The 3-pole load-side insulating base 11 is a component that ensures the insulating distance between the studs 7 connected to the load-side terminal 5 and the mounting panel 1, and the 3-pole power supply-side insulating base 12 is a component that ensures the insulating distance between the studs 7 connected to the power supply-side terminal 6 and the mounting panel 1. [Regarding the insulating base for 3-pole applications]

[0020] As shown in Figures 5(a) and (b), the load-side insulating base 11 for three poles comprises a base body 13 in the shape of a roughly rectangular parallelepiped, three cylindrical parts 14a to 14c protruding from the back surface of the base body 13, stud insulating parts 15a to 15c in a cylindrical space penetrating from the surface of the base body 13 to the ends of the cylindrical parts 14a to 14c, and a fixing screw insertion hole 16. As shown in Figure 5(a), the diameter of the stud insulating parts 15a to 15c is set to the same dimension d1 as the diameter of the stud rod 7a. On the inner surface of the stud insulating parts 15a to 15c, a pair of grooves 17a, 17a are formed in a direction perpendicular to the axis of the stud insulating parts 15a to 15c, and another pair of grooves 17b, 17b are formed at a position offset by 45° around the axis from the pair of grooves 17a, 17a. The ends of the spring pin 8, which protrudes from the outer circumference of the stud rod 7a of the stud 7, fit into one of these pairs of grooves 17a, 17a, or one of the pairs of grooves 17b, 17b.

[0021] As shown in Figure 6, the load-side insulating base 11 for the 3-pole circuit is positioned on the top of the mounting panel 1 such that the stud insulating portion 15a is located on one side in the width direction and the stud insulating portion 15c is located on the other side in the width direction. Then, as shown in Figure 3, the mounting panel 1 is positioned on the top surface with the three cylindrical portions 14a to 14c inserted into the three mounting holes 1a formed in the width direction of the mounting panel 1. Then, the three studs 7 connected to the load-side terminal 5 of the circuit breaker 2 are inserted into the stud insulating portions 15a to 15c of the load-side insulating base 11 so that the stud insulating portions 15a to 15c cover the outer circumference of the stud rod 7a. In addition, both ends of the spring pin 8 protruding from the outer circumference of the stud rod 7a enter either the pair of grooves 17a, 17a or the pair of grooves 17b, 17b. As a result, the studs 7 connected to the load-side terminal 5 are positioned with the stud connection portion 7c facing vertically and preventing rotation, as shown in Figure 1.

[0022] On the other hand, the power supply side insulating base 12 for the 3-pole circuit breaker is a component of the same shape as the load side insulating base 11 for the 3-pole circuit breaker. As shown in Figure 6, it is positioned on the top of the mounting panel 1 such that the stud insulating portion 15a is located on one side in the vertical direction and the stud insulating portion 15c is located on one side in the width direction. In other words, the power supply side insulating base 12 is positioned on the top of the mounting panel 1 in a position rotated 180° relative to the position of the load side insulating base 11. The mounting panel 1 is then positioned with three cylindrical portions 14a to 14c inserted into three mounting holes (not shown) formed in the width direction on one side in the vertical direction of the mounting panel 1. The three studs 7 connected to the power supply side terminals 6 of the circuit breaker 2 are then inserted into the stud insulating portions 15a to 15c of the load side insulating base 11, so that the stud insulating portions 15a to 15c cover the outer circumference of the stud rods 7a. Furthermore, both ends of the spring pin 8 protruding from the outer circumference of the stud rod 7a fit into either the pair of grooves 17a, 17a or the pair of grooves 17b, 17b. As a result, the stud 7 connected to the power supply terminal 6 is positioned with the stud connection portion 7c facing in the width direction, as shown in Figure 1, and is prevented from rotating.

[0023] Then, a 3-pole power supply side insulating base 12 is placed between one vertical back surface of the circuit breaker 2 and the mounting panel 1, and a 3-pole load side insulating base 11 is placed between the other vertical back surface of the circuit breaker 2 and the mounting panel 1. With this setup, a fixing screw 10, which penetrates the case 3 from the front to the back in the depth direction, is passed through the fixing screw insertion holes 16 of the 3-pole load side insulating base 11 and the power supply side insulating base 12 and screwed into a screw hole (not shown) provided in the mounting panel 1. This fixes the circuit breaker 2 to the mounting panel 1, and the stud insulating portions 15a to 15c of the 3-pole load side insulating base 11 cover the outer circumference of the stud rod 7a of the stud 7 connected to the load side terminal 5, and the stud insulating portions 15a to 15c of the 3-pole power supply side insulating base 12 cover the outer circumference of the stud rod 7a of the stud 7 connected to the power supply side terminal 6, thereby ensuring an insulating distance between the stud 7 and the mounting panel 1.

