Electronic type molded case circuit breaker with residual current protection function

Abstract

The invention discloses an electronic type molded case circuit breaker with a residual current protection function. The molded case circuit breaker comprises a circuit breaker base, an incoming terminal arranged on a power side of the circuit breaker base, a switching mechanism arranged in the middle of the circuit breaker base, a tripping mechanism arranged in the middle of the circuit breaker base, a zero sequence current transformer arranged on a load side of the circuit breaker base, three phase line pole current transformers arranged on the load side of the circuit breaker base as well asa load side wiring terminal assembly arranged on the load side of the circuit breaker base. Main circuit conductive connecting parts, penetrating through the center of the zero sequence current transducer, of A, B and C poles are copper connecting plates formed once, excessive connecting and welding are avoided, parts, extending into the zero sequence current transducer, of all connecting platesare wrapped and insulated to prevent short circuit, and the discharge capacity, temperature rise, connection reliability and mounting convenience are improved.

Description

technical field [0001] The invention belongs to the technical field of low-voltage electrical appliances, and in particular relates to an electronic molded case circuit breaker with residual current protection function. Background technique [0002] In the existing molded case circuit breakers with residual current protection, they are generally derived from thermal magnetic tripping type molded case circuit breakers, and are equipped with zero-sequence current transformers for detecting the residual current of the main circuit. The conductive connector of the main pole circuit passes through the zero-sequence current transformer and then connects with the load side circuit. Therefore, it not only has the overload and short circuit protection function of the thermal magnetic tripping type, but also has the residual current protection function, thus protecting the load. Electric safety. [0003] The existing four-pole residual current protection circuit breaker is limited by...

AI Technical Summary

Problems solved by technology

[0004] 1. Bolts are used to connect the front and rear conductor parts. During use or transportation, it is easy to cause the bolts to loosen, which will lead to an increase in contact resistance or even a phase-off or zero-off fault, resulting in low or impossible detection of residual current.

[0005] 2. Multiple conductor parts are excessively connected and welded together, and the internal resistance increases, resulting in an increase in temperature rise

[0006] 3. The processing technology is complicated, the assembly is troublesome, which affects the assembly efficiency, and the manufacturing cost is high

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