Circuit breaker
The circuit breaker's design with a wire connecting the movable contact and crossbar stabilizes tripping by mechanically ensuring consistent activation during current-limiting interruptions, addressing delayed and unstable tripping issues.
Patent Information
- Application Number
- JP2023152511
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2023-09-20
- Publication Date
- 2025-04-02
AI Technical Summary
The pressure propagation path from the gas inlet to the pressure-receiving member in circuit breakers is often long, leading to delayed and unstable tripping actions due to varying arc energy with the phase of short-circuit current.
A circuit breaker design that includes a movable contact, crossbar, and wire, where the wire is fixed to both the movable contact and crossbar, allowing the crossbar to be pulled and rotated during current-limiting interruptions to stabilize the tripping operation.
The design stabilizes the tripping operation by ensuring consistent and timely activation of the switching mechanism through the wire's mechanical connection, reducing delays and variability.
Smart Images
Figure 2025044756000001_ABST
Abstract
Description
[Technical field]
[0001] The present invention relates to a circuit breaker. [Background technology]
[0002] Patent Document 1 discloses a technology in which, when a circuit breaker opens in a current-limiting manner due to a short circuit, the pressure in the arc extinguishing chamber increased by the arc is transmitted from a gas inlet to a pressure-receiving member, thereby activating a trip mechanism. [Prior art documents] [Patent documents]
[0003] [Patent Document 1] DE 102018211995 A1 Summary of the Invention [Problem to be solved by the invention]
[0004] If the pressure propagation path from the gas inlet to the pressure-receiving member is long, the tripping action may be delayed. In addition, since the arc energy differs depending on the phase of the short-circuit current, the pressure rise rate also changes, resulting in a problem of unstable tripping action. An object of the present invention is to stabilize the tripping operation of a circuit breaker. [Means for solving the problem]
[0005] A circuit breaker according to one aspect of the present invention includes a movable contact, a crossbar, a movable holder, and a wire. The movable contact is rotatable between a closed position and an open position. The crossbar trips an opening / closing mechanism by rotating. The movable holder holds the movable contact and is opened and closed by the opening / closing mechanism, and rotates to the open position in conjunction with the tripping of the opening / closing mechanism. The wire has one end fixed to the movable contact and the other end fixed to the crossbar, and pulls and rotates the crossbar when the movable contact opens due to a current-limiting interruption. Effect of the Invention
[0006] According to the present invention, when a current-limiting interruption occurs, the wire pulls the crossbar in conjunction with the movable contact to trip the switching mechanism, so that the tripping operation can be stabilized. [Brief description of the drawings]
[0007] [Figure 1] FIG. 1 illustrates a circuit breaker. [Diagram 2] FIG. 2 is a cross-sectional view of a circuit breaker. [Diagram 3] FIG. 2 shows a movable part in an on state. [Figure 4] FIG. [Diagram 5] FIG. [Figure 6] FIG. 2 is a diagram showing a movable contact and a wire. [Figure 7] FIG. 2 illustrates a cross-section of a circuit breaker in an on state. [Figure 8] FIG. 13 is a diagram showing the movable holder in an on state. [Figure 9] FIG. 13 is a diagram showing a movable part that has undergone current limiting interruption. [Figure 10] FIG. 1 is a cross-sectional view of a circuit breaker that has undergone current-limiting interruption. [Figure 11] FIG. 13 is a diagram showing the movable holder when current-limiting interruption is performed. [Figure 12] FIG. 2 shows the movable part in an off state. [Figure 13] FIG. 2 illustrates a cross-section of a circuit breaker in an off state. [Figure 14] FIG. 13 illustrates the movable holder in an off state. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0008] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that each drawing is a schematic view and may differ from the actual one. In addition, the following embodiment illustrates an apparatus and method for embodying the technical idea of the present invention, and does not specify the configuration as described below. In other words, the technical idea of the present invention can be modified in various ways within the technical scope described in the claims.
[0009] <<Embodiment>> "composition" In the following description, the three mutually orthogonal directions will be referred to as a vertical direction, a width direction, and a depth direction for the sake of convenience. FIG. 1 is a diagram showing a circuit breaker 11. Here, the circuit breaker 11 is shown as seen from one side in the vertical direction, one side in the width direction, and from the front in the depth direction. The circuit breaker 11 is also called a no-fuse breaker, and when it detects an abnormal overcurrent caused by an overload or short circuit, it automatically cuts off the circuit to protect it from damage due to the overcurrent. One side in the vertical direction is the power supply side, and the other side in the vertical direction is the load side.