[0024] The load-side insulating base 11 for the 3-pole system is composed of a first segment 20, a second segment 21, and a third segment 22, as shown in Figures 7 and 8.

[0025] The first divided body 20 comprises a divided base body 13a, a cylindrical portion 14a protruding from the back surface of the divided base body 13a, a stud insulating portion 15a of the cylindrical space penetrating from the surface of the divided base body 13a to the end of the cylindrical portion 14a, and a convex engaging portion 23 protruding from the right side of the divided base body 13a.

[0026] The second divided body 21 comprises a divided base body 13b, a cylindrical portion 14b protruding from the back surface of the divided base body 13b, a stud insulating portion 15b of the cylindrical space penetrating from the surface of the divided base body 13b to the end of the cylindrical portion 14b, a fixing screw insertion hole 16, a recessed engaging portion 24 provided on the left side of the divided base body 13b, and a convex engaging portion 23 protruding from the right side of the divided base body 13b.

[0027] The third divided body 22 comprises a divided base body 13c, a cylindrical portion 14c protruding from the back surface of the divided base body 13c, a stud insulating portion 15c of a cylindrical space penetrating from the surface of the divided base body 13c to the end of the cylindrical portion 14c, a fixing screw insertion hole 16, and a recessed engaging portion 24 provided on the left side of the divided base body 13c.

[0028] The protruding engagement portion 23 provided on the right side of the divided base body 13a of the first divided body 20 is composed of a large protrusion 25 and a small protrusion 26. The large protrusion 25 is composed of an arm portion 25a that protrudes from the right side of the divided base body 13a and a protrusion 25b that extends perpendicularly from the tip of the arm portion 25a toward the cylindrical portion 14a. The small protrusion 26 is composed of an arm portion 26a that protrudes from the right side of the divided base body 13a and a protrusion 26b that extends perpendicularly from the tip of the arm portion 26a toward the cylindrical portion 14a. As shown in Figure 8, the width dimension H1 of the large protrusion 25 is set to be larger than the width dimension H2 of the small protrusion 26 (H1 > H2).

[0029] The recessed engagement portion 24 provided on the left side of the divided base body 13b of the second divided body 21 is composed of a large recess 27 and a small recess 28. The large recess 27 is composed of an arm insertion portion 27a into which the arm portion 25a of the large protrusion 25 fits, and a recess 27b into which the protrusion 25b of the large protrusion 25 fits. The small recess 28 is composed of an arm insertion portion 28a into which the arm portion 26a of the small protrusion 26 fits, and a recess 28b into which the protrusion 26b of the small protrusion 26 fits.

[0030] Furthermore, the convex engaging portion 23 provided on the right side of the divided base body 13b of the second divided body 21 has the same shape as the convex engaging portion 23 provided on the right side of the divided base body 13a of the first divided body 20, and the concave engaging portion 24 provided on the left side of the divided base body 13c of the third divided body 22 has the same shape as the concave engaging portion 24 provided on the left side of the divided base body 13b of the second divided body 21.

[0031] The first segment 20, second segment 21, and third segment 22 of the above configuration are integrated by engaging the convex engaging portion 23 of the first segment 20 with the concave engaging portion 24 of the second segment 21, and engaging the convex engaging portion 23 of the second segment 21 with the concave engaging portion 24 of the third segment 22, thereby forming the load-side insulating base 11 for three poles shown in Figures 5(a) and (b). Here, the segment connecting portion described in the present invention corresponds to the convex engaging portion 23 of the first segment 20, the concave engaging portion 24 of the second segment 21, the convex engaging portion 23 of the second segment 21, and the concave engaging portion 24 of the third segment 22.

[0032] Furthermore, the power supply side insulating base 12 for the 3-pole system is a component with the same shape as the load side insulating base 11 for the 3-pole system, and is formed by integrating the first divided body 20, the second divided body 21, and the third divided body 22, so a detailed explanation is omitted. [Regarding the insulating base for 2-pole applications]

[0033] Next, Figure 9 shows the load-side insulating base 30 and power supply-side insulating base 31 for two poles, which are used when mounting the two-pole circuit breaker 29 to the mounting panel 1. This two-pole circuit breaker 29 also has studs 7, which are the same shape as the studs 7 shown in Figure 4, connected to the load-side terminal and the power supply-side terminal.

