KR100730036B1 - Load breake switch - Google Patents

Abstract

A load break switch is provided to drive a switching unit and an extinction unit by elastic force of springs compressed/expanded automatically and manually, and to reduce fabrication cost by improving an operating mechanism for driving the extinction unit. In a nozzle part for a clamp, a first port(2) and a second port(3) are fixed to a base frame(F) through first insulators(5) and second insulators(4), and the first port includes a hinge part and supports a conductor bar where an arc bar is fixed, and the second port is inserted to the front of the arc bar. An operation axis(9) crossing between the first port and the second port is supported in the base frame. The other end of an insulation bar(10) is fixed to the operation axis by intervening a link pin to the front of an operation lever. An operation apparatus(200) includes a switching unit(300) and an extinction unit(400) connected to the operation axis. The switching unit includes a mechanism connecting one end and the other end by releasing a locking state of a spring by the driving force of a motor(20) and releasing the connection between one end and the other end by releasing the locking state of a trip spring(29b). The extinction unit includes a mechanism absorbing air around the other end and injecting the absorbed air toward the other end.

Description

Load breaker switch

1 is a plan view of an embodiment according to the present invention;

2 is a side view of FIG. 1;

3 is a side view for explaining the extinguishing means of FIG.

4 is a perspective view of the switching means of FIG. 1 seen from the outside; and

5 is a perspective view of the switching means of FIG. 1 viewed from the inside;

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a load switch, and more particularly, to an operating device including an arc extinguishing mechanism of a load switch.

The load breaker is a load breaker that safely opens and closes the electric line and all the loads in order to supply high quality electricity in the power system, and when an abnormal condition such as ground fault, short circuit, overcurrent occurs in the load facility and the line, As well as all switchgear devices that ensure smooth operation and reliability of the power system in the automatic switchgear and the switchgear that turn on and off the load and no-load power safely when checking the equipment for maintenance. For example, a fuse-switch combination, which is a device that protects the system by installing a fuse that has the ability to cut off the ground short circuit and overcurrent.

These switches are capable of energizing load currents, ground faults, short circuits and overcurrents, as well as the ability to interrupt and overload overloads and rated loads, as well as the ability to apply voltage currents against ground faults, short circuits and overloads.

The load switch (power device) having the above functions includes a fixed and movable contact for opening and closing a conductor for current conduction, an arc extincition mechanism for extinguishing an electric arc, and the like. An operating mechanism that moves to have a function, and a frame that supports and configures a controller, etc. for operating and controlling all of these functions.

With the recent increase in electric power demand and the expansion of the system scale, the installation amount of ancestor equipment tends to increase further in order to supply high-quality electric power, and the operation device of the electric load switchgear which performs these load switching is reliable. High thing is demanded.

This operating device is usually driven by a motor connected to an external control unit, and can be driven manually to prepare for failure of the motor or control unit.

The power load switch is provided with a fixed contactor and a movable contactor for energizing, injecting, and interrupting load current, and are provided with extinguishing means for extinguishing arcs generated during contact and non-contact between both contacts.

The operation device of the load switch is not performed by the unified driving source (elastic force) and the switching means for contacting and non-contacting the movable contactor to the fixed contactor by the unified drive source (elastic force), so that the reliability is low, and also to be driven manually Since there is a need for a power transmission mechanism, the number of parts thereof increases, and there is a problem that the whole apparatus is enlarged.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a load switch with an operating device capable of driving the switching means and the extinguishing means by the elastic force of the springs which are compressed / tensioned automatically and manually.

In addition, the present invention not only improves the reliability of the arc extinguishing means for extinguishing the electric arc, but also improves the reliability to cut off the current interruption more easily and safely. Its purpose is to provide economics, safety and reliability.

