JPH0334034Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] This invention relates to a plug-in connection device for a circuit breaker, and in particular, when the circuit breaker main body is removed from the plug-in connection base, electric shock at the plug-in connection base is prevented. This invention relates to a plug-in connection device for a circuit breaker that prevents accidents.

[Prior Art] Generally, a plug-type connection terminal is provided on the back of the main body of an insulated box-type circuit breaker, while a plug-type connection terminal is provided on the connection base made of a fixed insulator to which the circuit breaker main body is attached. A tube-shaped connection terminal that fits into the terminal is provided, and both terminals are detachable. Normally, it is used with a circuit breaker attached to the plug-in connection stand, but it is designed to be detachable so that the circuit breaker can be easily removed during maintenance and inspection.

[Problems to be Solved by the Invention] The conventional plug-in connection device for a circuit breaker as described above has a safety problem in the disconnected state during maintenance and inspection. In other words, in the disconnected state, the circuit breaker body is disconnected from the power supply, so there is no problem, but the connection terminals of the plug-in connection board are recessed and shaped like a tulip, as mentioned above. The contact piece constituting the remains energized. Therefore, there is a risk that the inspector's finger may inadvertently touch this contact piece and cause an electric shock accident. This becomes even more dangerous because the larger the size of the connection terminal, the larger the opening of the plug-in connection base that leads to the contact piece.

This invention has been made to solve this problem, and provides a plug-in connection device for a circuit breaker that is free from the risk of electric shock when disconnected, even if it is a removable plug-in connection device. The purpose is to

[Means for Solving the Problems] The plug-type connection device for a circuit breaker according to the present invention has the following features: A plug-type terminal is provided with a hollow column-shaped guard ring made of an insulator that is placed on the peripheral wall of the plug-type terminal, and a rod-shaped guard bar made of an insulator that is inserted into the hollow part of the plug-type terminal. be.

[Function] In this invention, when the circuit breaker is removed, the guard ring and guard bar made of the above-mentioned insulator are formed around the connection terminal of the plug-in connection block, so that it is difficult for fingers to reach the contact piece. prevent.

[Embodiment of the invention] Figures 1 and 2 are diagrams showing an embodiment of the plug-in connection device for a circuit breaker of this invention.
The figure is a cutaway side view of the main parts of the circuit breaker main body connected to the plug-in connection board, and FIG. 2 is a perspective view of the main parts including a partially exploded view of the plug-in connection board.

The configuration will be explained below based on both figures.

In the figure, a circuit breaker 1 having a closing jacket made of an insulating material is detachably attached to a fixedly supported plug-in connection base 2 made of an insulating material. The plug type terminal 3 attached to the back of the circuit breaker 1 is
Tip part 3a formed into a cylindrical shape and having a hollow part 3b
Equipped with The plug-in connection base 2 is provided with a housing portion 5 for housing the plug-type terminal 3 and the corresponding bulb-side tulip-type terminal 4. The stud head 4a of the tube-shaped terminal 4 is formed with a contact surface portion having a recess, and the contact piece 6 is made up of a plurality of conductive pieces equally divided in the axial direction, and each conductive piece has a recess 7a, 7b. have The respective recesses 7a on the opening side are fastened together by a metallic annular elastic band 8a, and the respective recesses 7b on the other end are also secured with a metallic annular elastic band so as to be joined to the recesses on the contact surface of the stud head 4a. It is fastened and attached by 8b. An insulating protrusion 9, which serves as a guard bar and protrudes from the contact piece 6 toward the opening side, is implanted in the axial center of the stud head 4a. The protrusion 9 may be a metal pin coated with an insulator,
Alternatively, it may be of a screw-in type and removable. The protruding length and shape of the protrusion 9 are determined so that it can be inserted into the hollow portion 3b of the plug-type terminal 3 in the mating position as shown in the figure.

On the other hand, around the opening of the storage part 5 that stores the contact piece 6 of the tube-shaped terminal 4 of the plug-in connection base 2,
A cylindrical guard ring 10 made of an insulating material is attached. The guard ring 10 includes a collar portion 10a, a cylindrical portion 10b extending outward, and a mounting claw portion 10c protruding in the opposite direction. The collar portion 10a is inserted into the storage portion of the plug-in connection base 2, and the tip of the claw portion 10c engages with a part of the metallic annular elastic band 8a to be held. The guard ring 10 is not limited to this method, and any structure may be used as long as it is fixed and attached so that the cylindrical portion 10b faces outward from the periphery of the housing portion of the plug-in connection base.