[0034] The load-side insulating base 30 and power supply-side insulating base 31 for two poles are composed of the first divided body 20 and the third divided body 22 that make up the load-side insulating base 11 for three poles shown in Figure 7.

[0035] In other words, as shown in Figure 10, the load-side insulating base 30 for two poles is formed by integrating the first divided body 20 and the third divided body 22 by engaging the convex engaging portion 23 of the first divided body 20 with the concave engaging portion 24 of the third divided body 22. Similarly, the power supply-side insulating base 31 for two poles is also formed by integrating the first divided body 20 and the third divided body 22 by engaging the convex engaging portion 23 of the first divided body 20 with the concave engaging portion 24 of the third divided body 22.

[0036] Here, the segmented body connecting portion described in the present invention corresponds to the convex engaging portion 23 of the first segmented body 20 and the concave engaging portion 24 of the third segmented body 22. [Regarding the insulating base for 4-pole applications]

[0037] Next, Figure 11 shows the load-side insulating base 34 and power supply-side insulating base 35 for four poles, which are used when mounting the four-pole circuit breaker 33 to the mounting panel 1. This four-pole circuit breaker 33 also has studs 7 with the same shape as the studs 7 shown in Figure 4 connected to the load-side terminal and the power supply-side terminal.

[0038] The load-side insulating base 34 and power supply-side insulating base 35 for the 4-pole system are composed of one first segment 20, two second segments 21, and one third segment 22, which constitute the load-side insulating base 11 for the 3-pole system shown in Figure 7. Here, the two second segments 21 are referred to as second segment 21A and second segment 21B, which have the same shape.

[0039] As shown in Figure 12, the load-side insulating base 34 for four poles is formed by integrating the first segment 20, the second segment 21A, the second segment 21B, and the third segment 22 by engaging the convex engaging portion 23 of the first segment 20 with the concave engaging portion 24 of the second segment 21A, the convex engaging portion 23 of the second segment 21A with the concave engaging portion 24 of the second segment 21B, and the convex engaging portion 23 of the second segment 21B with the concave engaging portion 24 of the third segment 22. Similarly, the power supply-side insulating base 35 for four poles is also formed by integrating the first segment 20, the second segment 21A, the second segment 21B, and the third segment 22.

[0040] Here, the segmented connecting portion described in the present invention corresponds to the convex engaging portion 23 of the first segmented body 20, the concave engaging portion 24 of the second segmented body 21A, the convex engaging portion 23 of the second segmented body 21A, the concave engaging portion 24 of the second segmented body 21B, the convex engaging portion 23 of the second segmented body 21B, and the concave engaging portion 24 of the third segmented body 22. [Regarding the effects of insulating bases for 2-pole to 4-pole applications]

[0041] Next, we will explain the effects and benefits of the three-pole insulating bases 11 and 12 shown in Figures 5 to 8 (load-side insulating base 11 and power supply-side insulating base 12), the two-pole insulating bases 30 and 31 shown in Figures 9 and 10 (load-side insulating base 30 and power supply-side insulating base 31), and the four-pole insulating bases 34 and 35 shown in Figures 11 and 12 (load-side insulating base 34 and power supply-side insulating base 35).

[0042] The insulating bases 30 and 31 for two poles and the insulating bases 34 and 35 for four poles are constructed by using one of the components of the first divided body 20, the second divided body 21, and the third divided body 22 that make up the insulating bases 11 and 12 for three poles.

[0043] As a result, the insulating bases 30 and 31 for 2 poles and insulating bases 34 and 35 for 4 poles do not require cutting, compared to the conventional method where a portion of the insulating base for 3 poles was cut and the cut parts were combined to form the insulating bases for 2 poles and 4 poles. This allows for the formation of the insulating bases 30 and 31 for 2 poles and 34 and 35 for 4 poles in a short time, thereby reducing the manufacturing cost of insulating bases for 2 poles to 4 poles.

[0044] Furthermore, only component management, such as inventory levels for the 3-pole insulating bases 11 and 12, is required, eliminating the need for component management for the 2-pole insulating bases 30 and 31 and the 4-pole insulating bases 34 and 35.