[0010] First, the basic configuration of the circuit breaker 11 will be described. FIG. 2 is a cross-sectional view of the circuit breaker 11. As shown in FIG. Here, a cross section along the vertical and depth directions passing through the center of the second pole located in the center of the width direction among the three poles arranged in the width direction is shown as viewed from one side in the width direction. The circuit breaker 11 includes an arc extinguishing device 12, a fixed contact 13, a movable contact 14, an opening / closing mechanism 15, and a tripping device 16. The arc extinguishing device 12 is composed of a plurality of magnetic plates each having a V-shaped notch called a grid, and extinguishes the arc generated when the electrodes are opened by cooling, dividing, and stretching the arc.
[0011] The fixed contact 13 is a strip-shaped conductor, and has a fixed contact 21 formed on a surface facing the front in the depth direction. The movable contact 14 is a rod-shaped conductor and is supported so as to be rotatable between a closed position and an open position. When viewed from one side in the width direction, the counterclockwise direction is the closed direction and the clockwise direction is the open direction. The movable contact 14 has a movable contact 22 formed on the tip side of the surface facing the closed direction. When the movable contact 14 is in the closed position, the movable contact 22 comes into contact with the fixed contact 21 to be in a closed state, and when the movable contact 14 is in the open position, the movable contact 22 is separated from the fixed contact 21 to be in an open state. A protective cover 23 made of insulating resin is attached to the base end side of the movable contact 14. The protective cover 23 covers both sides of the movable contact 14 in the width direction and the surface facing the closed direction (FIG. 3).
[0012] The opening and closing mechanism 15 includes a crossbar 26 and a movable holder 27 . The crossbar 26 is rotatable between a reset position and a trip position, and when it rotates from the reset position to the trip position, it releases the latch mechanism and trips the opening / closing mechanism 15. The crossbar 26 is biased to the reset position by a return spring (not shown). When viewed from one side in the width direction, the counterclockwise direction is the trip direction and the clockwise direction is the reset direction. The movable holder 27 is rotatable between a closed position (closed position) and an open position (open position), and holds the movable contact 14 at the open position when it rotates from the closed position to the open position in conjunction with tripping of the opening / closing mechanism 15. When viewed from one side in the width direction, the counterclockwise direction is the closed direction, and the clockwise direction is the open direction.
[0013] When the handle 31 of the opening / closing mechanism 15 is turned on, the toggle link 32 extends against the elastic force of the tension coil spring 33, thereby rotating the movable holder 27 to the closed position. When the handle 31 of the opening / closing mechanism 15 is turned off, the toggle link 32 bends, thereby rotating the movable holder 27 to the open position. When the opening / closing mechanism 15 is tripped, the handle 31 stops at a position intermediate between on and off, and the toggle link 32 bends due to the elastic force of the tension coil spring 33, thereby rotating the movable holder 27 to the open position. The tripping device 16 is of a thermal type in which a heated bimetal bends to rotate the crossbar 26 in the tripping direction.
[0014] Next, the main configuration of the embodiment will be described. FIG. 3 is a diagram showing the movable part in the on state. Here, the movable contactor 14, the opening / closing mechanism 15, the crossbar 26, and the movable holder 27 are shown as viewed from one side in the vertical direction, one side in the width direction, and from the front in the depth direction. The movable contactor 14 and the crossbar 26 are connected by a wire 41. One end of the wire 41 is fixed to the side of the movable contactor 14 facing the rotation direction at the time of closing, and the other end is fixed to the side of the crossbar 26 facing the rotation direction at the time of tripping. The wire 41 is formed by twisting together a number of elemental wires, and is a metal wire rope having a small elongation rate and flexibility. The surface of the wire 41 is coated with a synthetic resin having a small friction coefficient and heat resistance, such as polytetrafluoroethylene (PTFE). When the wire 41 is inserted into the movable holder 27, one end of the wire 41 is fixed to the movable contactor 14 and the other end is fixed to the crossbar 26, and when the movable contactor 14 opens due to current-limiting interruption, it pulls and rotates the crossbar 26.
