JPH0612965A - Circuit breaker - Google Patents

Abstract

PURPOSE:To provide a circuit breaker wherein water infiltrated into a breaker body can be drained to its outside, and an interpole short-circuiting accident due to the infiltrating water can be prevented. CONSTITUTION:Water such as rainwater, infiltrating from an upper end of a case unit 1 along an electric wire connected to a power supply terminal 2, is advanced into a case 19 of a leak detecting block 6. In the case 19, a drain hole 50 is provided in a side wall in the lowermost side, to drain the advanced water to the outside of the case 19 from this drain hole 50. This drained water, which further flows from one end part 52a of a drain groove 52 to the other end part 52b, is drained to the outside of the case unit 1. Since the one end part 52a of the drain groove is coated with a bottom plate 51 mounted on an external bottom surface of a body 10b, insulation is kept relating to a charging part in the case unit 1 appearing from the one end part 52a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker equipped with an earth leakage detection block.

[0002]

2. Description of the Related Art FIG. 4 shows an example of an earth leakage circuit breaker. The earth leakage circuit breaker has a power supply terminal 2 arranged at the upper end of a body 10b of a body 1 and a lower end of the body 10b of the body 10. A load terminal 7 is disposed in the portion, and a partition wall that separates the respective poles is provided in parallel at the bottom of the body 10b so as to extend from the power supply terminal 2 side to the load terminal 7 side. A recess 46 is provided in the vicinity of the load terminal 7, and the recess 46 serves as a housing portion for housing the case 19 housing the zero-phase current transformer 5 of the leakage detection block 6 and the circuit.

[0003]

By the way, generally, the body 1 of the circuit breaker is mounted on a vertical mounting surface with the power supply terminal 2 on the upper end and the load terminal 7 side on the lower end. Therefore, water (rainwater) may enter the body 1 along the electric wire connected to the power supply terminal 2, but the case 19 separates the poles from each other by the partition wall on the power supply side. There is no problem while the water remains. However, when the amount of infiltrated water increases, the movable contactor 8 of each pole of the circuit breaker mechanism unit 3
, And the braid wire 21 for connecting between the abnormal current detection element 4 of each pole is wired through the zero-phase current transformer 5,
There is a problem that it penetrates between the partition walls 1 opened in the housing portion of the case 19 to cause a short circuit between the electrodes.

The present invention has been made in view of the above-mentioned problems, and the object thereof is to prevent water that has infiltrated into the body from being drained to the outside of the body and prevent a short circuit between electrodes due to the infiltrated water. It is to provide a circuit breaker capable of

[0005]

In order to achieve the above object, the present invention provides a circuit breaking mechanism section, an abnormal current detecting element for breaking the circuit breaking mechanism section when an abnormal current is detected,
The leakage detection block that detects the leakage is sequentially arranged at the bottom of the body from the upper end where the power supply terminal is arranged to the lower end where the load terminal is arranged, and penetrates the center through hole of the zero-phase current transformer of the leakage detection block. In the circuit breaker in which the other end of the braided wire, one end of which is connected to the movable contact of the circuit breaker mechanism, is connected to the abnormal current detection element, the case of housing the circuit part of the leakage detection block and the zero-phase current transformer A water draining hole that communicates with the inside and outside of the case is provided at the position of the bottom side wall of the side wall that is the lowermost side of the body, and the outer bottom surface of the body has one end inside the body close to the opening of the water draining hole. An outer bottom surface of the body is provided with a bottom plate which is open and has the other end extending to a lower position of the body, and at least one end of the water drain groove is covered and the other end is opened outward. It was attached to.

[0006]

Thus, according to the present invention, even if water such as rainwater that has entered from the upper end of the body along the electric wire connected to the power supply terminal enters the case of the earth leakage detection block, Water can be drained to the outside of the case from the drain hole provided on the lower side wall, and further to the outside of the body via the drain groove. Therefore, it is possible to prevent a short circuit between the electrodes due to the invading water.
Moreover, since the bottom plate that covers at least one end of the drainage groove and opens the other end outward is attached to the outer bottom surface of the container, the bottom plate is exposed to the outside of the container through one end of the drainage groove. Since the facing charging part can be covered with the bottom plate, the same insulating property as the conventional one can be maintained.

