Handle locking device and circuit breaker

Abstract

The handle locking device for circuit breakers according to this disclosure has a structure that prevents the handle from being locked if the movable contacts and fixed contacts of the circuit breaker are welded together, and can satisfy the isolation function that could not be achieved with conventional handle locking devices. [Solution] The circuit breaker includes a handle cover portion 10a that rotatably houses the handle 11 between the off position and the trip position, and a handle restricting portion 10b that penetrates the handle cover portion 10a and fixes the handle 11. The position of the handle cover portion 10a through which the handle restricting portion 10b penetrates is provided at the location where the handle 11 is located when the fixed contact 4 and the movable contact 6 of the circuit breaker 100 are welded together between the off position and the trip position. Since the handle restricting portion 10b cannot be inserted when the handle 11 is in the welded position, the isolation function can be satisfied.

Description

Technical Field

[0001] The present disclosure relates to a handle locking device for a circuit breaker that cannot lock the handle when the contacts are in a welded state.

Background Art

[0002] The handle lock used in conventional inexpensive circuit breakers has a structure that locks the opening and closing operation of the circuit breaker by press-fitting a handle cover onto the handle portion of the circuit breaker to lock the movement of the handle. (See, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in this method, the handle can be locked even when the moving contact of the circuit breaker is welded to the fixed contact. Therefore, an isolation function recommended by the circuit breaker standard, that is, a function of being able to lock only when the main contact is in the OFF position, cannot be satisfied.

[0005] The handle locking device for a circuit breaker according to the present disclosure is made to solve the above problems, and an object thereof is to satisfy the isolation function by adopting a structure that cannot lock the handle when the moving contact and the fixed contact of the circuit breaker are welded.

Means for Solving the Problems

[0006] A handle locking device for restraining a handle when attached to a circuit breaker according to the present disclosure comprises a handle cover portion that rotatably accommodates the handle between an off position and a trip position, and a handle restricting portion that penetrates the handle cover portion and fixes the handle, wherein the position of the handle cover portion through which the handle restricting portion penetrates is provided at the location where the handle is positioned when the contacts of the circuit breaker are welded together between the off position and the trip position. [Effects of the Invention]

[0007] The circuit breaker handle locking device according to this disclosure has a structure that prevents the handle from being locked if the movable contacts and fixed contacts of the circuit breaker are welded together, and can satisfy the isolation function that could not be achieved with conventional handle locking devices. [Brief explanation of the drawing]

[0008] [Figure 1] This is a front view showing the cut positions of the cross-sectional views in Figures 3 to 8 in Embodiment 1. [Figure 2] This is a perspective view showing the handle lock device in Embodiment 1 with a padlock attached. [Figure 3] This figure shows a circuit breaker in the off state with the handle lock device installed in Embodiment 1, and is a cross-sectional view taken along the arrow AA shown in Figure 1. [Figure 4] This figure shows a circuit breaker in the OFF state in Embodiment 1, and is a cross-sectional view of BB as indicated by the arrow in Figure 1. [Figure 5] Figure 4 shows the relationship between the push plate and the link, and is a cross-sectional view taken along the arrow CC shown in Figure 1. [Figure 6] This figure shows a circuit breaker in the ON state in Embodiment 1, and is a cross-sectional view of BB as indicated by the arrow in Figure 1. [Figure 7] This figure shows a circuit breaker in the tripped state after contact welding in Embodiment 1, and is a cross-sectional view of BB as shown by the arrow in Figure 1. [Figure 8]This diagram shows the relationship between the push plate and the link when the handle is moved in the off direction after contact welding, and is a cross-sectional view taken along the arrow CC shown in Figure 1. [Figure 9] This is a perspective view showing the steering wheel lock device in Embodiment 1 installed. [Figure 10] This figure shows the steering wheel lock device in Embodiment 1, where (a) is a left side view, (b) is a front view, and (c) is a right side view. [Figure 11] This is a perspective view of the steering wheel locking device in Embodiment 1, with the steering wheel restricting portion extended. [Figure 12] This is a perspective view of the steering lock device in Embodiment 1, seen from the bottom side, where (a) shows the steering restrictor extended and (b) shows the steering restrictor inserted. [Figure 13] This figure shows the handle lock device in Embodiment 1 attached to a circuit breaker in the tripped state after contact welding, and is a cross-sectional view taken along the arrow AA shown in Figure 1. [Figure 14] In Embodiment 1, the diagram shows the handle portion with the handle restricting part inserted in the off state, and is a cross-sectional view taken along the arrow DD shown in Figure 13. [Figure 15] In Embodiment 1, the diagram shows the handle portion with the handle restrictor inserted when the handle position in the OFF state is shifted in the ON direction, and is a cross-sectional view taken along the arrow DD shown in Figure 13. [Figure 16] In Embodiment 1, the diagram shows the handle portion with the handle restricting part inserted in a contact-welded state, and is a cross-sectional view taken along the arrow DD shown in Figure 13. [Figure 17] This is a table summarizing the status of each circuit breaker and whether or not the handle restrictor can be inserted in Embodiment 1. [Figure 18] This is a view from the bottom of the steering wheel locking device in Embodiment 1, showing the steering wheel restricting part installed with its front and back reversed. [Modes for carrying out the invention]