[0015] The movable holder 27 is formed in a generally cylindrical shape with the width direction as the axial direction, and supports the movable contact 14 so as to be rotatable within a predetermined angular range. The movable contact 14 is biased in the closing direction by a torsion coil spring. The movable holders 27 of the respective poles arranged in the width direction are connected to each other and held in a rotatable state by the housing. FIG. 4 is a diagram showing the movable holder 27. As shown in FIG. In the figure, (a) shows the movable holder 27 of the first pole located on one side of the width direction among the three poles lined up in the width direction, as viewed from one side in the vertical direction, one side in the width direction, and from the front side in the depth direction. In the figure, (b) shows the movable holder 27 of the first pole as viewed from the other side in the vertical direction, one side in the width direction, and from the front side in the depth direction. The movable holder 27 is formed with insertion holes 42, 43, and 44 through which the wire 41 is inserted.
[0016] FIG. 5 is a diagram showing the movable holder 27. As shown in FIG. FIG. 1(a) shows a cross section of the movable holder 27 of the first pole, passing through the insertion hole 42 in the vertical and depth directions, as viewed from one side in the width direction. The insertion hole 42 is a round hole larger than the diameter of the wire 41, and is formed in the approximate center of the movable holder 27 of the first pole in the width direction, with its axis extending along the plane in the vertical and depth directions. When the movable holder 27 is in the closed position, the insertion hole 42 penetrates the cylindrical wall, curved in an arc shape as viewed from the width direction, from the end surface facing the front in the depth direction to the end surface facing the other side in the vertical direction. When the movable holder 27 is in the closed position and the movable contactor 14 is in the closed position, one end of the insertion hole 42 facing the front in the depth direction is close to the movable contactor 14.
[0017] FIG. 1(b) shows a cross section of the movable holder 27 of the first pole, passing through the insertion hole 43 and the insertion hole 44 in the vertical and depth directions, as viewed from one side in the width direction. The insertion hole 43 is a circular hole larger than the diameter of the wire 41, and is formed in the inner peripheral surface of the side wall of the movable holder 27 of the first pole on the other side in the width direction, with its axis extending along the plane in the vertical and depth directions. The insertion hole 43 penetrates the movable holder 27 in the closed pole position linearly along a straight line L1 passing through the center of rotation Oh as viewed from the width direction, from an end face of the side wall facing one vertical direction to an end face facing the front in the depth direction.
[0018] The insertion hole 44 is a long hole that is larger than the diameter of the wire 41 and extends in the circumferential direction, and is formed on the other side of the width direction of the movable holder 27 of the first pole, and is formed along the vertical and depth planes. When the movable holder 27 is in the closed position, the insertion hole 44 penetrates the front cylindrical wall in the depth direction in the radial direction, and is formed in a fan shape surrounded by two straight lines L1 and L2 that extend in the radial direction as viewed from the width direction. When viewed from the width direction, the angle θ formed by the straight lines L1 and L2 corresponds to the rotation range of the movable holder 27. The rotation range of the movable holder 27 allows rotation in the opening direction beyond the open position in order to ensure a reset operation margin after current limiting interruption.
[0019] FIG. 6 is a diagram showing the movable contact 14 and the wire 41. As shown in FIG. FIG. 1A shows the movable contactor 14 and the wire 41 as viewed from one side in the vertical direction, one side in the width direction, and from the front side in the depth direction. FIG. 1B shows the movable contactor 14 and the wire 41 as viewed from the back in the depth direction. FIG. 1C shows the movable contactor 14 and the wire 41 as viewed from one side in the width direction. In order to make it easier to understand the passing position of the wire 41, the crossbar 26 and the movable holder 27 are omitted. One end of the wire 41 is fixed to the side of the protective cover 23 facing the closing direction, and is joined by brazing, for example, or a hook provided at the tip is hooked on the movable contactor 14 or the protective cover 23. The position where one end of the wire 41 is fixed is located behind the rotation center Oc of the movable contactor 14 in the depth direction and on one side in the vertical direction. When viewed from the width direction, the rotation center Oc of the movable contactor 14 and the rotation center Oh of the movable holder 27 coincide with each other. The other end of the wire 41 is not shown, but is fixed to the side of the crossbar 26 facing the tripping direction, for example by soldering or by hooking a hook at the tip of the wire 41 onto the crossbar 26. The position where the other end of the wire 41 is fixed is in front of the rotation center Ot of the crossbar 26 in the depth direction (FIG. 3). The wire 41 is set to a length such that it is taut and does not slacken when one end is fixed to the movable contact 14 and the other end is fixed to the crossbar 26.
