Molded case circuit breaker

Abstract

The invention discloses a molded case circuit breaker, which comprises a casing, the casing is provided with a traction assembly, an adjustment screw, a bimetal sheet and a static iron core, the adjustment screw is fixedly connected to the bimetal sheet, and the static iron core is fixed to the bimetal sheet Connection, the traction assembly includes an instant draw bar and a delay draw bar, the instant draw bar includes a moving iron core and a fixed shaft, the position of the moving iron core corresponds to that of the static iron core, and the fixed shaft and the housing are axially fixed , the delay drawbar is set on the instant drawbar and the delay drawbar can move along the setting direction of the instant drawbar, and the position corresponding to the adjustment screw on the delay drawbar is provided with a slope interacting with the adjustment screw, The invention provides a molded case circuit breaker provided with a delay draw bar and an instantaneous draw bar, the delay draw bar and the instant draw bar are independent of each other, so as to achieve the effect of not affecting each other when adjusting the functions of the instant release and the delay release Purpose, to facilitate factory commissioning of molded case circuit breakers.

Description

technical field [0001] The invention relates to a circuit breaker, more specifically, to a molded case circuit breaker. Background technique [0002] The molded case circuit breaker can automatically cut off the current after the current exceeds the trip setting. The molded case circuit breaker includes a casing made of plastic insulators and a control component installed inside the casing. Molded case circuit breakers usually include overload protection and There are two functions of short-circuit instantaneous protection and overload delay protection, that is, the double gold plate is deformed through heat conduction. When the circuit breaker is overloaded, overheating will cause the double gold plate to bend and deform, thereby triggering the rotation of the drawbar to realize tripping. The tripping mechanism is usually provided with a sloped adjustment rod on the drawbar, and the horizontal position of the adjustment rod is adjusted through the knob, so that the distance...

AI Technical Summary

Problems solved by technology

[0003] Molded case circuit breakers in the prior art usually only have one draw bar, the upper part of the draw bar is provided with an adjustment rod at the position corresponding to the adjusting screw, and the lower part of the draw bar is provided with a moving iron core. Due to the reason of the type design, the adjustment of instantaneous tripping and delayed tripping will affect each other. The debugging of the circuit breaker is a very troublesome process, resulting in low production efficiency, and it is difficult to ensure the accuracy of instantaneous tripping and delayed tripping. If the instantaneous tripping function and delayed tripping function are not adjusted properly, it will easily affect Working performance of later molded case circuit breakers in use

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