[0009] Embodiment 1 The circuit breaker according to this embodiment will be described. FIG. 1 is a front view showing the cut positions of the cross-sectional views of FIGS. 3 to 8 in Embodiment 1. In FIGS. 3 to 8, parts such as padlocks are not shown for ease of explanation. FIG. 2 is a perspective view showing the state where a padlock is applied to the handle lock device in Embodiment 1. FIG. 3 is a view showing the circuit breaker in the off state with the handle lock device mounted, which is a cross-sectional view taken along the arrow A-A shown in FIG. 1. FIG. 4 is a view showing the circuit breaker in the off state, which is a cross-sectional view taken along the arrow B-B shown in FIG. 1. FIG. 5 is a view showing the relationship between the push plate and the link in FIG. 4, which is a cross-sectional view taken along the arrow C-C shown in FIG. 1, and parts unnecessary for the explanation are not shown. FIG. 6 is a view showing the circuit breaker in the on state, which is a cross-sectional view taken along the arrow B-B shown in FIG. 1.

[0010] FIG. 7 is a view showing the circuit breaker in the trip state after contact welding in Embodiment 1, which is a cross-sectional view taken along the arrow B-B shown in FIG. 1. FIG. 8 is a view showing the relationship between the push plate and the link when the handle is moved in the off direction after contact welding, which is a cross-sectional view taken along the arrow C-C shown in FIG. 1, and parts unnecessary for the explanation are not shown. FIG. 9 is a perspective view showing the state where the handle lock device is mounted in Embodiment 1. FIG. 10 is a view showing the handle lock device in Embodiment 1, where (a) is a left side view, (b) is a front view, and (c) is a right side view. FIG. 11 is a perspective view showing the state where the handle restriction part is pulled out in the handle lock device in Embodiment 1. FIG. 12 is a perspective view seen from the bottom side of the handle lock device in Embodiment 1 (a perspective view from the L direction in FIG. 11), where (a) is the state where the handle restriction part is pulled out and (b) is the state where the handle restriction part is inserted. FIG. 13 is a view showing the state where the handle lock device is mounted on the circuit breaker in the trip state after contact welding, which is a cross-sectional view taken along the arrow A-A shown in FIG. 1. In FIG. 13, the positions of the arrows D-D in FIGS. 14 to 16 are also being explained, but the handle positions in FIGS. 14 to 16 are different from each other.

