CN-224232612-U - High-insulativity direct-current miniature circuit breaker

CN224232612UCN 224232612 UCN224232612 UCN 224232612UCN-224232612-U

Abstract

The utility model provides a high-insulativity direct current miniature circuit breaker which comprises a circuit breaker body, wherein a circuit breaker shell arranged on the circuit breaker body comprises a shell body positioned in the middle and terminal shells positioned at two ends of the shell body, a switch brake is arranged on the front side of the shell body, a live terminal is arranged in the terminal shell, an insulation structure is arranged on one side, far away from the shell body, of the terminal shell, and an insulation protection cover is arranged on the terminal shell and covers the live terminal and the front end face of the insulation structure. According to the utility model, the creepage distance between the electrified terminals of the direct current miniature circuit breaker can be effectively increased by increasing the thickness of the terminal shell, so that a larger insulation distance is provided for the interphase of the direct current miniature circuit breaker, the safety performance of a product is more excellent, and the insulation protection cover is provided, so that the insulation reliability of the direct current miniature circuit breaker is further improved.

Inventors

WANG JING
LIU BIN
XI JIANWU
MA JINGYUAN
DU KANG
MA TIEFENG
JIANG WEIXIN
JU YOUMING

Assignees

二一三电器(上海)有限公司
天水二一三电器集团有限公司

Dates

Publication Date: 20260512
Application Date: 20250428

Claims (8)

1. The direct current miniature circuit breaker with high insulativity is characterized by comprising a circuit breaker body, wherein a circuit breaker shell (3) of the circuit breaker body comprises a shell body positioned in the middle and terminal shells positioned at two ends of the shell body, and a switch gate (2) is arranged at the front side of the shell body; The terminal housing internally mounted has electrified terminal (1), one side that the casing main part was kept away from to the terminal housing is provided with insulation structure (4), install insulating protection casing on the terminal housing, insulating protection casing covers the preceding terminal surface of electrified terminal (1) and insulation structure (4) simultaneously.
2. The high-insulation direct-current miniature circuit breaker according to claim 1, characterized in that the live terminal (1) is mounted on the side of the insulation structure (4) facing the housing body; The creepage path between the charging terminals (1) arranged side by side is from one charging terminal (1), extends to one end of the insulating structure (4) far away from the shell body along the surface of the corresponding insulating structure (4), and extends to the other charging terminal (1) through the surface of the insulating structure (4) corresponding to the other charging terminal (1).
3. The high-insulation direct-current miniature circuit breaker according to claim 1, characterized in that the height dimension of the insulation structure (4) is not lower than 10.5mm.
4. The high-insulation direct current miniature circuit breaker according to claim 1, wherein the circuit breaker housing (3) is of a left-right split type structure and comprises a first housing (6) and a second housing (7), and the first housing (6) and the second housing (7) are mutually spliced to form the circuit breaker housing (3).
5. The high-insulation direct current miniature circuit breaker according to claim 1, characterized in that the upper and lower ends of the circuit breaker housing (3) are both provided with a first insulation shield (5); The width of the first insulation protection cover (5) is matched with the terminal shell, and the edge of the first insulation protection cover (5) is provided with a closed structure acting on the side part of the terminal shell.
6. The high-insulation direct-current miniature circuit breaker according to claim 1, characterized in that the circuit breaker body is a single-pole circuit breaker or a multipole circuit breaker comprising a plurality of circuit breaker housings (3) arranged side by side.
7. The high-insulation direct current miniature circuit breaker according to claim 6, characterized in that the upper end of the circuit breaker housing (3) is fitted with a first insulation shield (5); The width of the first insulation protection cover (5) is matched with the terminal shell, and the edge of the first insulation protection cover (5) is provided with a closed structure acting on the side part of the terminal shell; The lower end of the breaker shell (3) is provided with a second insulation protection cover (8), and the width of the second insulation protection cover (8) is matched with the total width of the plurality of parallel breaker shells (3); the edge of the second insulation protection cover (8) is provided with a closed structure acting on the side part of the terminal shell of the breaker shell (3) positioned at the head end and the tail end of the plurality of breaker shells (3); and a through cavity is formed between the second insulating protective cover (8) and the plurality of breaker housings (3) and is used for accommodating a series circuit between the plurality of breaker housings (3).
8. The high-insulation direct-current miniature circuit breaker according to claim 1, characterized in that the terminal housing is integrally formed with the insulating structure (4).

