JPH0142282Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to improvements in circuits and breakers that open and close electrical circuits.

Generally, in circuit breakers, arcs occur when the contacts open. This arc and the high-temperature gas generated along with it cause a sudden increase in the internal pressure of the circuit or disconnector, but these arcs and gas are exhausted to the outside through the arc outlet, thereby reducing the internal pressure. The increase will be suppressed.

By the way, circuit breakers are usually provided with terminals on both sides, one terminal being connected to a power source and the other terminal being connected to a load. However, if the arc is discharged to the power source side, there is a high risk that the arc will come into direct contact with the terminal, which is a live part, resulting in a so-called secondary short circuit accident. On the other hand, when the arc is discharged to the load side, even if the arc contacts the terminal, no voltage is applied to the terminal, so there is no risk of a secondary short circuit.
Therefore, it is preferable for safety to discharge the arc to the load side.

However, depending on how a circuit or disconnector is used, which of the terminal parts on both sides is used as the power supply side and which terminal part is used as the load side may differ. Therefore, if the structure is such that the arc is discharged only to one side or to both sides, it is not possible to prevent secondary short circuits depending on the usage of the circuit or disconnector. The problem is that it is not possible.

This invention was made in order to eliminate the above-mentioned drawbacks, and its purpose is to provide a circuit breaker or breaker that can effectively prevent secondary short circuits depending on the mode of use.

Embodiments of this invention will be described below with reference to the drawings. FIG. 1 shows a partially cutaway front view of a circuit breaker according to an embodiment of the invention.

In the figure, 1 is a cover, 2 is a base, the cover 1 and the base 2 constitute a housing 100, and inside this housing 100, a fixed contact 3, a fixed contact 4,
A sheath cutting mechanism 200 including a movable contact 5, a movable contact 6, an arc extinguishing plate 7, and the like is built-in. 8 is an operating lever, and 9 is a back cover. As shown in FIG. 2, an arc discharge passage 10 is formed on the back surface of the base 2, passing through from one terminal side to the other terminal side.
It communicates with an arc discharge port 11 provided on the back surface of the. The circuit breaker shown in this embodiment is for three-phase switching, and therefore three passages 10 and three arc discharge ports 11 are provided corresponding to each pole. Each passage is partitioned by a protrusion 12 integrally formed with the base 2. Also, each aisle 1
Openings 10 for arc discharge formed at both ends of the
Grooves 13a, 13b are formed near a, 10b, and the openings 1 are formed in these grooves 13a, 13b.
A closing plate 14 made of an insulating material that selectively closes either one of 0a and 10b is detachably inserted. Further, the back cover 9 is attached to the back surface of the base 2 by adhesive means such as double-sided adhesive tape, and covers the passage 10 leaving openings 10a and 10b at both ends.
In addition, in FIG. 1, 15 is a mounting panel to which a circuit or disconnector is attached, and in FIG.
is a partition wall (not shown) that partitions the terminals.

In the circuit and disconnector having the above structure, the opening 10a side is now the power supply side, and the opening 1
When the 0b side is the load side, as shown in FIGS. 1 and 2, a closing plate 14 is inserted into the groove 13a to close the opening 10a. By this,
The arc and high-temperature gas generated between the contacts 4 and 5 are discharged to the outside from the opening 10b on the load side via the arc outlet 11 and the passage 10, so there is no risk of secondary short circuit on the power source side. On the other hand, when the opening 10b side is used as the power supply side and the opening 10a side is used as the load side, the same can be achieved by inserting the closing plate 14 into the groove 13b and closing the opening 10b, contrary to the above. This can prevent secondary short circuits on the power supply side.

In addition, in the above embodiment, the closing plate 14 is connected to the groove 1.
When inserting into 3a or 13b, it is desirable to press fit so that it does not easily come out. Further, instead of separately preparing the closing plate 14 corresponding to each pole, it is also possible to configure a single closing plate to close all the openings 10a or 10b of each pole. Furthermore, by integrally forming the closing plate 14 on the edge of the back cover 9 and attaching the back cover 9 to the back surface of the base 2 in a detachable manner, the closing plate 14 can be inserted into the groove 13a or 13b on any side at the same time as the back cover 9 is attached. It is possible to insert it into.

As explained above, according to this invention, the casing housing the shrunken mechanism is communicated with the inside of the casing,
In addition, there is an arc exhaust passage whose both ends communicate with arc exhaust openings on the power supply side and load side formed on both sides of the housing, and one of the openings is selectively closed. Since a removable closing plate is provided, no matter which side of the housing becomes the power supply side depending on the usage of the circuit or disconnector, the opening on the power supply side can be closed by the closing plate. By closing, the arc is discharged to the outside from the opening on the load side, and a secondary short circuit can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view showing an embodiment of the circuit breaker according to this invention, and FIG. 2 is an exploded perspective view of the base viewed from the back side. 10... passage, 10a, 10b... opening, 1
1...Arc exhaust port, 13a, 13b...Groove, 1
4... Closure plate, 100... Housing, 200... Shrinking mechanism. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] A housing housing the cutting mechanism, and an arc exhaust device that communicates with the inside of the housing and has both ends communicated with arc exhaust openings on the power supply side and the load side formed on both sides of the housing. and a removable closing plate that selectively closes either one of the openings.