The present invention, in order to achieve the above object, one terminal and the other terminal is fixed to the base frame through the one side insulator and the other insulator, the one side terminal is provided with a hinge portion can rotate the conductor bar fixed to the arc bar And the other terminal has a clamp combined nozzle portion formed to be able to fit with the tip of the arc bar, and the base frame has an operating shaft intersecting between one terminal and the other terminal in a clockwise direction of the operating device. The control lever is rotatably supported according to the elastic transfer force in the counterclockwise direction, and an operation lever having one end fixed to the operation shaft and the other end fixedly circumscribed to the operation shaft by the link pin on the arc bar. In the load switch which is fixed via the link pin at the front end of the load control device, the operating device includes the switching means and the extinguishing means. It is connected to the operating shaft, and the switching means is coupled to the shaft of the motor via a one-way clutch to extend the trip spring by the one-way rotational force of the drive shaft disposed perpendicular to the operating shaft, After compressing the spring for loading, the elastic force is accumulated, and then the stepped state of the compressed spring is released by the driving force of the motor to connect the other terminal and one terminal, and the drive shaft is rotated in the one direction by manual external force. And a mechanism part for releasing the connection state of the extended tripping spring to release the connection between the other terminal and the one terminal, and the extinguishing means includes the operation shaft being released by the release of the compression state of the compressed feeding spring. When rotated in one direction, the piston reverses to suck in air near the other terminal, and Is the air that by the release of the state of the step spring an elongated trip suction to the said operating shaft advances the piston when rotated in one direction to the other, which includes a mechanism for ejecting the vicinity of the other terminal.

Hereinafter, an operation apparatus of a load switch according to an embodiment of the present invention will be described with reference to FIGS. 1 to 5.

In Fig. 1, the load switch according to the present embodiment is indicated by the reference numeral 100. One side insulator 5 and the other side insulator 4 are arranged in a plurality of parallel pairs of one terminal 2 and the other terminal 3 to be electrically connected to the main circuit in the load opening device 100. It is fixed to the base frame (F) through the.

As shown in FIG. 2, each one terminal 2 has a hinge portion 6 and supports the conductor bar 7 in a rotatable manner. An arc bar 8 is fixed to the conductor bar 7. And the other terminal 3 is provided with the nozzle part N for clamp use, The said nozzle part N is formed so that it can be fitted with the front end of the arc bar 8. As shown in FIG.

In addition, as shown in FIG. 1, the base frame F is rotatably supported by an operation shaft 9 that intersects between one row of terminal 2 and the other row of terminal 3. 9, as shown in FIG. 3, an operation lever 41 having one end fixed to the operation shaft 9 and the other end of the insulation bar 10 fixed to the arc bar 8 via a link pin. ) Is fixed to the end of the cable through a link pin. The operation shaft 9 is a main component of the operation device 200 of the load switch 100 of this embodiment.

As shown in FIG. 1, the operation device 200 is provided with a switching means 300 and an extinguishing means 400 connected to the operation shaft 9.

The switching means 300 is disposed on one side of the base frame F, as shown in FIG. 1.

The switching means 300, as shown in Figures 1, 4 and 5, the motor 20; A drive shaft 21 coupled to the shaft of the motor 20 via a one-way clutch 21a and disposed perpendicular to the operation shaft 9, and having a worm screw thread 22 formed at a predetermined position; A worm wheel (23) rotatably circumscribed to a driven shaft (24) disposed parallel to the operating shaft (9) and engaged with a worm screw threaded portion (22) of the drive shaft (21); An input wheel 25 fixedly circumscribed to the driven shaft 24 and having a concave cam surface 27a formed on a part of an outer circumferential surface thereof; The intermediate part is circumscribed so as to be pivotable through a spring pressurized in one direction to the seesaw shaft 26a provided on one side of the worm wheel 23, and the rolling motion is performed along the outer circumferential surface of the feeding wheel 25. It is inserted into the cam surface (27a) by the seesaw movement to include a feed lever 26 having a feed roller 26b at the tip to transfer the driving force of the worm wheel 23 to the feed wheel (25). . In this case, when the base end of the input lever 26 comes into contact with the stopper 34 fixed to the base frame F, the input lever 26 moves in the seesaw direction in the other direction and the input roller 26b. Is separated from the cam surface 27a so that the worm wheel 23 is rotated separately from the feeding wheel 25.

In addition, one end of the switching means 300 is fixed to the operation shaft 9 so as to be articulated via a link pin 28b at the end of the link lever 28a whose base is fixedly circumscribed. The other end is fixed so that articulation is possible through the link pin 28d at the end of the link lever 28c whose base is fixedly circumscribed to the coaxial 24, and the spring 29a for coil spring is circumscribed on the outer circumferential surface. A connecting rod 28 disposed vertically with respect to the driven shaft 24 in a state where it is in a state; One end is fixed to the link pin 28d, and the other end is fixed to the pin 29 fixed to the base frame F, and includes a tripping spring 29b.