[0020] The wire 41 is inserted through the wire guide 45 and the wire guide 46. The wire guide 45 and the wire guide 46 are cylindrical tubes made of a synthetic resin having a small friction coefficient and heat resistance, such as polytetrafluoroethylene (PTFE), and are provided in the bent section of the wire 41. A lubricant is applied to the inner peripheral surface of the wire guide 45 and the wire guide 46, which is the sliding surface of the wire. One end of the wire guide 45 is disposed deeper in the depth direction than the rotation center Oc of the movable contact 14, and is close to the other end of the insertion hole 42. The other end of the wire guide 45 is disposed deeper in the depth direction than the rotation center Oc of the movable contact 14 and on the other vertical side, and is fitted and fixed in the insertion hole 43. When the movable holder 27 is in the closed position, one end of the wire guide 45 faces approximately in one vertical direction, passes through two bends, and the other end faces approximately forward in the depth direction. The wire guide 46 is disposed in front of the rotation center Oc of the movable contact 14 in the depth direction and on the other side in the vertical direction, and is fixed to, for example, a middle cover of the housing. One end of the wire guide 46 faces substantially toward the back in the depth direction, and after one bend, the other end faces substantially toward the other side in the vertical direction.
[0021] Next, the operation of the circuit breaker 11 will be described. FIG. 7 is a cross-sectional view of the circuit breaker 11 in the ON state. Here, a cross section passing through the center of a first pole located at one end in the width direction among three poles arranged in the width direction, along the vertical and depth directions, is shown as viewed from one side in the width direction. When the circuit breaker 11 is in the on state, the movable contactor 14 is in the closed position, and the movable holder 27 is in the closed position. At this time, the wire 41 does not pull the cross bar 26, and the cross bar 26 maintains the reset position.
[0022] FIG. 8 is a diagram showing the movable holder 27 in the on state. Here, a cross section of the movable holder 27 of the first pole, passing through the insertion hole 43 and the insertion hole 44 in the vertical and depth directions, is shown as viewed from one side in the width direction. The wire 41 passes through the insertion hole 42, the wire guide 45, the insertion hole 43, the insertion hole 44, and the wire guide 46 in that order, and the passing position is constant on the other end side of the rotation center Oh. The portion of the wire 41 between the rotation center Oh and the wire guide 46 is a fixed position section Sf that extends linearly in the radial direction, and a straight line L1 is set along the fixed position section Sf when the movable holder 27 is in the closed position.
[0023] FIG. 9 is a diagram showing a movable part that has undergone current-limiting interruption. Here, the movable contact 14, the opening / closing mechanism 15, the crossbar 26, and the movable holder 27 are shown as viewed from one side in the vertical direction, one side in the width direction, and from the front in the depth direction. FIG. 10 is a cross-sectional view of the circuit breaker 11 in a current-limiting state. Here, a cross section along the vertical and depth directions passing through the center of a first pole located at one end in the width direction among three poles arranged in the width direction is shown as viewed from one side in the width direction. When a short circuit occurs, the circuit breaker 11 performs a current limiting interruption by causing the movable contact 14 to bounce up and open the contacts by electromagnetic repulsive force before the tripping device 16 trips. The principle of the generation of the electromagnetic repulsive force is that current concentration and diffusion occur at the contact point between the fixed contact 21 and the movable contact 22, and an electromagnetic repulsive force that tries to move away from each other is generated by the current flowing in the opposite direction. This electromagnetic repulsive force causes the movable contact 14 to bounce up and open the contacts. At this time, the wire 41 pulls the crossbar 26, causing the crossbar 26 to rotate to the trip position. That is, when the movable contact 14 rotates, the wire 41 transmits the motion to rotate the crossbar 26.
