CN-122029629-A - Circuit breaker for wiring

Abstract

The invention discloses a circuit breaker for wiring. The circuit breaker for wiring is characterized in that the insulating performance of the housing is kept constant even if the interior of the housing is contaminated by the inflowing oxide. The circuit breaker for wiring according to an embodiment of the present invention includes a housing, a housing cover, and a plurality of base members. The shell cover covers the shell, and a plurality of base assemblies are accommodated in the shell. The base assembly has a base cover. The base cover is internally formed with a space to accommodate the fixed contact, the movable contact, and the arc extinguishing portion. An insulating coating portion is formed on an inner surface of the housing, the inner surface of the housing facing an outer surface of the base cover when the base cover is inserted into the housing. The insulating coating portion is formed by coating an inner surface of the case with an insulating material.

Inventors

• WU JINGHUAN
• JIN YONGHUAN

Assignees

• LS电气株式会社

Dates

Publication Date

20260512

Application Date

20240920

Priority Date

20231020

Claims (5)

1. 1. A circuit breaker for wiring, comprising: A housing; a housing cover covering the housing, and A plurality of base components accommodated in the shell; the base assembly is provided with a base cover, and a space is formed in the base cover to accommodate the fixed contact, the movable contact and the arc extinguishing part; An insulating coating portion is formed on an inner surface of the housing, the inner surface of the housing facing an outer surface of the base cover when the base cover is inserted into the housing; The insulating coating portion is formed by coating an inner surface of the case with an insulating material.
2. 2. The circuit breaker for wiring according to claim 1, wherein, The insulating coating portion is formed on an inner surface of at least one of a bottom portion of the housing, one side wall portion of the housing, and the other side wall portion of the housing.
3. 3. The circuit breaker for wiring according to claim 1, wherein, The insulating coating portion is formed of any one or a mixture of more than one of silicone, polyurethane, polyamide, acrylic and epoxy materials.
4. 4. The circuit breaker for wiring according to claim 3, wherein, The insulating coating portion is formed by coating in a spray manner or a brush manner.
5. 5. The circuit breaker for wiring according to claim 1, wherein, The thickness of the insulating coating part is 15-50 mu m.

Description

Circuit breaker for wiring Technical Field The present invention relates to a circuit breaker for wiring having a case coated with an insulating material. Background A circuit breaker for wiring (MCCB: molded Case Circuit Breaker) is an electrical device that cuts off power supply in order to prevent an electrical accident when an abnormal current such as leakage current or overcurrent occurs as one type of circuit breaker. A general circuit breaker for wiring includes a fixed contact and a movable contact inside. During a period in which a normal current, which is a non-abnormal current, flows, the fixed contact and the movable contact are in contact with each other, so that electricity can be conducted. If an abnormal current occurs, the fixed contact and the movable contact are separated, and the current is cut off. When the fixed contact and the movable contact are separated, an arc (arc) is generated by an abnormal current flowing through the fixed contact and the movable contact. The generated arc is discharged to the outside of the circuit breaker for wiring after the arc extinguishing (extinguish) process. The generated arc may be defined as a flow of high temperature, high voltage electrons. Oxide is generated inside a Housing (Housing) accommodating the fixed contact and the movable contact due to an arc of high temperature and high voltage, and flows out of the Housing and into the inside of a Case (Case) of the circuit breaker for wiring. The oxide flowing into the inside of the case contaminates the inside of the case, degrading the insulating performance of the case. In order to prevent contamination by oxides and the like, U.S. patent publication No. 2013-033474 discloses that two members (pieces) forming the arc chute housing (interrupter housing) 300 are fastened with bolts and nuts, and an adhesive is used on the outer surfaces of the two members. However, U.S. publication No. 2013-033474 does not disclose a solution for preventing deterioration of insulation performance of the Base 102 in the case where contaminants such as oxides flow into the inside of the Base 102. Here, the base 102 corresponds to the casing of the circuit breaker for wiring. Therefore, even if the interior of the casing of the circuit breaker for wiring is contaminated with contaminants such as oxides, it is necessary to keep the insulating performance of the casing constant. Disclosure of Invention Problems to be solved The invention aims to provide a wiring circuit breaker which can keep the insulation performance of a shell constant even if the interior of the shell of the wiring circuit breaker is polluted by an inflow oxide. Technical proposal for solving the problems The above object of the present invention is achieved as follows. The circuit breaker for wiring according to an embodiment of the present invention includes a housing, a housing cover, and a plurality of base members. The shell cover covers the shell, and a plurality of base assemblies are accommodated in the shell. The base assembly has a base cover. The base cover is internally formed with a space to accommodate the fixed contact, the movable contact, and the arc extinguishing portion. An insulating coating portion is formed on an inner surface of the housing, the inner surface of the housing facing an outer surface of the base cover when the base cover is inserted into the housing. The insulating coating portion is formed by coating (coating) an inner surface of the case with an insulating material. Specifically, the insulating coating portion is formed on an inner surface of at least one of the bottom portion, one side wall portion, and the other side wall portion of the housing. Specifically, the insulating coating portion is formed of any one or a mixture of more than one of silicone (silicon), polyurethane (polyurethane), polyamide (polyamide), acrylic (acrylic), and epoxy (epoxy) materials. Specifically, the insulating coating portion is formed by coating in a spray (spay) manner or a brush (brush) manner. Specifically, the thickness of the insulating coating portion is 15-50 μm. Effects of the invention The circuit breaker for wiring according to the embodiment of the present invention is such that the inside of the case of the circuit breaker for wiring is coated with an insulating material, whereby the case can be protected from the oxide even if the inside of the case is contaminated with the inflowing oxide, and the insulating performance of the case can be kept constant. In the wiring breaker according to the embodiment of the present invention, when oxide does not flow into the casing of the wiring breaker, the inner surface of the casing is insulated and coated, so that the insulation performance of the casing is further improved. Drawings Fig. 1 is a diagram of a wiring breaker showing an example of an embodiment of the present invention. Fig. 2 is a view showing the housing and a plurality of base assemblies with the housing cove