In addition, the driven shaft 24 includes a trip latch 30 in a state where the proximal end is fixedly circumscribed to the driven shaft 24 between the link lever 28c and the input wheel 25, and The other side of the worm wheel 23 is fixedly provided with an operating cam 13 rotatably circumscribed to the driven shaft 24. A portion of the outer circumferential surface of the operation cam 13 is provided with a pivot portion 13a protruding in the radial direction.

In the base frame F, the trip latch pin 31 and the closing latch pin 32b disposed in parallel with the operation shaft 9 press the clockwise or counterclockwise directions so that the grooves 31a and 32a are inclined downward. It is rotatably provided through a torsion spring.

One end of the trip latch pin 31 is fixedly circumscribed by a trip lever 37 having a tip thereof with a roller 37a for rolling along the outer circumferential surface of the operation cam 13. On the other end side of the pin 31, by selectively stepping / releasing the tip of the trip latch 30 according to the turning movement of the trip latch pin 31, the turning movement of the trip latch 30 can be restricted / restricted. The groove 31a which can be formed is formed.

In addition, the base end of the latch lever 39 is externally fixed to one end side of the input latch pin 32b, and the other end side of the input latch pin 32b is fixed to the one end side of the operation shaft 9 fixedly. The groove 32a which can limit / restrict the swinging movement of the closing latch 32 by selectively stepping / releasing the tip of the externally closed closing latch 32 according to the turning movement of the closing latch pin 31. ) Is formed.

One edge portion of the triangular input latch lever 40 is rotatably coupled to the front end of the latch lever 39 via a pin, and the other edge portion of the latch lever 40 is rotatably coupled to the other end of the latch lever 40. The roller 40b is rolled along the outer circumferential surface of the operation cam 13, and another corner of the input latch lever 40 is attached to the pin 40a fixed to the base frame F. It is rotatably circumscribed.

Further, when the base end of the main shaft lever 42 is fixedly circumscribed to the operation shaft 9, and the front end of the main shaft lever 42 is pivoted at an angle, the motor 20 Coupled with a lever 43, which is connected to an auxiliary switch 44 having a function of turning off an electric circuit connected with the motor, in accordance with a pivoting movement of the operating shaft 9, by turning off the electric circuit. Stop operation of the (20).

In addition, in order to enable disconnection between one terminal and the other terminal manually, spur gears 45A and / or 45A 'are fixedly circumscribed at the front end of the drive shaft 21, and the spur gears 45A and //. Or a manual drive shaft 48 and / or 48 ', which is parallel to the drive shaft 21, with the spur gears 45B and / or 45B' engaged with 45A 'fixedly circumferentially arranged on the base frame F. It is rotatably supported and the tip of the manual drive shaft 48 and / or 48 'is tightly fitted with one end of the remote control cable 63.

The above-described means for manually enabling the disconnection between one terminal and the other terminal is made through two spur gears, so that they can easily protrude from the load entrainer.

The remote control cable 63 is mounted on the manual drive shaft 48 and / or 48 'and the motor is driven through the remote control cable 63 and the spur gears 45A and / or 45A', 45B and / or 45B '. When the drive shaft 21 is manually rotated in the same direction as the rotational direction of the drive shaft 21 driven by the 20, the shaft of the drive shaft 21 and the motor 20 is interposed between the one-way clutch 21a. And the shaft of the motor 20 is stopped due to the coupled coupling, and only the driving shaft 21 rotates in the same direction as the rotational direction of the driving shaft 21 driven by the motor 20, so that the worm wheel 23 ) Can be rotated.

In addition, a trip lever 46 is fixedly circumscribed on the other end side of the trip latch pin 31, and power is applied to the coil 50 to the base frame F, whereby the coil becomes an electromagnet, thereby The movable iron core 50a is drawn into the fixed iron core 50b so that the trip connecting rod 50c pushes the trip lever 46 so that the trip latch pin 31 pivots.