[0011] FIG. 14 is a cross-sectional view taken along the arrow D-D shown in FIG. 13, showing the handle portion with the handle restriction portion inserted in the off state in Embodiment 1. FIG. 15 is a cross-sectional view taken along the arrow D-D shown in FIG. 13, showing the handle portion with the handle restriction portion inserted in a state where the handle position in the off state is shifted in the on direction in Embodiment 1. FIG. 16 is a cross-sectional view taken along the arrow D-D shown in FIG. 13, showing the handle portion with the handle restriction portion inserted in the contact welding state in Embodiment 1. FIG. 17 is a table summarizing the states of each circuit breaker and the insertability of the handle restriction portion in Embodiment 1. FIG. 18 is a view of the handle lock device in Embodiment 1 as seen from the bottom side in a state where the front and back of the handle restriction portion are attached in reverse.

[0012] As shown in FIG. 1, the handle lock device 10 is attached to the cover 2 of the circuit breaker 100. Further, as shown in FIG. 2, by applying the padlock 13, the handle lock device 10 cannot be removed from the circuit breaker 100. By applying the padlock 13, the circuit breaker 100 cannot be operated from the off state to the on state, and unintended on operations can be prevented. Here, as shown in FIG. 3, the handle lock device 10 is fixed to the inner surface of the opening 2a of the cover 2. First, the circuit breaker 100, which is the installation target of the handle lock device 10, will be described.

[0013] The structure of the circuit breaker 100 will be described using FIGS. 4 to 7. As shown in FIG. 4, the circuit breaker 100 includes a housing 3 composed of a base 1 and a cover 2 formed of an insulating material such as plastic. The housing 3 is provided with a fixed contact conductor 5 to which an external power supply wire on the supply side is connected in the upward direction on the paper surface of the X-axis in FIG. 4, and a load side terminal 17 to which an external power supply wire on the load side is connected in the downward direction on the paper surface of the X-axis in FIG. 4. The handle 11 is formed of an insulating material and is provided with a handle shaft 11a (FIG. 3) that serves as a shaft for rotating the handle 11 and a handle hole 11b into which the handle restriction portion 10b is inserted.

[0014] The fixed contact conductor 5 is equipped with a fixed contact 4. The movable contact conductor 7 is equipped with a movable contact 6 fixed at one end and the other end is fixed to the base 1. The fixed contact conductor 5 and the movable contact conductor 7 are arranged so that the fixed contact 4 and the movable contact 6 are located within the arc extinguishing chamber 16. The movable contact 6 is constantly biased away from the fixed contact 4 by the elastic force of the bent portion 7a of the movable contact conductor 7.

[0015] The mechanism 8 includes a frame 12 (Figure 4) that operably holds the trip bar 9 and handle 11, the trip bar 9 (Figure 4), the push plate 18 (Figure 4), a link 20 (Figure 5) and link pin 21 (Figure 5) that transmit the operation of the handle 11 to the push plate 18, a latch (not shown), a handle spring (not shown), and a trip button (not shown) for testing whether the trip operation works correctly. The movable contact conductor 7 passes through a hole in the push plate 18, and the push plate 18 moves in the left-right direction of the Y axis in Figure 4 in synchronization with the movable contact conductor 7. As shown in Figure 4, when the circuit breaker 100 is in the off state, the elastic force of the bent portion 7a of the movable contact conductor 7 separates the fixed contact 4 and the movable contact 6, and the circuit breaker 100 becomes non-conductive. At this point, the push plate 18 and handle 11 are also held in the off position in conjunction with the movable contact conductor 7.

[0016] Next, we will describe the thermal relay unit 15 for interrupting the current when tripping, as shown in Figure 4. The thermal relay unit 15 is equipped with a bimetallic strip 15a made by bonding together metals with different coefficients of thermal expansion. The bimetallic strip 15a has a metal with a small coefficient of thermal expansion on the side facing the trip bar 9 and a metal with a large coefficient of thermal expansion on the opposite side. This allows it to bend due to the difference in thermal expansion when heat is generated by a current exceeding a predetermined value, such as a short-circuit current or overcurrent. The bimetallic strip 15a is positioned so that it can push the trip bar 9 when bent.

[0017] Next, the operation of the circuit breaker 100 will be explained. First, the off operation of the circuit breaker 100 shown in Figure 4 will be explained. By operating the handle 11 so that the tip of the handle 11 points downwards in the plane of the paper along the X axis, the movable contact conductor 7 and the movable contact 6 are lifted, the fixed contact 4 and the movable contact 6 separate, and the circuit breaker 100 loses its conductivity. In this off operation, the fixed contact 4 and the movable contact 6 are held in a separated state.

