Double-breakpoint molded case circuit breaker

Abstract

The invention relates to a double-breakpoint molded case circuit breaker which is a molded case circuit breaker with double breakpoints connected in series in the same direction. A double-breakpoint contact structure of the molded case circuit breaker is of a double-breakpoint structure in which movable contact rods of two single breakpoints are connected in series to form a pole; the breaker of the structure has the advantages of reliable contact, high electric stability and easiness in regulation of contact parameters of a single-breakpoint breaker, also has the advantage of good arc extinguishment effect of the double-breakpoint breaker and is simple, reasonable in structure and capable of effectively improving the short circuit breaking capability of the molded case circuit breaker. According to the double-breakpoint molded case circuit breaker disclosed by the invention, when the breaker is subjected to short circuit breaking, the arc extinguishment capability of the double-breakpoint structure is theoretically double that of the single-breakpoint structure, and the double-breakpoint structure is beneficial for improving the short circuit breaking capability of the breaker.

Description

technical field [0001] The invention relates to a plastic case circuit breaker with double breakpoints, belonging to the technical field of low-voltage electrical appliances. Background technique [0002] Molded case circuit breakers are capable of connecting, carrying and breaking currents under normal circuit conditions, and can also be connected, carried for a certain period of time and A switching device for breaking current. [0003] Usually, the contact system of molded case circuit breakers adopts a single breakpoint structure, which has the advantages of reliable contact, high electrical stability, and easy adjustment of contact parameters. However, when it breaks the short-circuit current, the burning and wear of the contacts are very serious. As a result, the single-break point contact system molded case circuit breaker has very limited ability to improve short-circuit breaking. At present, the molded case circuit breaker has a contact system with a double breakp...

AI Technical Summary

Problems solved by technology

The invention patent with the patent number ZL200410000924.8 discloses a modular multi-pole double-breakpoint molded case circuit breaker. Two pairs of moving and static contacts share the breaking current, so the breaking capacity is greatly improved. In theory, its breaking capacity is twice that of the single break point contact device. However, this structure makes the lateral width of the circuit breaker relatively large, which affects the use of the product.

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