JPS6122530A - Breaker - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention particularly relates to the structure of a small circuit breaker that turns off contacts via a trip mechanism when detecting an overcurrent or a ground fault current.

(Prior art) Conventionally, in the case of a circuit breaker that activates a trip device and turns off the contact when overcurrent or ground fault current is detected, these detection devices are placed in a state that does not affect the operation of the contact opening/closing mechanism and the trip device. must be installed on the base of the circuit breaker body,
Moreover, since ground fault current detection requires many parts and devices such as a zero-phase current transformer, an amplifier, and a tripping electromagnet, not only does the circuit breaker as a whole become large compared to its breaking capacity, but In addition to the contact opening/closing mechanism and trip device, each of the detection devices described above must be individually assembled and adjusted on the base of the circuit breaker body, which requires considerable effort and time to produce the circuit breaker. The drawback was that it significantly increased costs.

(Problems to be Solved by the Invention) The present invention provides a circuit breaker that operates a trip device and turns off a contact when detecting an overcurrent or a ground fault current, and the external shape of the circuit breaker is made small in relation to its breaking capacity. Moreover, it is possible to easily assemble and adjust the circuit breaker, thereby significantly reducing the production cost of the circuit breaker.

(Means for Solving the Problem) As shown in FIGS. 1 and 2, the present invention moves the movable contact 2 to the fixed contact 3 by a toggle action by rotating the handle 1 from the contact OFF position to the contact ON position. Contact opening/closing mechanism 4 that turns on and off by turning on and off, and bimetal 5 that uses overcurrent energization
an overcurrent trip that releases the toggle operation of the contact opening/closing mechanism 4 by thermal deformation of the contact opening/closing mechanism 4, turns off the movable contact 2, and automatically returns the handle 1 from the contact on position to the contact off position by the biasing force of the spring 6; The contact opening/closing mechanism 4 and the inner surface of the synthetic resin cover 10 which is attached to the base 8 and has the operating portion 9 of the handle 1 protruding from it are attached to the synthetic resin base 8 on which the mechanism 7 is attached. A frame body 11 made of synthetic resin that can be stored in a space with a substantially U-shaped cross section formed between the overcurrent trip mechanism 7 is provided, and the frame body 11 is connected to each of the contacts 2.3. The toggle operation of the contact opening/closing mechanism 4 is canceled and the movable contact 2 is turned off by the operation of the electromagnetic device @ 14 via the amplifier 13 by the output from the zero-phase current transformer 12 whose primary coil is the load circuit. while holding the handle 1 with the spring 6.
The amplifier 1 of the earth terminal current trip mechanism 15 automatically returns from the contact ON position to the contact OFF position by the urging force of
3 and an electromagnet device 14 are assembled together.

(Function) In the circuit breaker 16 configured in this way, the handle 1
When is in the OFF position, the toggle operation of the contact opening/closing mechanism 4 is in a released state, and each movable contact 2.3 is in an OFF state.

Next, when the handle 1 is rotated from the off position to the on position in this state, the movable contact 2 is turned on by the toggle operation of the contact opening/closing mechanism 4, and when an overcurrent is detected in this on state, the bimetallic The toggle operation of the contact R closing mechanism 4 is released by the activation of the trip mechanism 7 due to the thermal deformation of 5, and similarly, when a ground fault current is detected in the on state, the electromagnet is activated by the output from the zero-phase current transformer 12. The trip mechanism 15 is activated by the operation of the device 14, and the toggle operation of the contact opening/closing mechanism 4 is released, and the movable contact 2 is placed in the -off state. In addition, the contact can be opened/closed by rotating the handle 1 from the on position to the off position. The toggle operation of the mechanism 4 is released and the movable contact 2 is turned off.

(Embodiment) Next, the configuration of an embodiment of the present invention will be described with reference to FIGS. 3 to 7.

External wiring terminals 31 to 34 are attached to the left and right positions of both ends of the synthetic resin base 30 in the longitudinal direction, which is formed into a rectangular shape.
33 is connected to a fixed contact 35 connected to one terminal 31 and the other terminal 33 via an overcurrent detection bimetal 36 and a lead wire 38 as a primary coil of a zero-phase current transformer 37, and A movable contact 39 that operates on and off is mounted opposite the fixed contact 35, and a fixed contact connected to one terminal 32 is located between the terminals 32 and 34 in the longitudinal direction of the left and right sides of the base 30. 40 and the other terminal 34 are connected to the zero-phase current transformer 37 via a lead wire 41 as a primary coil, and a movable contact 42 is attached that faces the fixed contact 40 and operates on and off. ing.

A frame 43 attached to the center of the base 30 has an operating portion 45 protruding from the surface of a synthetic resin lid 44 attached to the base 30, and a spring 46 allows the frame 43 to be operated as shown in FIGS. 3 and 4. A contact opening/closing mechanism that turns the movable contact 39.42 on and off with respect to the fixed contact 35.40 by a toggle action caused by rotation of the handle 47, which is biased counterclockwise in the figure, from the contact off position to the contact on position. 48, thermal deformation of the bimetal 36 due to overcurrent application releases the toggle operation of the contact opening/closing mechanism 48, turns off the movable contacts 39, 42, and moves the handle 47 to the contact on position by the biasing force of the spring 46. An overcurrent trip mechanism 49 that automatically returns the contact to the OFF position from the contact position, and a space that has a substantially U-shaped cross section and is formed between the inner surface of the lid 44, the contact opening/closing mechanism 48, and the overcurrent trip mechanism 49. An amplifier 50 based on the output from the zero-phase current transformer 37 through which the lead wires 38 and 41 are inserted.
The toggle operation of the contact opening/closing mechanism 48 is canceled by the operation of the electromagnetic device 51 via the movable contact 39.
42 and automatically returns the handle 47 from the contact ON position to the contact OFF position by the biasing force of the spring 46.