As shown in FIG. 3, one side of the extinguishing means 400 can be distributed in the inner space A formed in the insulator 4 of each of the other terminals 3 disposed on the base frame F. FIG. The L-shaped connecting pipe 45 whose other end is protruded and disposed in the cylinder 39 so as to face the front end side of the piston 47, and one end is fixed to the base end side of the piston 47. (9) includes a piston rod (55), the other end of which is fixed to the piston lever (56) whose outer end is circumferentially coupled via a pin (1a).

The extinguishing means 400 retreats when the other terminal 3 and the one terminal 2 are connected by the above configuration, and moves forward when the one and the other terminals are disconnected so that the terminals are disconnected from each other. In order to extinguish the arc generated at the time, air formed in the space in the cylinder 39 is blown to the nozzle 6 through the connecting pipe 45 and the inner space A.

Referring to the operation of the operation device of the load switch for power configured as described above are as follows.

1. Operation for connection between one terminal and the other terminal

First, the input lever 32 is in a state of being stepped on the input latch pin 32b, and the groove 31a of the trip latch pin 31 is in a downwardly inclined state.

When the motor 20 is driven, the drive shaft 21 coupled to the shaft of the motor 20 rotates in one direction, and the worm wheel 23 is caused by the worm screw threaded portion 22 formed on the drive shaft 21. And the operation cam 13 fixed to the other side of the worm wheel 23 is rotated in one direction (clockwise in Figure 4).

When the worm wheel 23 rotates in one direction, the input lever 26 fixed to one side of the worm wheel 23 rotates in the same rotational direction as the worm wheel 23 along the outer circumferential surface of the input wheel 25, and then the input wheel The feed roller 26b of the feed lever 26 is seesawed in one direction with respect to the seesaw shaft 26a by the concave cam surface 27a of the 26, and is fed to the cam surface 27a to feed the feed wheel 25. Rotate with worm wheel (23).

When the worm wheel 23 is continuously rotated from the time when the stopper 34 and the input lever 26 are in contact with each other and the input roller 26b is separated from the cam surface 27a from the time when they rotate together, The driven shaft 24 fixedly inscribed to the input wheel 25 rotates in the same direction as the worm wheel 23, so that the trip latch 30 fixedly circumscribed to the driven shaft 24 is elastic. While hitting the groove 31a (downward inclined groove) formed in the tripping pin 31 being pressed by the torsion spring 35 in one direction, the posture 31a is changed into the upwardly inclined groove 31a. The groove 31a is rotated in the same direction as the worm wheel 23 while passing through the groove 31a, and the groove 31a is returned to its original position in the posture of the groove 31a inclined downward by the torsion spring 35 again. The link lever 28c fixedly circumscribed to the coaxial 24 is the same as the worm wheel 23. In the direction of rotation of the input spring 29a externally connected to the connecting rod 28 in cooperation with the link pin 28b on the operating shaft 9 side and the link pin 28d on the driven shaft 24 side. At the same time as the compression, the trip spring 29b is extended.

Then, when the feed roller 26b is separated from the cam surface 27a, the driven shaft 24 is driven by the force of the extended trip spring 29b and the compressed feed spring 29a. The tip of the trip latch 30 fixedly circumscribed to the driven shaft 24 while being rotated in a direction opposite to the rotational direction of 23) walks on the back of the groove 31a of the trip patch pin 31. And the trip latch 30 in a direction opposite to the rotational direction of the worm wheel 23 by the force of the extended trip spring 29b and the compressed closing spring 29a, which has not yet lost all the elastic force. And the driven shaft 24 is ready to rotate.

In this state, when the motor 20 continues to operate and the worm wheel 23 rotates, the roller 40b comes into contact with the pivot portion 13a of the operation cam 13, thereby causing the latching lever 40 to enter. As shown in FIG. 4, the latch lever 39 is rotated clockwise to switch the groove 32a of the input latch pin 32b to the upward position, and then return to the downwardly inclined position. Is rotated clockwise as seen in FIG. 4 through the groove 32a by the force of the compressed spring 29a. Accordingly, the operation shaft 9 is rotated in the clockwise direction as shown in FIG. 4, such that the operation lever 41 whose outer end is fixedly circumscribed to the operation shaft 9 is in the same direction as the operation shaft 9. It is rotated, the arc bar (8) connected to the operation lever 41 via the insulating bar 10 in a link type and the conductor bar (7) fixed to the arc bar (8) the other terminal (3) It turns to the side, the tip of the arc bar (8) is put into the nozzle for the clamp portion (N) to allow the other terminal 3 and the one terminal (2) to be connected.