[0024] FIG. 11 is a diagram showing movable holder 27 when current-limiting interruption is performed. Here, a cross section of the movable holder 27 of the first pole, taken along the vertical and depth directions through the insertion holes 43 and 44, is shown as viewed from one side in the width direction. Immediately after current-limiting interruption, only the movable contactor 14 rotates to the open position, and the movable holder 27 remains in the closed position. When the movable contactor 14 rotates to the open position, the wire 41 is pulled by the movable contactor 14 and slides inside the insertion hole 42, wire guide 45, insertion hole 43, insertion hole 44, and wire guide 46, causing the crossbar 26 to rotate to the trip position. At this point, the movable holder 27 still maintains the closed position, so there is no change in the passing position of the section from the rotation center Oh of the wire 41 to the wire guide 45.
[0025] FIG. 12 is a diagram showing the movable part in the OFF state. Here, the movable contact 14, the opening / closing mechanism 15, the crossbar 26, and the movable holder 27 are shown as viewed from one side in the vertical direction, one side in the width direction, and from the front in the depth direction. FIG. 13 is a cross-sectional view of the circuit breaker 11 in the OFF state. Here, a cross section along the vertical and depth directions passing through the center of a first pole located at one end in the width direction among three poles arranged in the width direction is shown as viewed from one side in the width direction. When the crossbar 26 rotates to the trip position, the latch mechanism is released, tripping the opening / closing mechanism 15, and the movable holder 27 rotates to the open position. As a result, the movable holder 27 prevents the movable contact 14 from returning to the close position, and holds the movable contact 14 in the open position. At this time, the wire 41 pushes the crossbar 26 to the reset position, and the crossbar 26 rotates to the reset position by a return spring (not shown), and the wire 41 is pulled to the position shown in FIG. 13. When the handle 31 is operated from an intermediate position between on and off to the off position, the latch mechanism engages with the opening / closing mechanism 15, and the reset is completed and the switch is in the off state.
[0026] FIG. 14 is a diagram showing the movable holder 27 in the OFF state. Here, a cross section of the movable holder 27 of the first pole, passing through the insertion holes 43 and 44 in the vertical and depth directions, is shown as viewed from one side in the width direction. When the movable holder 27 is in the open position, the section from the rotation center Oh of the wire 41 to the wire guide 45 is non-parallel to the fixed position section Sf as viewed from the width direction. The straight line L2 is set along the fixed position section Sf when the movable holder 27 is rotated to a reset position equal to or higher than the open position by a reset operation after current-limiting interruption. Therefore, when the movable holder 27 returns to the open position after the reset operation, the straight line L2 becomes non-parallel to the fixed position section Sf.
[0027] <Action and Effect> Next, main effects of the embodiment will be described. The circuit breaker 11 includes a movable contact 14, a crossbar 26, a movable holder 27, and a wire 41. The movable contact 14 is rotatable between a closed position and an open position. The crossbar 26 trips the switching mechanism 15 by rotating. The movable holder 27 holds the movable contact 14, is opened and closed by the switching mechanism 15, and rotates to the open position in conjunction with the tripping of the switching mechanism 15. One end of the wire 41 is fixed to the movable contact 14 and the other end is fixed to the crossbar 26. When the movable contact 14 opens due to a current-limiting interruption, the wire 41 pulls the crossbar 26 to rotate it. In this way, when a current-limiting interruption is performed, the wire 41 pulls the crossbar 26 in conjunction with the movable contact 14 to trip the switching mechanism 15, so that the tripping operation can be stabilized.
[0028] One end of the wire 41 is fixed to the side of the movable contact 14 that faces the rotation direction when the contact is closed. This makes it possible to pull the other end of the wire 41 in conjunction with the rotation of the movable contact 14 in the opening direction when a current-limiting interruption is performed. The other end of the wire 41 is fixed to the side of the crossbar 26 facing the rotation direction at the time of tripping. This allows the crossbar 26 to rotate in the tripping direction by pulling the other end of the wire 41. The movable holder 27 is formed with an insertion hole 44 through which the wire 41 is inserted. The insertion hole 44 is formed in a fan shape surrounded by straight lines L1 and L2 along the radial direction when viewed from the axial direction of the movable holder 27. This makes it possible to avoid interference with the wire 41 when the movable holder 27 rotates.