[0045] Furthermore, since the first segment 20, the second segment 21, and the third segment 22 are formed as small parts that are less prone to warping, high-temperature creep can be suppressed when they are interposed between the back surface of the circuit breaker 2 and the mounting panel 1 as insulating bases for 2-pole, 3-pole, and 4-pole circuits.

[0046] Furthermore, the convex engagement portion 23 and concave engagement portion 24 that connect any of the first divided body 20, the second divided body 21, and the third divided body 22 are configured such that the convex engagement portion 23 is composed of a large convex portion 25 and a small convex portion 26, and the concave engagement portion 24 is composed of a large concave portion 27 and a small concave portion 28. As a result, for example, if the second divided body 21 of the load-side insulating base 11 for three poles shown in Figure 7 is inverted vertically, with the cylindrical portion 14b at the top and the divided base body 13a at the bottom, and an attempt is made to connect it between the first divided body 20 and the third divided body 22, the connection of the convex engagement portion 23 and the concave engagement portion 24 will be impossible. Also, if the second divided body 21 of the load-side insulating base 11 for three poles shown in Figure 7 is inverted horizontally, and an attempt is made to connect it between the first divided body 20 and the third divided body 22, the connection of the convex engagement portions 23 to each other and the connection of the concave engagement portions 24 to each other will be impossible. Furthermore, it is impossible to connect parts of the divided sections of the 2-pole load-side insulating base 30, the 2-pole power supply-side insulating base 31, the 4-pole load-side insulating base 34, and the 4-pole power supply-side insulating base 35 if one attempts to connect them in the opposite orientation (upside down or left-right).

[0047] Therefore, by providing at least one of the convex engaging portion 23 and the concave engaging portion 24 on the first segment 20, the second segment 21, and the third segment 22, it is possible to prevent misassembly of the first segment 20, the second segment 21, and the third segment 22 when forming the insulating bases 30, 31 for two poles, 11, 12 for three poles, and 34, 35 for four poles. [Regarding the use of insulating bases in circuit breakers with different ratings]

[0048] Incidentally, there are two types of circuit breakers 2 with the same number of poles (for example, for 3 poles) but different ratings (current capacity). These two types of circuit breakers with different ratings have cases 3 of the same size (the vertical, width, and depth dimensions of case 3 in Figure 1 are the same). The circuit breaker 2 with a smaller rating uses a stud 7, as shown in Figure 4, with a stud rod 7a diameter set to d1 (hereinafter referred to as the stud 7 with a smaller rating). On the other hand, the stud used in the circuit breaker 2 with a larger rating (hereinafter referred to as the stud 7 with a larger rating) is equipped with a stud rod 7a, a screw hole 7b, a stud connection part 7c, through holes 7d, 7e, and a spring pin 8 that is press-fitted in a direction perpendicular to the axial direction of the stud rod 7a and has both ends protruding from the outer circumference of the stud rod 7a, similar to the stud 7. However, the diameter of the stud rod 7a is set to a dimension d2 (d2 > d1) which is larger than dimension d1. Here, the first rod-shaped part described in the present invention corresponds to the stud rod 7a of the stud 7 with a larger rating.

[0049] Figures 13 and 14 show a 3-pole insulating base 40 interposed between a high-rated 3-pole circuit breaker 2 and a mounting panel 1 (hereinafter referred to as the high-rated insulating base 40). This high-rated insulating base 40 is a general term for the load-side insulating base and the power supply-side insulating base. Furthermore, the high-rated insulating base 40 has substantially the same external shape as the load-side insulating base 11 shown in Figures 5(a) and (b) used in the low-rated circuit breaker 2. Note that the same reference numerals are used for components that are the same as those shown in Figures 5(a) and (b), and their descriptions are omitted. Here, the first insulating base described in the present invention corresponds to the high-rated insulating base 40, and the second insulating base described in the present invention corresponds to the low-rated load-side insulating base 11.

[0050] The insulating base 40 with a high rating is composed of a first segment 41, a second segment 42, and a third segment 43, as shown in Figure 14.