In the pivoting movement of the arc bar 8 by the operating shaft 9, the piston lever 56 whose base is fixedly circumscribed on the operating shaft 9 is rotated clockwise as shown in FIG. Accordingly, the piston rod 55 and the piston 47 are reversed to suck the outside air through the nozzle part N, the inner space A, and the connection pipe 45 inside the cylinder 39.

In addition, during the pivoting movement of the arc bar 8 by the operating shaft 9, the main shaft lever 42 whose base is circumscribed on the operating shaft 9 is also rotated, and thus the main shaft lever 42. The auxiliary switch 44 connected via the lever 43 is operated to turn off the electric circuit (not shown) to stop the motor 20.

2. Operation for disconnection between one terminal and the other terminal

The drive shaft 21 mounted on the manual drive shaft 48 by the motor 20 through the remote control cable 63 and the spherical control cable 63 and the spur gears 45A, 45B or 45A ', 45B'. When the drive shaft 21 is manually rotated in the same direction as the rotational direction of the motor 20, the drive shaft 21 and the shaft of the motor 20 are coupled to each other via the one-way clutch 21a. ) Shaft is stationary, only the drive shaft 21 is rotated in the direction driven by the motor 20, so that the worm wheel 23 can be rotated in the drive direction by the drive shaft 21, the operation cam The pivot portion 13a of the 13 presses the roller 37a, thereby causing the tripping pin 31 to pivot, thereby turning the groove 31a formed in the tripping pin 31 into an upward position. After returning to the downwardly inclined position, the trip latch 30 is extended by the force of the trip spring 29b. After returning to the original position through the 32a, as a result, the operating shaft 9 also rotates counterclockwise as shown in FIG. The bar 7 is retracted to release the connection between one terminal 2 and the other terminal 3.

In addition, the piston lever 56 whose base is fixedly circumscribed to the operation shaft 9 during the pivoting movement of the arc bar 8 by the operation shaft 9 in the counterclockwise direction is seen in FIG. 3. As a result, the piston rod 55 and the piston 47 move forward to be sucked and stored in the cylinder 39 through the nozzle part N, the inner space A, and the connection pipe 45. The outside air is blown back to the nozzle part N via the connecting pipe 45 and the inner space A, thereby releasing the connection between the one terminal 2 and the other terminal 3 near the nozzle part. Arc extinguish at

In addition, for instantaneous disconnection between one terminal and the other terminal, power is applied to the trip coil 50 so that the coil becomes an electromagnet so that the movable iron core 50a inside the coil is inserted into the fixed iron core 50b. Thus, the trip connecting rod 50c pressurizes the trip lever 46, causing the trip pin 31 to pivot in the same manner as the pivot part 13a of the operating cam 13 pivots. As shown in FIG. 4, the operation shaft 9 is rotated counterclockwise, and the connection between the one terminal 2 and the other terminal 3 may be released.

In the above, the operation for connection between one terminal and the other terminal has been described as being generated by the driving force of the motor 20, but the manual drive for driving the manual drive shaft 48 as the operation for disconnection between one terminal and the other terminal is described. It is obvious to those skilled in the art that it can be generated by external force.

In the above description, it will be apparent to those skilled in the art that one terminal and the other terminal may be the power supply terminal and the load terminal, or the load terminal and the power supply terminal, respectively.

In addition, in the above description of the load switchgear, one terminal and the other terminal is paired in a plurality arranged in parallel to be in contact / non-contact by one operation device, but only one one terminal and one other terminal It will be apparent to those skilled in the art that they can be arranged in pairs and brought into contact / non-contact by one operating device.

It will be appreciated that the present invention can be embodied in other specific forms without departing from the spirit constituting its main features. Accordingly, the above examples and embodiments are to be considered in all respects as illustrative and not restrictive, and the invention is not to be limited to the above detailed description.