That is, a second pin 57 that reciprocates along a groove 56 formed in the frame 43 is attached to the end of the connecting plate 55 which is connected by a first pin 54 at an arbitrary radial position centering on the shaft 53 of the handle 47. A hooking piece 58 is attached to the frame 47 and the shaft 5 is attached to the frame 47.
A bar spring 6 is rotatable about 9 and is hung between the shaft 59, the frame 47, and the engaging piece 58.
0 in the counterclockwise direction in FIG.
An adjustment screw 63 for adjusting the gap between the bimetal 36 and the plunger 62, which is attracted by the excitation of the coil 61 of the electromagnet device 51, is attached to the tip of the engaging piece 58, and the second pin 57 is attached to the second pin 57. The separator 65 made of an insulating material reciprocates vertically along the groove 64 formed between the base 30 and the frame 43 while engaging the contact points 39 and 42 in the vertical direction, and the stepped portion 66 of the engaging piece 58. When the engaging trip arm 67 is attached and the handle 47 is rotated from the OFF position shown in FIG. 3 to the ON position shown in FIG. The movable contact 39.42 contacts the stopper side 68 of the frame 43 and toggles, crossing the center line CL connecting the shaft centers of the frame 43 with a straight line.
When the handle 47 is rotated from the on position to the off position while the contact is in the on state, the first pin 54 crosses the center line CL between the axes, the toggle operation is released, and the pin is movable. In addition to the contact points 39 and 42 moving upward to maintain the contact OFF state, the engaging piece 58 is biased by the biasing force of the bar spring 6o due to thermal deformation of the bimetal 36 due to overcurrent detection or attraction of the plunger 62 due to ground fault current detection. The handle 47 is rotated from the on position to the off position by the biasing force of the spring 46 due to the disengagement between the stepped part 66 of the engaging piece 58 and the trip arm 67 due to the counter rotation, and the movable contact 39.42 is also moved upward. The contact is kept in the OFF state.

Note that the unit-shaped ground current trip mechanism 52 assembled to the synthetic resin frame 69 has the frame 69 attached to the base 3.
0, the auxiliary movable contact 71 that forms a pseudo leakage circuit between the auxiliary fixed contact 7o attached to the terminal 33 and a resistor (not shown) is attached, and the lid body 44 is attached to the base 30. When the test button 72 attached to the lid body 44 is pressed in this state, the auxiliary movable contact 71 contacts the auxiliary fixed contact 70 to form a pseudo leakage circuit, which activates the trip mechanism 52 and changes the contact from the on state to the off state. and the test button 73
When the handle 47 is rotated from the on position to the off position by pressing the
Bend it so that it does not hit the fingers of the person above you, so that the operating portion 45 of the handle 47 is vertical in the off position, as shown in FIG.

In the circuit breaker 73 configured in this way, the ground current trip 1l requires relatively time and effort to wire and assemble.
Since the Ilf 152 can be separated from the contact opening/closing mechanism 48 and the overcurrent trip mechanism 49, which are assembled directly on the base 30, and assembled completely separately, the productivity of the circuit breaker 73 can be greatly improved. This tripping mechanism 52 for ground current can be effectively housed in the U-shaped space between the frame 43 and the inner peripheral surface of the lid 44, and thereby the external shape of the circuit breaker 73 can be easily assembled. Moreover, it can be made small.

(Effects of the Invention) The present invention provides an independent unit in which the trip mechanism for ground current is incorporated into the frame, and is installed in the U-shaped space between the frame on the base and the circumferential surface of the lid body attached to the base. By effectively storing the circuit breaker, the external shape of the circuit breaker, which activates the trip device and turns off the contact when overcurrent detection or ground fault current is detected, can be made small compared to the appropriate capacity, and the circuit breaker can be easily assembled and adjusted. This has the effect of greatly reducing the production cost of the circuit breaker.

[Brief explanation of drawings]

Figures 1 and 2 are block diagrams showing the overall structure of the present invention;
4 and 4 are cut-away front views of an embodiment of the present invention at different positions, FIG. 5 is a partially cut-away side view thereof, FIG. 6 is a partially cut-away side view thereof, and FIG. It is a partially exploded perspective view.

Claims (1)

[Claims] A contact opening/closing mechanism turns the movable contact on and off relative to the fixed contact through a toggle action when the handle is rotated from the contact OFF position to the contact ON position, and the toggle action of the contact opening/closing mechanism is canceled by thermal deformation of the bimetal due to overcurrent application. to a synthetic resin base on which is attached an overcurrent trip mechanism that turns off the movable contact and automatically returns the handle from the contact on position to the contact off position by the biasing force of a spring. A synthetic resin lid that can be stored in a space that has a substantially U-shaped cross section and is formed between the inner surface of a synthetic resin lid that is attached to the handle and has an operating part of the handle protruding from the handle, and the contact opening/closing mechanism and the overcurrent trip mechanism. The contacts are opened and closed by the operation of an electromagnetic device via an amplifier using the output from a zero-phase current transformer, which has a resin frame and whose primary coil is a load circuit connected to each contact in the frame. The amplifier and electromagnetic device are integrated into a ground fault current trip mechanism that releases the toggle operation of the mechanism, turns off the movable contact, and automatically returns the handle from the contact on position to the contact off position by the biasing force of a spring. A circuit breaker characterized by being assembled into.