[0051] The first divided body 41 comprises a divided base body 44a, a cylindrical portion 45a protruding from the back surface of the divided base body 44a, a stud insulating portion 46a of a cylindrical space penetrating from the surface of the divided base body 44a to the end of the cylindrical portion 45a, a fixing screw insertion hole 16, and a recessed engaging portion 24 provided on the right side of the divided base body 44a. The diameter of the stud insulating portion 46a is set to dimension d2 (d2 > d1). On the inner surface of the stud insulating portion 46a, a pair of grooves 47a, 47a are formed in a direction perpendicular to the axis of the stud insulating portion 46a, and another pair of grooves 47b, 47b are formed at a position shifted 45° around the axis relative to the pair of grooves 47a, 47a. Here, the grooves 47a, 47a, 47b, 47b formed on the inner surface of the stud insulation portion 46a are formed at different circumferential positions from the grooves 17a, 17a, 17b, 17b formed on the inner surface of the stud insulation portion 15a of the load-side insulation base 11 shown in Figure 5(a).

[0052] The second divided body 42 comprises a divided base body 44b, a cylindrical portion 45b protruding from the back surface of the divided base body 44b, a stud insulating portion 46b of a cylindrical space penetrating from the surface of the divided base body 44b to the end of the cylindrical portion 45b, a fixing screw insertion hole 16, a convex engaging portion 23 protruding from the left side of the divided base body 44b, and a concave engaging portion 24 provided on the right side of the divided base body 13b. The diameter of the stud insulating portion 46b is set to dimension d2 (d2 > d1). A pair of grooves 47a, 47a are formed on the inner surface of the stud insulating portion 46b, and another pair of grooves 47b, 47b are formed at a position offset by 45° around the axis from the pair of grooves 47a, 47a. The grooves 47a, 47a, 47b, 47b formed on the inner surface of these stud insulating portions 46b are also formed at different circumferential positions from the grooves 17a, 17a, 17b, 17b formed on the inner surface of the stud insulating portion 15b of the load-side insulating base 11 shown in Figure 5(a).

[0053] The third divided body 43 comprises a divided base body 44c, a cylindrical portion 45c protruding from the back surface of the divided base body 44c, a stud insulating portion 46c of a cylindrical space penetrating from the surface of the divided base body 44c to the end of the cylindrical portion 14c, and a convex engaging portion 23 protruding from the left side of the divided base body 44c. The diameter of the stud insulating portion 46c is set to dimension d2 (d2 > d1). A pair of grooves 47a, 47a are formed on the inner surface of the stud insulating portion 46c, and another pair of grooves 47b, 47b are formed at a position offset by 45° around the axis from the pair of grooves 47a, 47a. The grooves 47a, 47a, 47b, 47b formed on the inner surface of these stud insulating portions 46c are also formed at different circumferential positions from the grooves 17a, 17a, 17b, 17b formed on the inner surface of the stud insulating portion 15b of the load-side insulating base 11 shown in Figure 5(a). Here, the first stud insulating portion described in the present invention corresponds to the stud insulating portion 46a, the stud insulating portion 46b, and the stud insulating portion 46c.

[0054] The first segment 41, second segment 42, and third segment 43 of the above configuration are integrated by engaging the convex engaging portion 23 of the second segment 42 with the concave engaging portion 24 of the first segment 41, and engaging the convex engaging portion 23 of the third segment 43 with the concave engaging portion 24 of the second segment 42, thereby forming an insulating base 40 with a high rating.

[0055] This high-rated insulating base 40 is interposed between the back surface of the load-side terminal 5 of the circuit breaker 2 and the mounting panel 1, and the three high-rated studs 7 connected to the load-side terminal 5 of the circuit breaker 2 are inserted into the stud insulating parts 46a to 46c, so that the stud insulating parts 46a to 46c cover the outer circumference of the stud rod 7a. In addition, both ends of the spring pins 8 protruding from the outer circumference of the stud rod 7a of the high-rated studs 7 fit into either the pair of grooves 47a, 47a or the pair of grooves 47b, 47b. As a result, the high-rated studs 7 connected to the load-side terminal 5 are positioned with the stud connection part 7c facing vertically, as shown in Figure 1, and are prevented from rotating. Here, the first projection described in this invention corresponds to both ends of the spring pins 8 protruding from the outer circumference of the stud rod 7a of the high-rated studs 7, and the first recess described in this invention corresponds to the grooves 47a, 47b.

[0056] The same procedure is followed when an insulating base 40 with a higher rating is interposed between the back surface of the power supply terminal 6 side of the circuit breaker 2 and the mounting panel 1. The stud 7 with a higher rating connected to the power supply terminal 6 is positioned with the stud connection portion 7c facing in the width direction and with an anti-rotation mechanism in place, as shown in Figure 1.

