KR20130031791A - Circuit breaker - Google Patents

Abstract

PURPOSE: A circuit breaker is provided to prepare a porous in a mounting surface than a terminal unit of a terminal block, thereby improve a waterproof property. CONSTITUTION: A terminal block(9) has a terminal unit(91), a contact point holding part(92), and a connection part. The terminal unit is exposed to the housing(4) outside looking at an upper direction, and a wire(5) is connected through. The contact point holding part holds a fixing contact point(11) inside the housing. The connection part interposes between the terminal unit and the contact point holding part. A projection direction of the terminal unit from the connection part is facing the upper direction. In the housing, a mounting surface, than the terminal unit, prepares a porous(42) which in and out of the housing is connected through.

Description

Circuit breaker {CIRCUIT BREAKER}

The present invention relates to a circuit breaker.

Conventionally, the circuit breaker which detects an overcurrent etc. and cuts off a circuit is provided (for example, refer patent document 1).

Some circuit breakers of this kind are shown in FIG. 2, for example. The circuit breaker of FIG. 2 is a trip device which separates the movable contact 21 from the fixed contact 11 when an abnormal current flows between the fixed contact 11 and the movable contact 21 and the contacts 11 and 21 ( tripping device) 3 and a housing 4 in which the respective portions are housed.

Here, the housing 4 faces a predetermined surface (left side in FIG. 2) to a substantially vertical mounting surface (not shown, for example, the inner bottom of the distribution board), and the other predetermined surface (the upper surface in FIG. 2). ) Is upward and fixed to the mounting surface.

The fixed contact 11 is held by a terminal plate 9 made of a conductive material. The terminal plate 9 has a terminal portion 91 exposed to the outside of the housing 4 when viewed from above, a contact holding portion 92 holding the fixed contact 11, and between the terminal portion 91 and the contact holding portion 92. It has a connecting portion 93 interposed therebetween. The terminal part 91 is hold | maintained in the state which the electric wire 5 contacted and conducted, for example by well-known terminal structures, such as a screw terminal.

Japanese Patent Publication No. 2009-158370

In the above conventional example, the terminal portion 91 protrudes upward from the connecting portion 93, and the contact holding portion 92 protrudes downward from the connecting portion 93.

However, in the above conventional example, when water is submerged in the housing 4 via the wire 5 as indicated by the arrow A1, the water rides on the terminal plate 9 as indicated by the arrow A2. It is easy to reach the fixed contact 11. As such, the water reaching the fixed contact 11 promotes corrosion of the fixed contact 11, resulting in shortening of service life.

The present invention has been made in view of the above reasons, and an object thereof is to provide a circuit breaker with improved water resistance.

The circuit breaker of the present invention is made of a housing fixed to the mounting surface, a conductive material, a terminal plate held by the housing to hold a fixed contact in the housing, and housed in the housing and brought into contact with the fixed contact. And a trip device which detects an abnormality and separates the movable contact from the fixed contact, wherein the terminal plate is exposed to the outside of the housing and holds a terminal portion in which electric wires are brought into contact with the fixed contact. And a contact holding portion interposed between the terminal portion and the contact holding portion, the projecting direction of the contact holding portion from the connecting portion is in an upward direction, and the contact holding portion is disposed on the mounting surface side rather than the terminal portion. In the housing, the housing is closer to the mounting surface side than the terminal portion. It is characterized in that a vent hole for communicating an external space and a space in which the fixed contact is accommodated in each other is provided.

In the circuit breaker, the ventilation hole is preferably provided at a position where the fixed contact is not exposed from above.

According to the present invention, since the contact holding portion protrudes above the connecting portion, even when water is submerged in the housing through the electric wire connected to the terminal portion, the water does not proceed from the connecting portion to the contact holding portion. That is, compared with the case where the contact holding part protrudes below the connection part, water resistance is improved. Moreover, since the ventilation hole is provided in the mounting surface side rather than the terminal part of a terminal board, compared with the case where the ventilation hole is provided in the side farther from a mounting surface than a terminal part, water resistance is improved in the point that water is hard to invade a ventilation hole.