With the above structure, when the circuit breaker 1 is installed as shown in FIG. The insulating guard ring 10 is inserted into the hollow part 3b and is positioned so as to cover the outer peripheral surface of the plug-shaped terminal 3, and the outer peripheral surface of the tip end of the plug-shaped terminal 3 is covered with the tulip-shaped terminal 4.
It fits into the contact piece 6 of.

Plug-in connection base 2 when circuit breaker 1 is removed
As shown in FIG. 2, on the opening side of the storage part 5 that stores the contact piece 6 of the tube-shaped terminal 4 of the plug-in connection board 2, there is a cylindrical part 10b of a guard ring 10 made of an insulating material and an insulating material. The protrusion 9 is in a protruding state. Here, it is desirable that the gap between the guard ring 10 and the protrusion 9 be less than the thickness of a finger.

Therefore, in the case of maintenance and inspection, conventionally, the finger of the inspector's hand may slip into the wide opening formed by the contact piece 6 of the tube-shaped terminal 4, which serves as the receptacle of the plug-type terminal 3, and the contact piece However, in the embodiment of this invention, it is possible to keep the gap between the cylindrical portion 10b of the guard ring 10 made of an insulating material and the insulating protrusion 9 so narrow that a finger cannot be inserted. . That is, the cylindrical portion 10b of the insulative guard ring 10 and the tips of the insulative protrusions 9 prevent the fingers from entering, so that the contact pieces 6 are not touched.

In the above embodiment, the plug-type terminal and the guard ring are cylindrical in shape, but they may also be in the shape of a hollow prism and the same effect can be obtained.

Furthermore, although the above embodiment is applied to a plug-in connection device for a circuit breaker, it goes without saying that the invention can also be applied to other plug-in connection devices having a similar configuration.

[Effects of the invention] As explained above, this invention provides insulating guard rings and guard bars around the connection terminals of the plug-in connection board that do not cause problems when normally installed, so that when the circuit breaker is separated, This has the effect of providing a highly safe circuit breaker connection device that is free from the risk of electric shock caused by fingers touching the connection terminals of the connection board.

[Brief explanation of the drawing]

Fig. 1 is a cutaway side view of main parts showing an embodiment of the invention in which a circuit breaker and a plug-in connection board are connected, and Fig. 2 is a main part including a partially exploded view of the plug-in connection board of Fig. 1. FIG. In the figure, 1 is a circuit breaker, 2 is a plug-in connection block, 3 is a plug type terminal, 3a is a tip, 3b is a hollow part, 4 is a tube type terminal, 6 is a contact piece, 9
is a protrusion, and 10 is a guard ring. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A hollow columnar plug-shaped terminal protruding from the back of a circuit breaker, and the plug-shaped terminal embedded in a plug-in connection base on which the circuit breaker is installed. a connecting terminal shaped to fit into the peripheral wall of the connecting terminal; and an insulating terminal protruding from the plug-in connection base so as to be located on the outer periphery of the plug-type terminal when the plug-type terminal and the connecting terminal are fitted together. a hollow column-shaped guard ring consisting of a body; and an insulating guard ring protruding from the plug-in connection base so as to be inserted into the hollow part of the plug-type terminal when the plug-type terminal and the connection terminal are fitted together. A plug-in connection device for a circuit breaker, which is equipped with a bar-shaped guard bar. (2) The plug-in connection device for a circuit breaker according to claim 1, wherein the hollow column is cylindrical. (3) The plug-in connection device for a circuit breaker according to claim 1 or 2, wherein the gap between the guard ring and the guard bar is smaller than the width of a finger. (4) The guard ring and the guard bar are
Scope of utility model registration claim 1: It is removable.
A plug-in connection device for a circuit breaker according to item 1, 2 or 3. (5) The plug-in connection device for a circuit breaker according to claim 1, wherein the insulator is a metal body coated with an insulator. (6) The connection terminal has a plurality of tulip-shaped contact pieces.
Plug-in type connection device for the circuit breaker described in .