Description

High-insulativity direct-current miniature circuit breaker Technical Field The utility model relates to the technical field of circuit breakers, in particular to a direct current miniature circuit breaker with high insulation. Background Along with global energy transformation, applications of clean energy such as solar energy, wind energy and the like are increased, and new energy power generation and grid connection requirements are continuously increased. Meanwhile, new infrastructure fields such as data centers, charging facilities and rail transit are rapidly developed, and the demand for small-sized direct current circuit breakers is increasing. In the electric automobile charging pile, the direct current miniature circuit breaker can prevent the charging equipment and the vehicle from being impacted by current abnormality, and in the intelligent household power distribution system, the direct current miniature circuit breaker is also started to be applied to meet the intelligent development requirement. The miniature breaker terminal power distribution electrical appliance is applied to a low-voltage power distribution system, is arranged at a circuit terminal and is used for distributing, protecting and the like of related circuits and electric equipment. The DC miniature circuit breaker has higher requirements on insulation performance than the AC miniature circuit breaker because of voltage characteristics, arc extinction requirements, polarity effects and other reasons, the insulation scheme of most DC miniature circuit breakers on the market at present is equal to that of the AC miniature circuit breaker, the creepage distance of the AC miniature circuit breaker is generally about 10mm, the requirements of DC voltage and use environment cannot be met, and the safety and reliability cannot be ensured. Patent document with publication number CN218647861U discloses a direct current breaker, including the circuit breaker casing, circuit breaker casing upper end be equipped with the protection casing that is used for protecting the circuit breaker casing, the protection casing on fixedly connected with busbar, circuit breaker casing upper end be equipped with power supply terminal, circuit breaker casing lower extreme be equipped with load terminal, power supply terminal and load terminal between be equipped with switch module, the other explosion chamber that is used for protecting switch module that is equipped with of switch module, power supply terminal respectively with busbar and switch module's input electric connection, load terminal and switch module's output electric connection. This solution relates to an improvement of the arc extinguishing capability and does not relate to an improvement of the insulation solution, unlike the direction of improvement of the present utility model. Disclosure of utility model In view of the defects in the prior art, the utility model aims to provide a direct current miniature circuit breaker with high insulation. The utility model provides a high-insulativity direct current miniature circuit breaker, which comprises a circuit breaker body, wherein a circuit breaker shell arranged on the circuit breaker body comprises a shell body positioned in the middle and terminal shells positioned at two ends of the shell body, and a switch gate is arranged at the front side of the shell body; The terminal housing internally mounted has electrified terminal, one side that the casing main part was kept away from to the terminal housing is provided with insulation structure, install insulating protection casing on the terminal housing, insulating protection casing covers the preceding terminal surface of electrified terminal and insulation structure simultaneously. Preferably, the charging terminal is mounted on a side of the insulating structure facing the housing main body; The creepage path between the electrified terminals arranged side by side is from one electrified terminal, extends to one end of the insulating structure far away from the shell body along the surface of the corresponding insulating structure, and extends to the other electrified terminal through the surface of the insulating structure corresponding to the other electrified terminal. Preferably, the height dimension of the insulating structure is not less than 10.5mm. Preferably, the breaker shell is of a left-right split structure and comprises a first shell and a second shell, and the first shell and the second shell are mutually spliced to form the breaker shell. Preferably, the upper end and the lower end of the breaker shell are provided with first insulating shields; The width of the first insulation protection cover is matched with that of the terminal shell, and the edge of the first insulation protection cover is provided with a closed structure acting on the side part of the terminal shell. Preferably, the breaker body is a single pole breaker or a multipole breaker comprising a plurality