[0057] By the way, since the two types of circuit breakers 2 with different ratings have the same size case 3, there is a possibility that a stud 7 with a lower rating may be mistakenly connected to the load-side terminal 5 and power-side terminal 6 of the circuit breaker 2 with a higher rating. In this case, the stud rod 7a of the stud 7 with a lower rating will fit into the stud insulation portion 46a~46 of the insulating base 40 with a higher rating, leaving a gap. Then, the stud connection portion 7c of the stud 7 with a lower rating will be set to face a predetermined direction (when connecting to the load-side terminal 5, the stud connection portion 7c will face vertically, and when connecting to the power-side terminal 6, the stud connection portion 7c will face widthwise), and the ends of the spring pin 8 protruding from the outer circumference of the stud rod 7a will be inserted into one of the grooves 47a, 47b provided in the stud insulation portion 46a~46c of the insulating base 40 with a higher rating. However, grooves 47a and 47b are located in different positions in the circumferential direction from grooves 17a and 17b into which both ends of the spring pin 8 provided on the stud 7 with a lower rating enter (see Figure 5(a)). For this reason, both ends of the spring pin 8 protruding from the outer circumference of the stud rod 7a of the stud 7 with a lower rating cannot be inserted into grooves 47a and 47b provided on the stud insulating parts 46a to 46c, and the stud 7 with a lower rating cannot be connected to the load-side terminal 5 and power supply-side terminal 6 of the circuit breaker 2 with a higher rating. Here, the second rod-shaped part described in the present invention corresponds to the stud rod 7a of the stud 7 with a lower rating, the second projection described in the present invention corresponds to both ends of the spring pin 8 protruding from the outer circumference of the stud rod 7a of the stud 7 with a lower rating, and the second recess described in the present invention corresponds to grooves 17a and 17b.

[0058] Therefore, when connecting studs 7 to the load-side terminal 5 and power-side terminal 6 of two types of circuit breakers 2 of the same size but different ratings, it is not possible to connect the studs 7 with a lower rating to the insulating base 40 with a higher rating, thus preventing the studs 7 with different ratings from being mistakenly connected.

[0059] Furthermore, the convex engagement portion 23 and concave engagement portion 24 that connect any of the first segment 41, second segment 42, and third segment 43 constituting the high-rated insulating base 40 are composed of a large convex portion 25 and a small convex portion 26 for the convex engagement portion 23, and a large concave portion 27 and a small concave portion 28 for the concave engagement portion 24. If the second segment 42 is inverted vertically, with the cylindrical portion 45b at the top and the segment base body 44a at the bottom, and an attempt is made to connect it between the first segment 41 and the third segment 43, the connection of the convex engagement portion 23 and the concave engagement portion 24 becomes impossible. Also, if the second segment 42 is inverted horizontally in Figure 14 and an attempt is made to connect it between the first segment 41 and the third segment 43, the connection of the convex engagement portions 23 to each other and the connection of the concave engagement portions 24 to each other becomes impossible. Therefore, by providing at least one of the convex engaging portion 23 and the concave engaging portion 24 on the first segment 41, the second segment 42, and the third segment 43, it is possible to prevent incorrect assembly of the first segment 41, the second segment 42, and the third segment 43.

[0060] Furthermore, although the first segment 41, which constitutes the high-rated insulating base 40 shown in Figure 14, and the first segment 20, which constitutes the low-rated insulating base 11 (load-side insulating base) shown in Figure 7, have similar external shapes, the first segment 41 is provided with a concave engagement portion 24, while the first segment 20 is provided with a convex engagement portion 23.

[0061] Similarly, the second segment 42 of the insulating base 40 and the second segment 21 of the insulating base 11 have similar external shapes, but the convex engaging portion 23 and the concave engaging portion 24 are located on opposite sides. Furthermore, the third segment 44 of the insulating base 40 and the third segment 22 of the insulating base 11 also have similar external shapes, but the third segment 43 is provided with a convex engaging portion 23, while the third segment 22 is provided with a concave engaging portion 24.

[0062] As a result, it is impossible to connect parts of the first to third divisions 43 of the high-rated insulating base 40 with parts of the first to third divisions 20 of the low-rated insulating base 11, thus preventing misassembly of the high-rated insulating base 40 and the low-rated insulating base 11.

