JP3246569B2 - Interlocking device for tripping mechanism of connected circuit breaker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker in which two circuit breakers such as a wiring breaker are connected, and more particularly to a device for interlocking the operation of tripping mechanisms of each circuit breaker.

[0002]

2. Description of the Related Art In general, a tripping mechanism of a circuit breaker such as a circuit breaker for wiring is generally operated by driving a trip crossbar with an overcurrent tripping device to disengage a claw from a latch receiver. Unlock the latch by the catch,
The action of the opening / closing spring on the toggle link connecting the holder and the latch that holds the movable contact is reversed by the upward movement of the latch, and the movable contact is separated. Therefore, 2 having such a tripping mechanism
When two pole or three pole circuit breakers are connected and used as a four pole or six pole circuit breaker, the trip crossbars of two adjacent circuit breakers are connected via concentric connecting rods. If the trip crossbar is driven by the overcurrent trip device when the fault current flows to one circuit breaker and the trip crossbar is connected to the other circuit breaker, the movement is immediately transmitted to the trip crossbar of the other circuit breaker. The actions are linked.

[0003]

However, in this type of conventional connection circuit breaker, two trip crossbars are integrally fixed without loosening. Therefore, when the overcurrent tripping device of one circuit breaker works, the overcurrent tripping device also drives the trip crossbar of the other circuit breaker at the same time, and the tripping load of the single circuit breaker 2
Double. As a result, there has been a problem that the conventional connection circuit breaker has a difference in operation characteristics such as an increase in trip current and operation time as compared with a single circuit breaker. SUMMARY OF THE INVENTION It is an object of the present invention to provide a trip mechanism interlocking device capable of maintaining the tripping characteristics of a connection circuit breaker in the same manner as a single circuit breaker.

[0004]

SUMMARY OF THE INVENTION To achieve the above object, the present invention connects the trip crossbars of two circuit breakers to each other via a play, and connects the play to one of the trip crossbars. Is set to be transmitted to the other after the claw and the latch receiver are disengaged from each other, and the trip after the claw and the latch receiver are disengaged by the unlocked latch. It is assumed that the crossbar is further driven.

[0005]

According to the present invention, two trip crossbars are connected to each other through play so that one of the movements of the trip crossbar is transmitted to the other after the engagement between the pawl and the latch receiver is released. The overcurrent trip device is not loaded by the other trip mechanism. Then, when the latch by the latch receiver is released and the latch jumps up, the latch further drives the trip crossbar after the engagement between the pawl and the latch receiver is released, and the movement of the trip crossbar is controlled by the other trip. Inform the crossbar to link the tripping action.

[0006]

1 to 3 show an embodiment of the present invention in which two three-pole circuit breakers are connected. FIG. 1 shows the inside of each single circuit breaker except for a cover on only one side. FIG. 2 is a plan view of the connection circuit breaker, FIG. 2 is a side view of a main part of the trip mechanism in an on or off state, and FIG. First, in FIG. 1, a single circuit breaker 1 constituting a 6-pole circuit breaker shown in FIG.
In the same configuration, the current flows from the terminal 2 on the power supply side to the movable contact 3,
It flows to the terminal 7 on the load side via the lead wire 4 and the trip coil 6 of the overcurrent trip device 5. An opening / closing mechanism 9 operated by an opening / closing handle 8 is provided at each central pole, but the mechanism is omitted. Each single circuit breaker 1 is provided with a trip crossbar 10 that forms part of a tripping mechanism across each pole, and an armature 11 of the overcurrent tripping device 5.
It is driven by. Trip crossbar 1
The claw 12 is attached to 0, and the mechanism of this portion will be described below with reference to FIGS.

In FIG. 2, a latch 14 rotatably supported by a latch pin 13 receives a force in a counterclockwise direction in FIG. 2 by an opening / closing spring acting via a toggle link (not shown). 15 to prevent rotation. On the other hand, the latch receiver 15 rotatably supported by the pin 16 receives a force in the clockwise direction in the figure from the latch 14, but the tip is engaged with the claw 12 to prevent the rotation. The claws 12 are gate-shaped with a pair of legs on the left and right.
The arm 12a is fixed by being fitted into the head 0 and extends toward the latch 14 on the head. The claw 12 is rotatably supported by the pin 17, but the force from the latch receiver 15 acting on the claw 12 passes through the center of the pin 17, so that the claw 12 does not rotate, and the state shown in FIG. Is kept. The claw 12 is always urged counterclockwise and the latch receiver is always urged clockwise by a spring (not shown).