According to the present invention, a switching device for contacting and non-contacting a movable contactor with a fixed contactor is provided with a load switch having an operation device capable of driving the switching means and the extinguishing means by springs that are compressed / tensioned by automatic and manual. Highly reliable by means of the unified drive source (elastic force) for the means and the extinguishing means for extinguishing means, the need for a separate power transmission system to be driven manually also reduces the number of parts compared to the conventional, and also prevents the enlargement of the device as a whole Can provide an effect.

In addition, according to the present invention, the manual release means for releasing the connection between one terminal and the other terminal is provided near the tip of the drive shaft to protrude out of the base frame, so that the user is free from the movement of the components of the operation device The connection between one terminal and the other terminal can be released easily and stably.

Claims (20)

One terminal 2 and the other terminal 3 are fixed to the base frame F through the one insulator 5 and the other insulator 4, and the one terminal 2 has a hinge 6. The arc bar 8 supports the fixed conductor bar 7 so as to be rotatable, and the other terminal 3 is provided with a clamp-use nozzle portion N formed to be able to fit with the tip of the arc bar 8. There is, In the base frame F, the operation shaft 9 crossing between the one terminal 2 and the other terminal 3, according to the elastic transfer force in the clockwise / counterclockwise direction of the operating device 200, The other end of the insulating bar 10 is rotatably supported and the other end of the insulating bar 10 is fixed to the operation shaft 9, the end of which is fixed to the operation bar (9) via a link pin to the arc bar (8) In the load switchgear fixed to the front end of the lever 41 via a link pin, The operation device 200 is provided with a switching means 300 and the extinguishing means 400 connected to the operation shaft 9, The switching means 300 is coupled to the shaft of the motor 20 via a one-way clutch 21a and is tripped by a one-way rotational force of the drive shaft 21 disposed perpendicular to the operation shaft 9. The spring 29b is extended and the spring 29a is compressed to accumulate an elastic force, and then the stepped state of the compressed spring 29a is released by the driving force of the motor 20 to release the stepped state of the other terminal and one side. And a mechanism for connecting the terminal and releasing the step of the elongated trip spring 29b by rotating the drive shaft 21 in the one direction by manual external force to release the connection between the other terminal and one terminal. Doing The extinguishing means 400 sucks air near the other terminal by reversing the piston when the operation shaft 9 is rotated in one direction by releasing the compressed state of the compressed spring 29a. When the operation shaft 9 is rotated in the other direction by releasing the extended state of the trip spring (29b), the piston advances and includes a mechanism for ejecting the air sucked in the vicinity of the other terminal Load switchgear. The method of claim 1, The switching means 300 includes: a driven shaft 24 disposed parallel to the operation shaft 9 and driven by a transmission means for selectively transmitting the one-way driving force of the drive shaft 21; A connecting rod 28 having both ends linked to the driven shaft 24 and the operation shaft 9; A tripping spring (29b) having one end fixed to the base frame (F) and the other end fixed to the link portion on the driven shaft (24) side; An injection spring (29a) which is external to the connecting rod (28) and is pressurized by the link portion of the driven shaft (24) and the operating shaft (9); First step means for selectively limiting rotation of the driven shaft 24; And a second step means for selectively limiting rotation of the operating shaft (9). The method of claim 2, The transmission means includes a worm screw thread 22 formed on the drive shaft 21; A worm wheel 23 rotatably circumscribed to the driven shaft 24 and engaged with the worm screw thread 22; An input wheel 25 fixedly circumscribed to the driven shaft 24 and having a concave cam surface 27a formed on a part of an outer circumferential surface thereof; The intermediate part is circumscribed so as to be pivotable through a spring pressurized in one direction to the seesaw shaft 26a provided on one side of the worm wheel 23, and the cam surface (C) is rolled along the outer circumferential surface of the feeding wheel 25. An input lever 26 having a feed roller 26b inserted into the 27a) at its tip; And a stopper (34) in contact with the proximal end of the input lever (26) to allow the input roller (26b) to be disengaged from the cam surface (27a). The method of claim 2 or 3, The first step