[0007]

EXAMPLES The present invention will be described below with reference to examples. As shown in FIGS. 1, 2 and 3, the circuit breaker of this embodiment includes a power source terminal 2, a terminal plate of the power source terminal 2 and an arc running plate in a body 1 composed of a body 10b and a cover 10a. Fixed contact plate 12 and arc extinguishing device 13, which also serve as a circuit breaker, circuit breaker mechanism 3, earth leakage detection block 6 including zero-phase current transformer 5, circuit breaker mechanism 3 when an overcurrent or an excessive current at the time of short circuit flows Are arranged in the order of the abnormal current detection element 4 including the overcurrent detection element 14 and the short-circuit current detection element 15 for tripping through the interlocking bar 61, and the load terminal 7.
And the abnormal current detection element 4 are provided with a leakage detection block 6 including a zero-phase current transformer 5, and the arc gas generated in the circuit interruption mechanism section 3 due to the presence of the leakage detection block 6. To prevent the abnormal current detection element 4 from being affected by the circuit breaker mechanism 3
It is designed so that the distance to can be shortened.
Here, the circuit breaker mechanism 3, the leakage detection block 6 including the zero-phase current transformer 5, the abnormal current detection element 4, and the load terminal 7 are structured into blocks before being incorporated into the body 1.

The earth leakage detection block 6 holds the frame 16 and the crossbar 32 of the circuit breaker mechanism 3 and also separates the respective poles 17 for separating the poles from the bottom surface of the body 10 to insulate and separate the poles from each other. A detection circuit and the like are provided inside a case 19 made of synthetic resin, which is provided in a recess 46 between the load terminal 7 of the pole and the partition wall 18 on the load terminal side, and is provided in the lower center of the case 19. The zero-phase current transformer 5 is detachably accommodated in the inverted U-shaped accommodation recess 20.
Into the through-hole 5a of the zero-phase current transformer 5, one end of each of the movable contacts 8 of each pole of the circuit breaker mechanism 3 is connected by welding or the like, and a braided wire 21 covered with an insulating tube is inserted. . The other ends of the braided wires 21 ... Are connected to the abnormal current detection elements 4 of each pole by welding or the like.

The leakage detection block 6 can be formed into the above block by temporarily holding the circuit breaker mechanism 3 in the case 19 and fitting the zero-phase current transformer 5 into the housing recess 20. When each of the constituent members configured as described above is incorporated into the body 10, the arc extinguishing device 13 including the power supply terminal 2 and the fixed contact plate 12 is first incorporated, and the fixed contact plate 12 is attached to the bottom surface of the body 10a. After the screws are fixed, a block including the circuit breaker 3, the leakage detection block 6, the abnormal current detection element 4, the load terminal 7 and the like is incorporated, and the interlocking bar 61 and the drive device 22 are placed at predetermined positions.
The procedure is as follows, in which the cover 11 is assembled and attached.

When the circuit breaker mechanism 3, the earth leakage detection block 6, the abnormal current detection element 4, and the load terminal 7 are assembled into the above-described blocks, the frame 16 of the circuit breaker 3 is incorporated.
Are mounted between the partition walls 17 for separating the electrodes, and the supporting arms 29 projecting from the surface of the case 19 on the side of the circuit breaker 3 are placed on the partition walls 17 for separating the electrodes. The inverted U-shaped recess 3 of the rib piece 30 formed on the lower surface near the base of the
3 and a U-shaped recess (not shown) at the end of the partition wall 17 rotatably support the shaft portion 32A of the crossbar 32 of the circuit interruption mechanism portion 3. Further, the terminal plate of the load terminal 7 provided integrally with the abnormal current detection element 4 is arranged in the storage section isolated by each load terminal side partition wall 18, and the abnormal current detection element 4 is also provided.
To arrange. And the abnormal current detection element 4 of the case 19 ...
The tip end of the protruding wall 23 protruding on the side surface is engaged with the engaging groove 25 formed on the end surface of the load terminal side partition wall 17 to insulate and separate the abnormal current detection element 4 of each pole.

The interlocking bar 61 is driven by the detection output of the earth leakage detection block 6 and the drive device 22 and the abnormal current detection element 4
Is for driving the circuit breaker mechanism section 3 in conjunction with the operation of the pressing piece 63, and is separated from the three axial positions at substantially equal intervals.
And a hooking piece 64 project in directions orthogonal to each other, and are rotatably supported at fixed positions on the inner side surfaces of the end portions ga 10b of the interlocking bar 61 in the axial direction. Pressing piece 6
3 is arranged corresponding to the tip of the pressing screw 14a of the overcurrent detection element 14, and the hooking piece 64 is arranged above the driving piece 15a provided in the short-circuit current detection element 15.

The drive device 22 has a known structure in which the plunger 123 of the electromagnetic mechanism is driven by the detection output of the leakage detection block 6, and like the abnormal current detection element 4, the circuit interruption mechanism portion 2 is connected via the interlocking bar 61. Is designed to trip, and the catch pin 12 of the plunger 123 is
3b is inserted into a locking hole 129 formed at the end of the interlocking bar 61 to engage with the interlocking bar 61, and when the plunger 123 is retracted, the interlocking bar 61 is rotated.