[0018] As shown in Figure 5, the handle 11 and the link 20 are connected by a link pin 21. In the off state, the elastic force of the bent portion 7a of the movable contact conductor 7 pushes the press plate 18 to the right in the plane of the Y axis, and the press plate 18 and the pressing portion 22 of the link 20 also push the link 20 to the right in the plane of the Y axis. As the link 20 is pushed to the right in the plane of the Y axis, the tip of the handle 11 points downward in the plane of the X axis.

[0019] Next, the ON operation of the circuit breaker 100 will be explained. By operating the handle 11 shown in Figure 5 so that the tip of the handle 11 points upward in the plane of the paper along the X-axis, the link 20 pushes the push plate 18 to the left in the plane of the paper along the Y-axis. The push plate 18 pushes the movable contact conductor 7 and the movable contact 6 toward the fixed contact 4 (to the left along the Y-axis in Figure 5), overcoming the elastic force of the bent portion 7a of the movable contact conductor 7, causing the fixed contact 4 and the movable contact 6 to come into contact and the circuit breaker 100 to become electrically conductive (Figure 6). In this ON operation, the trip bar 9 in the mechanism 8 engages with a latch (not shown), and the fixed contact 4 and the movable contact 6 are held in contact.

[0020] Furthermore, as shown in Figure 5, in the ON operation, the link 20 contacts the right-side surface of the Y-axis plane of the push plate 18 at the push portion 22, allowing the push plate 18 to be pushed in the left-side direction of the Y-axis plane.

[0021] The tripping operation of the circuit breaker 100 will now be explained. When a current exceeding a predetermined value, such as a short-circuit current or overcurrent, flows through the circuit breaker 100 in the ON state shown in Figure 6, the bimetal 15a of the thermal relay unit 15 operates, pushing the trip bar 9 provided in the mechanism unit 8. This disengages the engagement within the mechanism unit 8, and the movable contact 6 separates from the fixed contact 4 due to the elastic force of the bent portion 7a of the movable contact conductor 7, interrupting the current flowing through the circuit breaker 100. The handle 11 is positioned between the OFF position shown in Figure 4 and the ON state shown in Figure 6 due to the elastic force of the bent portion 7a of the movable contact conductor 7 and the load of a handle spring (not shown) attached to the handle 11.

[0022] Figure 7 describes the state in which the fixed contact 4 and movable contact 6 of the circuit breaker 100 are welded together. First, the fixed contact 4 and movable contact 6 are welded together. After the fixed contact 4 and movable contact 6 are welded together, if the thermal relay unit 15 is activated or if the trip button (not shown) is pressed, the movable contact 6, movable contact conductor 7, and push plate 18 are in the ON state, but the handle 11 is in the tripped state. The reason for this will be explained later in Figure 8.

[0023] As shown in Figure 8, when the fixed contact 4 and the movable contact 6 are welded together, turning the handle 11 in the direction of arrow J (off direction) causes the link 20 to move in the direction of arrow K, and the link 20 and the push plate 18 separate. Therefore, as mentioned above, if the thermal relay unit 15 is activated or the trip button (not shown) is pressed after the fixed contact 4 and the movable contact 6 have been welded together, the push plate 18 and the link 20 separate. As a result, the movable contact 6, the movable contact conductor 7, and the push plate 18 remain in the ON state, but the handle 11 is in the tripped state. The reason the handle 11 is in the tripped state is that after manually moving the handle 11 in the OFF direction and then releasing it, the load of the handle spring (not shown) returns it to the tripped position.

[0024] The handle lock device 10 according to this embodiment is attached to the circuit breaker 100 configured in this way as shown in Figure 9. The handle lock device 10 is composed of two members, as shown in Figures 10(a) to (c) and Figure 11, and consists of a handle cover portion 10a that covers the handle 11 and restricts the movement of the handle 11, and a handle restricting portion 10b that is attached to the handle cover portion 10a and connects the two parts, the handle 11 and the handle cover portion 10a, thereby restricting the movement of the handle 11.