1 is a cross-sectional view showing an embodiment of the present invention;
2 is a cross-sectional view showing a conventional example.

EMBODIMENT OF THE INVENTION Hereinafter, the most preferable form for implementing this invention is demonstrated, referring drawings.

In this embodiment, as shown in FIG. 1, two sets of fixed contacts 11 and 12 and movable contacts 21 and 22 and respective movable contacts 21 and 22 are respectively fixed fixed contact points when an abnormality is detected. The trip device 3 separated from 11 and 12 and the box-shaped housing 4 which accommodated each said part are provided. The housing 4 faces a predetermined surface (left side in FIG. 1) on an approximately vertical mounting surface (not shown, for example, the inner bottom of the distribution panel), and the other predetermined surface (upper surface in FIG. 1). Facing upward, it is fixed relative to the mounting surface. Hereinafter, up, down, left and right will be described with reference to FIG. 1.

The first terminal 61 to which the other end of the electric wire 5 which one end is connected to the power supply (not shown) is connected to the upper end part of the housing 4 is hold | maintained. Moreover, the 2nd terminal 62 to which the other end of the wire (not shown) which one end was connected to the load is connected to the lower end part of the housing 4 is hold | maintained. The first terminal 61 is electrically connected to an upper fixed contact (hereinafter referred to as "first fixed contact") 11, and the second terminal 62 is a lower fixed contact (hereinafter referred to as "second fixed contact"). 12) electrically connected thereto.

Each of the movable contacts 21 and 22 is provided on the right side of the upper end and the left side of the lower end of the movable contact 311 made of a metal plate that is vertically long and has a thickness direction in the horizontal direction. The movable contact 311 is integrated with the molding 312 which consists of synthetic resins, for example by insert molding, and comprises the rotor 31. As shown in FIG. The rotor 31 is rotatably supported about an axis perpendicular to the ground of FIG. 1 with respect to the housing 4. As the rotor 31 rotates from side to side with respect to the housing 4, the movable contacts 21, 22 are brought into close contact with the corresponding fixed contacts 11, 12, respectively. In the state where each of the movable contacts 21 and 22 is in contact with the corresponding fixed contacts 11 and 12, respectively, the first terminal 61 and the second terminal 62 are the fixed contacts 11 and 12 and the movable contact ( 21, 22, movable contacts 311, and the like, and are electrically connected to each other.

The trip device 3 has a handle 32, an electromagnet device 33, and an image current transformer 34 that protrude to the right side of the housing 4 and receive a manipulation force and are rotatable with respect to the housing 4. The electromagnet device 33 consists of an electromagnet 331 fixed to the housing 4 and a magnetic body, and has a contactor 332 driven by the magnetic force of the electromagnet 331. The electromagnet apparatus 33 operates, for example, when a ground fault is detected by the video current transformer 34 or when an overcurrent flows between the second fixed contact 12 and the second terminal 62. The handle 32 and the electromagnet device 33 (pole 332) are each connected to the rotor 31 via an appropriate link (not shown). When an abnormality such as a ground fault or an overcurrent is detected, the electromagnet device 33 is operated so that the rotor 31 is driven to rotate in the counterclockwise direction in FIG. 1, so that each movable contact 21 or 22 is fixed, respectively. The electrical circuit between the terminals 61 and 62 is disconnected from the contacts 11 and 12. In addition, by rotating the handle 32 manually, the rotor 31 can be rotated to open and close an electric circuit between the terminals 61 and 62. Since the trip device 3 as described above can be realized by a known technique, detailed illustration and description are omitted.

Moreover, in the housing 4, the recessed part 41 is provided in the outer surface of the upper side of the movable range of the 1st movable contact 21, and the inner peripheral surface of this recessed part 41 mutually has the inside and the exterior of the housing 4 mutually. The vent hole 42, which is a through hole for communicating, opens. That is, the ventilation hole 42 is provided in the position which does not expose the 1st fixed contact 11 when viewed from the upper side. In addition, the through direction of the ventilation hole 42 is a horizontal direction (left direction of FIG. 1 and the ground) which is a direction intersecting in the direction (almost up and down direction) in which the first fixed contact 11 and the ventilation hole 42 line up. Orthogonal direction). The vent hole 42 serves as a gas passage generated at the time of contact opening.

