Moulded case circuit breaker with residual current protection

Abstract

The invention relates to a moulded case circuit breaker with residual current protection. The circuit breaker comprises a base, a contact arc extinguish module set, an operation mechanism, a residual current release device, a cover assembly, a clapboard, a thermal magnetic release device set, an insulation piece, a zero sequence current mutual inductor and an electric leakage control assembly, wherein the contact arc extinguish module set is fixed on the base; the operation mechanism is fixed on the base and the contact arc extinguish module set; the residual current release device is installed on the contact arc extinguish module, and is connected with the electric leakage control assembly through a lead wire; all phases of the thermal magnetic release device set are arranged on the contact arc extinguish module set and the base through the zero sequence current mutual inductor; the electric leakage control assembly is arranged between the thermal magnetic release device set and the zero sequence current mutual inductor; the electricity taking lead wires of the electric leakage control assembly are respectively connected with three phases of the thermal magnetic release device set; and the cover assembly is installed on the base. Compared with the prior art, the circuit breaker has the advantages of reasonable structure, compact volume, safety, reliability and the like, is convenient to install.

Description

Technical field [0001] The invention relates to a circuit breaker, in particular to a plastic case type circuit breaker with residual current protection. Background technique [0002] A plastic case circuit breaker with residual current protection (CBR for short). Its working principle is that when a leakage fault occurs in the system, the vector sum passing through the zero sequence current transformer is not equal to zero, and the leakage current (I △ ), when the leakage current (I △ ) When the leakage action current setting value of CBR is reached, the residual current release will act quickly to cut off the power protection circuit. [0003] At present, there are roughly two forms of CBR: one is integral CBR, that is, the residual current protection function is fully integrated inside the molded case circuit breaker; the other is split CBR (such as Figure 5 ), the leakage function is made into a separate residual current protection module N. When the residual current protection...

AI Technical Summary

Problems solved by technology

However, the internal structure of the molded case circuit breaker with double breakpoints is compact, so the leakage function is modularized and made into a residual current protection module separately. After the leakage module, the length of the whole split CBR is significantly increased

The current two forms cannot meet the needs of users who have high requirements on the short-circuit breaking capacity of CBR and have certain requirements on the volume of CBR.

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