[0025] As shown in Figure 12(a), the handle cover portion 10a includes a contact surface 10a1 against which the tripped handle 11 abuts and positions the tripped handle 11; an insertion side surface 10a2 provided perpendicular to one end of the contact surface 10a1 and having an insertion hole 10a5 into which the handle restricting portion 10b described later is inserted; and a fixed side surface 10a3 provided perpendicular to the other end of the contact surface 10a1 and facing the insertion side surface 10a2.

[0026] The contact surface 10a1, the insertion side surface 10a, and the fixed side surface 10a3 form a box shape surrounding the handle 11, and this box shape allows the handle 11 to rotate between the off state and the trip state.

[0027] The contact surface 10a1 is provided with a fitting projection 10a4 that engages with the opening 2a of the cover 2 when the handle cover portion 10a is attached to the cover 2. The handle cover portion 10a is fixed to the cover 2 by this fitting projection 10a4.

[0028] A retaining surface 10a10 extends from the insertion side 10a2, and the retaining surface 10a10 is provided with a padlock hole 10a6, which aligns with the through hole 10b4 of the handle restricting portion 10b after the handle restricting portion 10b has been inserted, and is a hole for passing a padlock 13 through.

[0029] Furthermore, at the bottom of the page in Figure 12(a) of the insertion hole 10a5, there is a misinsertion prevention part 10a7 to prevent the handle regulating part 10b from being installed upside down.

[0030] The upper surface of the misinsertion prevention section 10a7 forms a guide surface 10a8 in which the handle restricting section 10b is sandwiched between the misinsertion prevention section 10a7 and the contact surface 10a1, preventing the handle restricting section 10b from being inserted at an angle.

[0031] Furthermore, the fixed side surface 10a3 is provided with a fixing hole 10a9 into which the welding detection unit 10b2 enters after the handle regulating unit 10b has been inserted.

[0032] A positioning surface 10a11 is provided between the insertion hole 10a5 and the fixing hole 10a9. When the handle restricting portion 10b is inserted, the handle restricting portion 10b is sandwiched between the guide surface 10a8 and the positioning surface 10a11, preventing the handle restricting portion 10b from being inserted at an angle.

[0033] Next, as shown in Figure 12(a), the handle restricting section 10b includes a restraining section 10b1 that is inserted into the handle hole 11b of the handle 11 and restrains the handle 11, a welding detection section 10b2 that is provided parallel to the insertion direction of the handle restricting section 10b relative to the restraining section 10b1, that is, parallel to the direction of arrow M in Figure 12(a), and a guide section 10b3 provided between the restraining section 10b1 and the welding detection section 10b2.

[0034] Furthermore, as shown in Figure 12(b), the handle restricting portion 10b is provided with a through hole 10b4 that aligns with the padlock hole 10a6 when the handle restricting portion 10b is inserted, allowing the padlock 13 to pass through, and a groove 10b5 provided between the restraining portion 10b1 and the guide portion 10b3, which grips the handle 11 when the handle restricting portion 10b is inserted.

[0035] After contact welding and in the tripped state, the handle 11 inside the handle lock device 10 is as shown in Figure 13. In Figure 13, for ease of explanation, only the cover 2, handle 11, and handle lock device 10 are shown. After contact welding and in the tripped state, the handle 11 is in contact with the contact portion 19 of the contact surface 10a1. With the handle 11 in contact with the contact surface 10a1, even if one attempts to insert the handle restricting portion 10b into the handle cover portion 10a, the handle 11 is positioned where the welding detection portion 10b2 is to be inserted, making it impossible to insert the handle restricting portion 10b. More details will be described later using Figure 16.

[0036] Next, we will describe the operation of inserting the steering wheel restrictor 10b into the steering wheel cover 10a while the steering wheel 11 is covered by the steering wheel cover 10a.