Moreover, between the movable range of the 1st movable contact 21 and the ventilation hole 42, the some which divides the arc which generate | occur | produces between the 1st movable contact 21 and the 1st fixed contact 11 at the time of contact opening ( In FIG. 1, three arc extinguishing plates 71 are arranged.

Further, an arc extinguishing body 8 is provided below the movable range of the second movable contact 22 (that is, the position where the fixed contacts 11 and 12 are inserted between the vent holes 42). It is arranged. The arc body 8 is made of a material that generates gas when heated. In other words, when an arc occurs between the second movable contact 22 and the second fixed contact 12, arc extinguishing is achieved by the gas generated by heating the extinguishing body 8 by the arc. As the material of the arc body 8, for example, a melamine resin or a polyamide-based resin containing magnesium hydroxide can be used.

Here, the first fixed contact 11 is held by the terminal plate 9 made of a conductive material. The terminal plate 9 is exposed from the upper side to the outside of the housing to constitute a part of the first terminal 61, a contact holding portion 92 holding the first fixed contact 11, and a terminal portion ( The connecting portion 93 is interposed between the 91 and the contact holding portion 92. The 1st terminal 61 is holding | maintaining the electric wire 5 in the state which contacted and conducted to the terminal part 91 of the terminal board 9. As a structure of such a 1st terminal 61, well-known terminal structures, such as a screw terminal, can be employ | adopted suitably, for example.

Further, the terminal portion 91 protrudes upward from the right end of the connecting portion 93, and the contact holding portion 92 protrudes upward from the left end of the connecting portion 93.

According to the said structure, since the contact holding part 92 protrudes above the connection part 93, even when water infiltrates into the housing 4 through the wire 5 connected to the terminal part 91, It is difficult for water to travel from the connecting portion 93 to the contact holding portion 92. That is, compared with the case where the contact holding part 92 protrudes below the connection part 93, waterproofness is improved.

Moreover, since the ventilation hole 42 is provided in the mounting surface side (left side in FIG. 1) rather than the terminal part 91 of the terminal board 9, it ventilates to the side (right side in FIG. 1) farther from the mounting surface than the terminal part 91. Compared with the case where the hole 42 is provided, the water resistance is improved in that the water is difficult to infiltrate the ventilation hole 42.

Moreover, since the ventilation hole 42 is provided in the position which does not expose the 1st fixed contact 11 when viewed from above, the ventilation hole 42 is provided in the position which exposes the 1st fixed contact 11 when viewed from the upper side. Compared with the case, the water soaked from the vent hole 42 is hard to reach the 1st fixed contact 11 or the 1st movable contact 21, and water resistance is improved.

In the case where the housing 4 is divided into a plurality of spaces, the vent hole 42 may be in communication with a space in which the fixed contacts 11 and 12 are stored among the plurality of spaces.

3: trip device
4: Housing
5: wire
9: terminal board
11: first fixed contact (fixed contact)
21: first movable contact (movable contact)
42: vent hole
91: terminal portion
92: contact holding part
93: connection

Claims (2)

A housing fixed to the mounting surface,
A terminal plate made of a conductive material and held by the housing to hold a fixed contact in the housing;
A movable contact housed in the housing and accessible to the fixed contact point;
A trip device for detecting an abnormality and separating the movable contact from the fixed contact;
The terminal plate has a terminal portion exposed to the outside of the housing and in contact with a wire, a contact holding portion for holding a fixed contact in the housing, and a connection portion interposed between the terminal portion and the contact holding portion,
The projecting direction of the contact holding portion from the connecting portion is in an upward direction,
The contact holding portion is disposed on the mounting surface side from the terminal portion,
The said housing WHEREIN: The ventilation surface which is provided in the said mounting surface side rather than the said terminal part in communication with the space outside the said housing and the space where the said fixed contact was accommodated in the said housing is mutually provided, It is characterized by the above-mentioned.
Circuit breaker. The method of claim 1,
The vent hole is provided at a position where the fixed contact is not exposed from above.
Circuit breaker.

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