[0063] In Figures 13 and 14, a 3-pole circuit breaker 2 was described as a specific example of two types of circuit breakers 2 with the same size but different ratings for case 3. However, similar effects can be obtained by applying it to a 2-pole circuit breaker 29 and a 4-pole circuit breaker 33. [Explanation of Symbols]

[0064] 1. Mounting panel 1a Mounting hole 2. Rear-mounted type 3-pole circuit breaker 3 cases 4 handles 5 Load side terminal 5R R phase load side terminal 5S S phase load side terminal 5T T phase load side terminal 6 Power side terminal 7 studs 7a Stud rod 7b Screw hole 7c stud connection 7d,7e Through hole 8 Spring Pins 9 terminal screws 10 Fixing screws 11. Load-side isolation base for 3-pole connectors (isolation base with a lower rating) 12 Power supply side isolation base for 3-pin connectors 13 Base Unit 13a, 13b, 13c Split base body 14a~14c Cylindrical section 15a~15c Stud insulation 16 fixing screw insertion holes 17a,17b Groove 20 1st division body 21 Second division body 21A,21B 2nd division body 22 Third division body 23 Convex engagement part 24 Recessed engagement part 25 Large protrusions 25a,26a Arms 25b, 26b Convex part 26 Small protrusion 27 Large recess 27a, 28a Arm insertion area 27b, 28b recess 28 Small recess 29. Rear-mounted type 2-pole circuit breaker 30 Load-side isolation base for 2 poles 31 Power supply side isolation base for 2 poles 33. Rear-mounted type 4-pole circuit breaker 34 Load-side isolation base for 4 poles 35 4-pole power supply side isolation base 40. Insulating base with high rating 41 1st division body 42 Second division body 43 Third division body 44a~44c Split base body 45a~45c Cylindrical section 46a~46c Stud insulation 47a,47b Groove

Claims

1. An insulating base for a circuit breaker, which is positioned between the back surface of a circuit breaker of the rear-connection type (2-pole, 3-pole, or 4-pole) and the mounting panel, and which insulates the mounting panel from a plurality of studs that are connected to the terminals of the circuit breaker and protrude inward from the back surface, It can be used in common with any of the two-pole, three-pole, and four-pole circuit breakers, and is composed of multiple divided bodies arranged in the width direction of the circuit breaker, each having multiple studs protruding from it. An insulating base for a circuit breaker, characterized in that a plurality of the divided bodies have a stud insulating portion formed in a cylindrical space that covers the outer circumference of the rod-shaped portion of the stud.

2. The plurality of divisions consist of a first division, a second division, and a third division arranged sequentially in the width direction of the circuit breaker when used in the three-pole circuit breaker in which the three studs protrude. When used in the two-pole circuit breaker in which the two studs protrude, the plurality of divisions consist of the first division and the third division arranged in the width direction of the circuit breaker. The insulating base for a circuit breaker according to claim 1, characterized in that when used in the circuit breaker for four poles in which the four studs protrude, the plurality of divisions consist of a first division, two second divisions, and a third division arranged in order in the width direction of the circuit breaker.

3. The adjacent segments of the circuit breaker in the width direction can be connected at the segment connection portion. The insulating base for a circuit breaker according to claim 2, characterized in that the segmented connecting portion has an assembly error prevention function which allows the segmented parts to be connected when adjacent segmented parts are arranged in the correct orientation, and prevents the segmented parts from being connected when adjacent segmented parts are not arranged in the correct orientation.

4. In the circuit breaker with the same number of poles, it has a first insulating base that insulates the stud with a higher rating from the mounting panel, and a second insulating base that insulates the stud with a lower rating from the mounting panel. The first insulating base and the second insulating base are composed of a plurality of the divided parts having the same shape. The plurality of divided bodies constituting the first insulating base have a first stud insulating portion formed in a cylindrical space that covers the first rod-shaped portion of the stud with a high rating, and a first recess formed on the inner surface of the first stud insulating portion into which the first projection protruding from the outer circumference of the rod-shaped portion of the stud with a high rating fits, The insulating base for a circuit breaker according to any one of claims 1 to 3, characterized in that the plurality of divided bodies constituting the second insulating base have a second stud insulating portion formed in a cylindrical space that covers the second rod-shaped portion of the stud with a small rating, and a second recess formed on the inner surface of the second stud insulating portion, at a circumferential position different from the first projection, into which the second projection protruding from the outer circumference of the second rod-shaped portion of the stud with a small rating fits.

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