[0037] First, as shown in Figure 14, when the steering wheel 11 is in the off position, the steering wheel 11 is positioned inside the steering wheel cover 10a when the steering wheel cover 10a is attached. With the steering wheel cover 10a attached, the steering wheel restrictor 10b is inserted through the insertion hole 10a5 of the steering wheel cover 10a.

[0038] Here, the insertion hole 10a5 and the fixing hole 10a9 are positioned in the P-axis direction, which is perpendicular to the rotation direction of the handle 11, i.e., the N-axis direction in Figure 14. By arranging the insertion hole 10a5 and the fixing hole 10a9 perpendicular to the rotation direction of the handle 11, it becomes easier to form the handle hole 11b, and thus easier to manufacture the handle 11. However, if the manufacturability of the handle 11 is not a consideration, the arrangement of the insertion hole 10a5 and the fixing hole 10a9 does not have to be perpendicular to the rotation direction of the handle 11.

[0039] The restraining portion 10b1 of the inserted handle restricting portion 10b is inserted into the handle hole 11b of the handle 11, restraining the handle 11 from moving. The welding detection portion 10b2 of the handle restricting portion 10b is inserted into the fixing hole 10a9 of the handle cover portion 10a. In this way, the handle restricting portion 10b penetrates the handle cover portion 10. In this state, the handle 11 is inserted into the groove portion 10b5 of the handle restricting portion 10b.

[0040] Furthermore, in this state, the padlock 13 can be passed through the padlock hole 10a6 and the through hole 10b4 (Figures 2 and 3).

[0041] The welding detection unit 10b2, inserted into the fixing hole 10a9, is surrounded by the fixing hole 10a9, thus reducing the range of free movement it can have and allowing it to hold the handle restrictor unit 10b. Holding it in place makes it less likely for the handle restrictor unit 10b to shift, making it easier to align the padlock hole 10a6 and the through hole 10b4, and thus easier to attach the padlock 13.

[0042] As shown in Figure 15, when inserting the handle restricting part 10b into the handle cover part 10a, the welding detection part 10b2 is inserted first, and the guide part 10b3 is inserted to the restricting position while absorbing the angle variation of the handle 11. In other words, if the off position of the handle 11 is shifted in the on direction, the handle 11 and the guide part 10b3 come into contact, and by shifting the handle 11 in the off direction (direction of arrow Q in Figure 15), the restraining part 10b1 can enter the handle hole 11b. This guide part 10b3 makes it possible to achieve normal insertion of the handle restricting part 10b even if the off position of the handle 11 is shifted due to assembly variations of the circuit breaker 100. If the off position of the handle 11 is shifted in the on direction and there is no guide part 10b3, the restraining part 10b1 will interfere with the handle 11, and the restraining part 10b1 cannot be inserted into the handle hole 11b.

[0043] Furthermore, the position relative to the guide portion 10b3 is not limited to between the restraint portion 10b1 and the welding detection portion 10b2, as long as the handle 11 can be restricted so that it enters the restraint portion 10b1 in the handle hole 11b when the handle 11 is shifted in the on direction from its off position.

[0044] As shown in Figure 16, when the handle 11 is in the tripped state after contact welding, even if an attempt is made to insert the handle restrictor 10b into the handle cover 10a, the handle 11 is located in the position where the welding detection unit 10b2 is about to be inserted. In this state, the welding detection unit 10b2 provided on the handle 11 comes into contact with the handle 11, making it impossible to insert the handle restrictor 10b into the handle cover 10a. Thus, the positions of the insertion hole 10a5 and the fixing hole 10a9 of the handle cover 10a through which the handle restrictor 10b passes are located at the position where the handle 11 is located when the fixed contact 4 and movable contact 6 of the circuit breaker 100 are welded together between the off position and the tripped position.

[0045] These conditions can be summarized as shown in Figure 17. To elaborate on the contact welding state (handle off state), if contact welding occurs with the handle cover part 10a installed, it is not possible to touch the handle 11 even if one tries to operate it, and therefore it cannot be put into the off state. Also, even if one tries to attach the handle cover part 10a after contact welding, the handle 11 is in the on state or trip state, and therefore it cannot be put into the off state. As a result, the handle restrictor part 10b cannot be inserted into the handle cover part.