means A trip latch 30 whose proximal end is fixedly circumscribed to the driven shaft 24; An operating cam 13 fixed to the worm wheel 23 and rotatably circumscribed to the driven shaft 24 and having a pivot portion 13a protruding in a radial direction on a part of an outer circumferential surface thereof; A trip latch pin 31 disposed in parallel with the operation shaft 9 and rotatably supported by the base frame F; A trip lever 37 fixedly circumscribed at one end of the trip latch pin 31 and having a roller 37a at the tip thereof for rolling along the outer circumferential surface of the operation cam 13; The trip latch 30 is formed to be inclined downward on the other end side of the trip latch pin 31 according to the pivoting movement of the trip pin 31 due to the contact between the roller 37a and the pivot part 13a. A groove 31a for selectively stepping / releasing the tip of The second step means An input latch 32 whose proximal end is fixedly circumscribed to the operation shaft 9; An input latch pin 32b disposed in parallel with the operation shaft 9 and rotatably supported by the base frame F; A latch lever 39 having a proximal end fixedly circumscribed at one end of the input latch pin 32b; One corner portion is rotatably coupled to the front end of the latch lever 39 via a pin, and the other corner portion is provided with a roller 40b for rolling along the outer circumferential surface of the operation cam 13. A triangular-input latch lever 40 which is rotatably circumscribed to another pin 40a fixed to the base frame F; And it is formed to be inclined downward on the other end side of the closing latch pin (32b) in accordance with the pivoting movement of the closing latch pin (32b) by the contact between the roller (40b) and the pivot portion (13a) the closing latch (32) Load switch characterized in that it comprises a groove (32a) for selectively stepping / releasing the tip of the. The method according to any one of claims 1 to 3, The base end portion of the main shaft lever 42 is fixedly circumscribed to the operation shaft 9, and the tip end portion of the main shaft lever 42 is rotated with the motor 20 when the operation shaft 9 is pivoted at an angle. A load switch characterized in that it is coupled with a lever (43), which is connected with an auxiliary switch (44) having a function of turning off the connected electric circuit. The method of claim 4, wherein The proximal end of the main shaft lever 42 is fixedly circumscribed to the operating shaft 9, and the front end of the main shaft lever 42 is connected to the motor 20 when the operating shaft 9 is pivoted at an angle. Load switch, characterized in that coupled to the lever 43, which is connected to the auxiliary switch 44 having the function of turning off the electrical circuit. The method according to any one of claims 1 to 3, In order to enable disconnection between the other terminal and one terminal manually, a spur gear is fixedly circumscribed at the distal end of the drive shaft 21, and the spur gear meshing with the spur gear is fixedly circumscribed so that the drive shaft 21 is fixed. And a manual drive shaft (48 and / or 48 ') disposed in parallel with the beam), which is rotatably supported by the base frame (F). The method of claim 4, wherein In order to enable disconnection between the other terminal and one terminal manually, a spur gear is fixedly circumscribed at the distal end of the drive shaft 21, and the spur gear meshing with the spur gear is fixedly circumscribed so that the drive shaft 21 And a passive drive shaft (48 and / or 48 ') arranged in parallel to the support, which is rotatably supported by the base frame (F). The method of claim 5, In order to enable disconnection between the other terminal and one terminal manually, a spur gear is fixedly circumscribed at the distal end of the drive shaft 21, and the spur gear meshing with the spur gear is fixedly circumscribed so that the drive shaft 21 And a manual drive shaft (48 and / or 48 ') disposed in parallel with the beam), which is rotatably supported by the base frame (F). The method of claim 4, wherein A trip lever 46 is fixedly circumscribed on the other end side of the trip latch pin 31, and power is applied to the coil 50 to the base frame F so that the coil becomes an electromagnet, thereby moving within the coil. A load switch, characterized in that the iron core (50a) is attracted to the fixed iron core (50b) so that the trip connecting rod (50c) pushes the trip lever 46, the trip latch pin (31) is swiveling. The method of claim 5, A trip lever 46 is fixedly circumscribed on the other end side of the trip latch pin 31, and power is applied to the coil 50 to the base frame F so that the coil becomes an electromagnet, thereby moving within the coil. A load switch, characterized in that the iron core (50a) is attracted to the fixed iron core (50b) so that the trip connecting rod (50c) pushes the trip lever 46, the trip latch pin (31) is swiveling. The