JPH11266511A - Terminal barrier device of circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attach insulating plates only by the simple handing of a holding member, without using a tool, even after wires, etc., have been attached. SOLUTION: Inter-phase insulating plates 8 and 9 and an inter-I/O insulating plate 10 are combined and attached to a terminal block, and the inter-I/O insulating plate 10 is fixed by snapping metal fittings 11 which are elastic members. A circuit breaker is a multi-phase breaker and has a plurality of inter-phase insulating plates 8 and 9, provided between adjacent phases and the inter-I/O insulating plate 10. When the inter-phase insulating plates 8-10 are attached to the circuit breaker, notches are formed in the crossing parts of the respective inter-phase insulating plates 8-10 so as to gear each other, when the inter-phase insulating plates 8-9 are combined. The inter-phase insulating plates 8 and 9 are fitted to grooves formed in the terminal block of the circuit breaker, and at the same time is held by the inter-I/O insulating plate 10 which has retaining parts on both its end parts.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal barrier device for insulating terminals of a circuit breaker.

[0002]

2. Description of the Related Art FIGS. 6 and 7 are a back view and a side view of a three-phase circuit breaker equipped with a conventional terminal barrier device.

In FIG. 6, the circuit breaker has R-, S- and T-phase input-side terminals (power-supply-side terminals) 31, 32, and 33 from the left on the terminal block 30, and outputs from the left. Side terminals (load side terminals) 34, 35, 36 are attached to the lower side. Insulating plates 37 and 38 are attached to these terminals, particularly between the adjacent R and S phases, and between the S and T phases in order to prevent short circuit between phases.

[0004]

In many cases, the insulating plate of the terminal barrier device is attached after attaching them so as not to hinder the operation of attaching electric wires and bus bars to the terminals. However, since the conventional terminal barrier device has a structure in which the insulating plate is attached with screws, it is difficult to attach the insulating plate after attaching a large number of thick electric wires or bus bars, particularly in the case of a large circuit breaker. .

It is an object of the present invention to provide a terminal barrier device for a circuit breaker that can be easily mounted by solving such problems.

[0006]

In order to solve such a problem, a terminal barrier device of a circuit breaker according to the present invention is provided between guide terminals of a circuit breaker by guide means, and an engaging portion is provided at an end. An insulating plate comprising: a substantially U-shaped elastic member, both leg ends of which are inserted and attached to holes formed in the fixing member, and engage with the engaging portion of the insulating plate at a connecting portion connecting the two legs. And a flexible holding member.

[0007] With this configuration, a simple U-shaped holding member is inserted into and attached to the hole of the fixing member, the insulating plate is fitted into the guide means, and the holding member of the elastic member is attached to the end of the insulating plate. The terminal barrier device can be attached by a simple operation of engaging only.

[0008] The terminal barrier device for a circuit breaker according to the second aspect of the present invention, in addition to the features according to the first aspect of the present invention, includes a plurality of inter-phase insulating plates provided between adjacent phases in a multi-phase circuit breaker. An input / output insulating plate provided between the output terminals, wherein notches are formed so as to mesh with each other at portions where the two insulating plates intersect each other when the insulating plates are attached to the circuit breaker. And is held by an input / output insulating plate having an engaging portion formed at an end thereof.

With such a configuration, a plurality of interphase insulating plates used in the multiphase circuit breaker can be held by a single input / output insulating plate which can be easily attached and detached by the holding member, and the insulation between the input / output terminals can be maintained. Can also be secured.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a terminal barrier device for a circuit breaker according to the present invention will be described with reference to the embodiments shown in FIGS.

FIG. 1 is a perspective view mainly for explaining the back surface of the three-phase circuit breaker. A terminal block 3 made of an insulating molded product is attached to a pair of angles 2 extending between a pair of side plates 1. Have been. The terminal block 3 has an R-phase input terminal 4, an S-phase input terminal 5 and a T-phase input terminal (not shown) on the upper side, and an R-phase output terminal 6 on the lower side. , S-phase output terminal 7 and T-phase output terminal (not shown) are attached. Further, the terminal block 3 has an input terminal 4 and an output terminal 6 for the R phase and an S terminal.
A vertical groove 3a is formed between the phase output terminal 5 and the output terminal 7, and a groove 3b is similarly formed between the S phase terminal and the T phase terminal. Are interposed between the R and S terminals and between the S and T terminals. Further, an input / output insulating plate 10 is provided in the left-right direction so as to insulate all input-side terminals and output-side terminals.
Attached by one.