[0046] According to this embodiment, the handle lock device 10a, which is attached to the circuit breaker 100 to restrain the handle 11, comprises a handle cover portion 10a that rotatably houses the handle 11 between the off position and the trip position, and a handle restricting portion 10b that penetrates the handle cover portion 10a and fixes the handle 11. The position of the handle cover portion 10a through which the handle restricting portion 10b penetrates is provided at the location where the handle 11 is located when the fixed contact 4 and the movable contact 6 of the circuit breaker 100 are welded together between the off position and the trip position. Since the handle restricting portion 10b cannot be inserted when the handle 11 is in the welded position, the isolation function can be satisfied.

[0047] Furthermore, as shown in Figure 18, if an attempt is made to insert the steering restrictor 10b into the steering cover 10a with the steering restrictor 10b upside down, the steering restrictor 10b and the misinsertion prevention part 10a7 will interfere with each other, preventing the misinsertion of the steering restrictor 10b.

[0048] The configurations shown in the embodiments described above are examples of the content of this disclosure. The embodiments can be combined with other known technologies. Some parts of the configurations of the embodiments can be omitted or modified without departing from the gist of this disclosure. [Explanation of Symbols]

[0049] 1 Base, 2 Cover, 2a Opening, 3 Housing, 4 Fixed Contact, 5 Fixed Contact Conductor 6 Movable contact, 7 Movable contact conductor, 7a Bent section, 8 Mechanism section, 9 Trip bar 10 Handle locking device, 10a Handle cover portion, 10a1 Contact surface, 10a2 Insertion side, 10a3 Fixing side, 10a4 Fitting projection, 10a5 Insertion hole, 10a6 Padlock hole, 10a7 Misinsertion prevention section, 10a8 Guide surface, 10a9 Fixing hole, 10a10 Holding surface, 10a11 Positioning surface, 10b Handle restricting part, 10b1 Restraining part, 10b2 Weld detection section, 10b2 Guiding section, 10b4 Through hole, 10b5 Groove section, 11 Handle, 11a Handle shaft, 11b Handle hole, 12 Frame, 13 Padlock, 15 Thermal relay section, 15a Bimetal, 16 Arc extinguishing chamber, 17 Load-side terminal, 18 Push plate, 19 Contact part, 20 Link, 21 Link pin, 22 Push-in part, 100 circuit breakers.

Claims

1. In a handle locking device that restrains the handle when attached to a circuit breaker, A handle cover portion that houses the handle so that it can rotate between the off position and the trip position, The steering wheel is secured by a steering wheel regulating portion that penetrates the steering wheel cover portion, The handle locking device is characterized in that the position of the handle cover portion through which the handle restricting portion passes is provided at the location where the handle is positioned when the contacts of the circuit breaker are welded together between the off position and the trip position.

2. The aforementioned through-hole of the handle cover portion is provided with an insertion hole and a fixing hole. The insertion hole is provided at one end of the handle cover portion in a direction perpendicular to the direction in which the handle rotates. The handle lock device according to claim 1, characterized in that the fixing hole is provided at the other end of the handle cover portion in a direction perpendicular to the direction in which the handle rotates.

3. The handle locking device according to claim 2, wherein the handle restricting portion comprises a restraining portion, and the handle is fixed when the circuit breaker is in the off state by the restraining portion being inserted into the handle.

4. The handle locking device according to claim 3, wherein the handle restricting portion includes an enticing portion, and even when the handle is moving from the off state to the on state, the handle is moved in the off state direction and the restraining portion is inserted into the handle.

5. The steering wheel lock device according to claim 4, characterized in that the steering wheel cover portion is provided with a misinsertion prevention portion to prevent the steering wheel restricting portion from being inserted upside down.

6. A circuit breaker equipped with a handle locking device according to any one of claims 1 to 5.

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