By the way, in the case of mounting the side surface of the case 19 on the abnormality detecting element 4 side, that is, the power supply terminal 2 on the upper end side and the load terminal 7 on the lower end side as shown in FIG. Water draining holes 50 communicating with the inside and outside of the case 19 are provided at both sides of the side surface which is the lowermost side of the case 19 and at an intermediate position between them and at a position close to the bottom surface side of the body 10. Figure 1 to correspond to
As shown in (b), a drainage groove 52 having one end 50a opened at the bottom surface of the body 10b near the end of each load terminal side partition wall 17 is provided on the outer bottom surface of the body 10b. The outer bottom surface of the body 10b is a concave plane, and the bottom plate 51 is attached to this concave plane. The other end 5 of the drainage groove 52
2b is open to the outside at the end portion of the bottom plate 51 on the load terminal side, that is, at the end portion of the bottom plate 51 that is the lower end side when mounted.

When the water that has entered the body 10 from the side of the power supply terminal 2 further enters the case 19, it will come out of the case 19 through the water drain hole 50 of the case 19. The water that has come out flows out from one end of the water drain groove 52 to the outer bottom surface of the body 10b. The discharged water further flows downward as a drainage channel between the drainage groove 52 and the bottom plate 51, and is drained to the outside of the body 10 from the other end portion 52b of the drainage groove 52 which is open to the outside. .

Since the one end portion 52a of the drainage groove 52 opening in the body 10b is covered with the bottom plate 51, the charging portion in the body 10b does not face the outside.
Maintains insulation.

[0016]

As described above, according to the present invention, the circuit breaker mechanism section, the abnormal current detection element for breaking the circuit breaker mechanism section when an abnormal current is detected, and the earth leakage detection block for detecting earth leakage are connected to the power supply terminal. Sequentially arranged at the bottom of the body from the arranged upper end to the lower end where the load terminals are arranged, penetrating through the center through hole of the zero-phase current transformer of the leakage detection block and connecting one end to the movable contact of the circuit interruption mechanism. In the circuit breaker in which the other end of the braided wire is connected to the abnormal current detection element, the side wall of the bottom of the body of the side wall that is the lowermost side of the case that houses the circuit part of the leakage detection block and the zero-phase current transformer A water draining hole that communicates with the inside and outside of the case is provided at the position, one end is opened inside the body near the opening of the water draining hole on the outer bottom surface of the body, and the other end is at the lower position of the body. Provide an extended drainage groove and cover at least one end of this drainage groove. However, since the bottom plate that opens the other end to the outside is attached to the outer bottom surface of the body, water such as rainwater that has infiltrated from the upper end of the body along the electric wire connected to the power supply terminal is attached. Even if it enters the case of the earth leakage detection block, it is possible to drain the water out of the case through the water drain hole provided in the lowermost side wall of the case, and further drain this water out of the body through the drain groove. Therefore, it is possible to prevent an inter-electrode short circuit due to infiltrated water, and since one end of this drainage groove is covered with the bottom plate, the insulation of the charging part exposed to the outside of the body through the one end of the drainage groove can be prevented. Can be kept.

[Brief description of drawings]

FIG. 1A is a sectional view of an embodiment of the present invention.
(B) is a rear view of the above.

FIG. 2 is an exploded perspective view of the above.

FIG. 3 is an exploded perspective view of the above-mentioned circuit interruption mechanism portion.

FIG. 4 is a sectional view of a conventional example.

[Explanation of reference symbols] 1 body 2 power supply terminal 3 circuit breaker mechanism 4 abnormal current detection element 5 zero-phase current transformer 6 leakage detection block 7 load terminal 10a cover 10b body 19 case 50 drain hole 51 bottom plate 52 drain groove 52a One end 52b The other end

Front page continuation (72) Inventor Kosei Kimura 1 Mie Kinzoku Kogyo Co., Ltd., 564 Solda, Tsu City, Mie Prefecture. Within the corporation

Claims (1)

[Claims] 1. A circuit breaking mechanism, an abnormal current detecting element for breaking the circuit breaking mechanism when an abnormal current is detected, and an earth leakage detecting block for detecting electric leakage, and load terminals are arranged from the upper end where power terminals are arranged. The other end of the braided wire, which is sequentially arranged at the bottom of the body reaching the lower end, penetrates the center through hole of the zero-phase current transformer of the leakage detection block and has one end connected to the movable contact of the circuit breaker mechanism. In the circuit breaker connected to the abnormal current detection element, the water that communicates with the inside and outside of the case at the bottom side of the case that houses the circuit section of the leakage detection block and the zero-phase current transformer. A drain hole is provided, and an outer bottom surface of the body is provided with a drain groove having one end opened inside the body close to the opening of the water drain hole and the other end extending to a lower position of the body, At least one end of this drainage groove is covered, and the other end is opened outward. Circuit breaker, characterized in that the bottom plate has been attached to the outer bottom surface of the device body to.