Referring to FIG. 2, elongated inter-phase insulating plates 8 and 9 are formed with elongated groove-shaped notches 8a and 9a, respectively.
a and 10b are formed. These notches function as guide means for the input / output insulating plate 10, and the notches 8
A notch 10a is engaged with a, and a notch 10b is engaged with the notch 9a, and the two insulating plates are combined so as to be orthogonal to each other. Then, the two interphase insulating plates 8 and 9 are held between the terminal block 3 and one input / output insulating plate 10 and mounted as shown in FIG.

Referring to FIG. 3, the clasp 11 is made of an elastic wire and has a substantially "U" shape having a pair of legs 11a and a connecting portion 11b connecting these legs when viewed in the X direction in the drawing. , Are formed in an arc shape when viewed from the Y direction.

The insulating plate 10 between input and output is fixed by a clasp 11
This is performed in the following manner using First, a pair of legs 1 whose ends are bent to prevent falling off after the clasp 11 is attached.
The end of 1a is inserted into a square hole 1a formed in the side plate 1 and mounted. Next, the input / output insulating plate 10 is attached to the terminal block 3 so as to hold the interphase insulating plates 8 and 9 as described above,
The clasp 11 is extended, and the connecting portion 11b is moved over the mountain of the chevron so as to be engaged with the engaging end 10c. In this manner, the input / output insulating plate 10 can be fixed by the elasticity of the clasp 11. Note that the input / output insulating plate 10 is fitted into a groove-shaped notch 1b functioning as a guide means formed on the side plate 1 near the engaging end 10c having the angled side, thereby increasing the mounting stability. .

A modification of the above-mentioned clasp is shown in FIGS. 4 and 5. The clasp 12 is a wire made of an elastic member and has coil-shaped spring mechanisms 12a formed on both legs thereof, and has the same function as the clasp 11.

[0016]

The present invention is embodied in the form as described above. According to the first aspect of the present invention, even after attaching an electric wire or the like, the insulating plate can be formed simply by operating the holding member without using a tool. Can be attached. According to the second aspect of the present invention, in addition to the effect of the first aspect, in the polyphase circuit breaker, the inter-phase insulating plate can be fixed by performing the work of fixing the input-output insulating plate.

[0017]

[Brief description of the drawings]

FIG. 1 is a view of a circuit breaker equipped with an embodiment of a terminal barrier device for a circuit breaker according to the present invention, as viewed obliquely from behind.

FIG. 2 is a diagram illustrating a method of combining the insulating plates of FIG.

FIG. 3 is a diagram illustrating a method of fixing the insulating plate of FIG. 1;

FIG. 4 is a front view showing a modification of the clasp.

FIG. 5 is a side view of FIG. 4;

FIG. 6 is a back view of a circuit breaker to which a conventional terminal barrier device is attached.

FIG. 7 is a side view of FIG. 6;

[Explanation of symbols]

1 Side plate (1a square hole, 1b cutout) 8, 9 Interphase insulating plate (8a 9b notch) 10 Input / output insulating plate (10a, 10b notch,
10c engaging end) 11, 12 clasp (11a leg, 11b connecting part)

Claims (2)

[Claims] 1. An insulating plate provided between guide terminals of a circuit breaker by a guide means and having an engaging portion at an end thereof, and a substantially U-shaped elastic member having both leg ends formed in a fixed member. A terminal barrier device for a circuit breaker, comprising: a holding member that is inserted into and attached to a connector and that is capable of engaging with an engaging portion of the insulating plate at a connecting portion that connects the legs. 2. The circuit breaker according to claim 1, wherein said circuit breaker includes a plurality of interphase insulating plates provided between adjacent phases and an input / output insulating plate provided between input / output terminals. Notches are formed in the two insulating plates so as to mesh with each other at portions that intersect each other when attached to the circuit breaker.The inter-phase insulating plate is fitted into a groove provided on a terminal block of the circuit breaker, The terminal barrier device for a circuit breaker according to claim 1, wherein the terminal barrier device is held by the input / output insulating plate having the engaging portion formed at an end thereof.