method of claim 6, A trip lever 46 is fixedly circumscribed on the other end side of the trip latch pin 31, and power is applied to the coil 50 to the base frame F so that the coil becomes an electromagnet, thereby moving within the coil. A load switch, characterized in that the iron core (50a) is attracted to the fixed iron core (50b) so that the trip connecting rod (50c) pushes the trip lever 46, the trip latch pin (31) is swiveling. The method of claim 7, wherein A trip lever 46 is fixedly circumscribed on the other end side of the trip latch pin 31, and power is applied to the coil 50 to the base frame F so that the coil becomes an electromagnet, thereby moving within the coil. A load switch, characterized in that the iron core (50a) is attracted to the fixed iron core (50b) so that the trip connecting rod (50c) pushes the trip lever 46, the trip latch pin (31) is swiveling. The method of claim 8, A trip lever 46 is fixedly circumscribed on the other end side of the trip latch pin 31, and power is applied to the coil 50 to the base frame F, whereby the coil becomes an electromagnet, thereby The movable iron core (50a) is attracted to the fixed iron core (50b), the trip connection rod (50c) by pushing the trip lever 46, the load latch, characterized in that the tripping pin (31) pivots. The method of claim 9, A trip lever 46 is fixedly circumscribed on the other end side of the trip latch pin 31, and power is applied to the coil 50 to the base frame F so that the coil becomes an electromagnet, thereby moving within the coil. A load switch, characterized in that the iron core (50a) is attracted to the fixed iron core (50b) so that the trip connecting rod (50c) pushes the trip lever 46, the trip latch pin (31) is swiveling. The method according to any one of claims 1 to 3, The extinguishing means 400 is inserted into the inner space A formed in the insulator 4 of the other terminal 3 disposed on the base frame F so that the upper end side of the extinguishing means 400 is displaceable. The lower end side is fixed to the L-shaped connecting pipe 45 protrudingly arranged in the cylinder 39, and one end is fixed to the proximal end of the piston 47, and the proximal end is externally fixed to the operation shaft 9. A load switch characterized in that it comprises a piston rod (55), the other end of which is coupled to the piston lever (56) via a pin (1a) to be articulated. The method of claim 4, wherein The extinguishing means 400 is inserted into the inner space A formed in the insulator 4 of the other terminal 3 disposed on the base frame F so that the upper end side of the extinguishing means 400 is displaceable. The lower end side is fixed to the L-shaped connecting pipe 45 protrudingly arranged in the cylinder 39, and one end is fixed to the proximal end of the piston 47, and the proximal end is externally fixed to the operation shaft 9. A load switch characterized in that it comprises a piston rod (55), the other end of which is coupled to the piston lever (56) via a pin (1a) to be articulated. The method of claim 5, The extinguishing means 400 is inserted into the inner space A formed in the insulator 4 of the other terminal 3 disposed on the base frame F so that the upper end side of the extinguishing means 400 is displaceable. The lower end side is fixed to the L-shaped connecting pipe 45 protrudingly arranged in the cylinder 39, and one end is fixed to the proximal end of the piston 47, and the proximal end is externally fixed to the operation shaft 9. A load switch characterized in that it comprises a piston rod (55), the other end of which is coupled to the piston lever (56) via a pin (1a) to be articulated. The method of claim 7, wherein The extinguishing means 400 is inserted into the inner space A formed in the insulator 4 of the other terminal 3 disposed on the base frame F so that the upper end side of the extinguishing means 400 is displaceable. The lower end side is fixed to the proximal end of the L-shaped connecting pipe 45 and the piston 47, the lower end of which protrudes in the cylinder 39, and the proximal end is circumferentially fixed to the operating shaft 9. Load piston, characterized in that it comprises a piston rod (55), the other end of which is coupled to the piston lever (56) via the pin (1a) to be articulated. The method of claim 10, The extinguishing means 400 is inserted into the inner space A formed in the insulator 4 of the other terminal 3 disposed on the base frame F so that the upper end side of the extinguishing means 400 is displaceable. The lower end side is fixed to the L-shaped connecting pipe 45 protrudingly arranged in the cylinder 39, and one end is fixed to the proximal end of the piston 47, and the proximal end is externally fixed to the operation shaft 9. A load switch characterized in that it comprises a piston rod (55), the other end of which is coupled to the piston lever (56) via a pin (1a) to be articulated.

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