[0029] When viewed from the axial direction of the movable holder 27, the angle θ between the straight lines L1 and L2 of the insertion hole 44 corresponds to the rotation range of the movable holder 27. This makes it possible to prevent the movable holder 27 from interfering with the wire 41 and pulling the other end of the wire 41 when the movable holder 27 rotates. The wire 41 is made of metal. Therefore, it has high mechanical strength and can transmit power reliably. The surface of the wire 41 is resin-coated. This reduces frictional resistance when the wire 41 slides, and allows for smooth transmission of power. The wire guide 45 and the wire guide 46 are provided to guide the wire 41 in a slidable state. This allows the wire 41 to slide smoothly. The wire guide 45 and the wire guide 46 are provided in the bent section of the wire 41. This allows the wire 41 to pass through a limited gap, improving the degree of freedom in layout. A lubricant is applied to the sliding surfaces of the wire guides 45 and 46 against which the wire 41 slides. This can reduce frictional resistance when the wire 41 slides.
[0030] Next, a comparative example will be described. In the comparative example, the trip mechanism is operated by utilizing the pressure in the arc extinguishing chamber. That is, when the circuit breaker opens in a current-limiting manner due to a short circuit, the pressure in the arc extinguishing chamber, which has risen due to the arc, is transmitted from the gas inlet to the pressure-receiving member, thereby operating the trip mechanism. However, if the pressure transmission path from the gas inlet to the pressure-receiving member is long, the trip operation may be delayed. In addition, since the arc energy differs depending on the phase of the short-circuit current, the pressure rise speed also changes, resulting in a problem of unstable trip operation.
[0031] <<Variation>> In the embodiment, the wire 41 is provided to the first pole located on one side of the width direction among the three poles arranged in the width direction, but the present invention is not limited to this. The wire 41 may be provided to all of the three poles arranged in the width direction. In the embodiment, the circuit breaker 11 has been described with the number of poles being three, but the present invention is not limited to this and may be applied to a circuit breaker with the number of poles being two or four. In the embodiment, a configuration has been described in which one end of the wire 41 is fixed to the movable contact 14 via the protective cover 23, but the present invention is not limited to this. That is, one end of the wire 41 may be directly fixed to the movable contact 14.
[0032] Although the present invention has been described above with reference to a limited number of embodiments, the scope of the invention is not limited thereto, and modifications of the embodiments based on the above disclosure will be obvious to those skilled in the art. [Explanation of symbols]
[0033] 11...circuit breaker, 12...arc extinguishing device, 13...fixed contact, 14...movable contact, 15...opening / closing mechanism, 16...device, 21...fixed contact, 22...movable contact, 23...protective cover, 26...crossbar, 27...movable holder, 31...handle, 32...toggle link, 33...tension coil spring, 41...wire, 42...insertion hole, 43...insertion hole, 44...insertion hole, 45...wire guide, 46...wire guide
Claims
1. a movable contact that is rotatable between a closed position and an open position; A crossbar that rotates to trip the opening / closing mechanism; a movable holder that holds the movable contact, is opened and closed by the opening and closing mechanism, and rotates to an open position in conjunction with a trip of the opening and closing mechanism; and a wire having one end fixed to the movable contact and the other end fixed to the crossbar, which pulls and rotates the crossbar when the movable contact opens by a current-limiting interruption.
2. 2. The circuit breaker according to claim 1, wherein one end of the wire is fixed to a side of the movable contactor facing a rotation direction when the contact is closed.
3. The circuit breaker according to claim 1 , wherein the other end of the wire is fixed to a side of the crossbar facing a direction of rotation at the time of tripping.
4. The movable holder has an insertion hole through which the wire is inserted, The circuit breaker according to claim 1, wherein the insertion hole is formed in a sector shape surrounded by two straight lines extending in a radial direction when viewed in an axial direction of the movable holder.
5. 5. The circuit breaker according to claim 4, wherein an angle between the two straight lines of the insertion hole when viewed from an axial direction of the movable holder corresponds to a rotation range of the movable holder.
6. 2. The circuit breaker according to claim 1, wherein the wire is made of metal and has a surface coated with resin.
7. The circuit breaker according to claim 1 , further comprising a wire guide for slidably guiding the wire.
8. 8. The circuit breaker of claim 7, wherein the wire guide is provided at a bent section of the wire.
9. The circuit breaker according to claim 7, wherein the wire guide has a sliding surface for the wire that is coated with a lubricant.
Citation Information
Patent Citations
Pressure release for an electrical switch and electrical switches with such a pressure release
DE102018211995A1