The armature 11 of the overcurrent tripping device 5 of each pole faces the trip crossbar 10. When an accident current flows through the tripping coil 6 and the armature 11 is attracted to the iron core 18, the trip crossbar 10 trips. The bar 10 is driven leftward by an armature 11 rotated clockwise in the figure, and the pawl 12 rotates clockwise. As a result, the nail 12
Is disengaged from the latch receiver 15, and the latch receiver 15 rotates clockwise, and the latch 14 unlocked pivots counterclockwise by the force of an open / close spring (not shown) and jumps up. As a result, the action of the opening / closing spring on the toggle link (not shown) connecting the latch 14 and the holder 19 (FIG. 1) holding the movable contact 3 is reversed, and the movable contact 3 is quickly lifted up from the fixed contact. Open (trip operation). FIG. 3 shows a state in which such a trip operation has been completed.

Here, as shown in FIG. 1, each trip crossbar 10 of the single circuit breaker 1 is connected to each other by a connecting rod 20, and when one of the single circuit breakers 1 performs a trip operation, the other is also interlocked therewith. However, the connection of the trip crossbar 10 is performed through play in the illustrated case. That is, in FIG. 1, the stepped cylindrical connecting rod 20 and one (lower side of the figure) trip crossbar 10 are fixed by bonding or the like, and the connecting rod 20 and the other (upper side of the figure) trip crossbar 10 are fixed. Between them, a ring-shaped gap A is provided. And this gap A
When one of the trip crossbars 10 is driven and moved by the overcurrent trip device 5, the trip crossbar 10 moves until the pawl 12 and the latch receiver 15 are disengaged as described above.
The size is set so that the connecting rod 20 and the trip crossbar 10 do not contact each other.

Therefore, when the overcurrent trip device 5 on one side of the two single-circuit breakers 1 is activated, the overcurrent trip device 5 drives only the trip crossbar 10 on that side to engage the pawl. The engagement between the latch 12 and the latch receiver 15 is released. When the latch 14 is released as a result,
The latch 14 springs up by the force of the opening / closing spring and pushes up the arm 12a at its tip as shown in FIG.
Is rotated clockwise. Then, the trip crossbar 10 further moved with the rotation of the pawl 12 drives the other trip crossbar 10 via the connecting rod, and causes the other single circuit breaker 1 to perform a trip operation. As described above, in the illustrated configuration, the two trip crossbars 10 are connected via the play made of the gap A, so that the overcurrent trip device 5 is connected to one of the trip crossbars 1.
0 only needs to be driven, and the other trip crossbar 1
0 is driven by the force of the opening / closing spring acting on the latch 13. Therefore, the load of the overcurrent trip device 5 in the connection circuit breaker is the same as that of the single circuit breaker.

[0011]

According to the present invention, two trip crossbars are connected to each other through play so that one movement of the trip crossbar is transmitted to the other after the engagement between the pawl and the latch receiver is released. Thus, since each overcurrent trip device always bears only one trip load, the same trip characteristics as those of a single circuit breaker can be maintained even in a connected circuit breaker.

[Brief description of the drawings]

FIG. 1 is a plan view of a connection circuit breaker showing an embodiment of the present invention.

FIG. 2 is a side view of a main part of the trip mechanism in FIG. 1 in an on or off state.

FIG. 3 is a view showing a trip state of the trip mechanism of FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Single circuit breaker 5 Overcurrent trip device 10 Trip crossbar 12 Claw 14 Latch 15 Latch receiver 20 Connecting rod A Clearance

Continued on the front page (56) References Japanese Utility Model 50-64957 (JP, U) Japanese Utility Model 63-69348 (JP, U) Japanese Utility Model 2-12140 (JP, U) Japanese Utility Model Utility Model 3-104943 (JP) , U) (58) Field surveyed (Int. Cl. ⁷ , DB name) H01H 71/12

Claims (1)

(57) [Claims] An overcurrent trip device drives a trip crossbar at the time of a trip to engage a pawl with a latch receiver. In this connection circuit breaker, which releases the latch by the latch receiver to release the movable contact, the trip crossbars of the two circuit breakers are connected to each other through play. And, the play is set so that one movement of the trip crossbar is transmitted to the other after the engagement between the claw and the latch receiver is released, and the claw and the latch receiver are unlocked by the latch. The trip crossbar after the disengagement of the trip crossbar is further driven.