Molded case circuit breaker with static tripping unit

Details Molded case circuit breaker with static tripping unit Molded case circuit breaker with static tripping unit

H - Electricity

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H01H 71/02 (2006.01) H01H 71/12 (2006.01) H01H 71/24 (2006.01) H01H 75/10 (2006.01) H01H 9/52 (2006.01) H02H 7/04 (2006.01)

Patent

CA 1173085

ABSTRACT OF THE DISCLOSURE: Multi-pole circuit breaker having a molded case and a static tripping unit, comprising: current transformers associated with each pole of the circuit breaker and deliver- ing signals representing the value of the currents flowing through the poles, an electronic processing device of said signals which delivers a tripping signal in the case of an overload or a short-circuit, a tripping coil controlled by said tripping signal for tripping said circuit breaker. A compartment is provided in the molded case and is sealed off from the rest of the inside of the molded case. Ventilation holes are provided in the case for communication of said compartment with the outside of the molded case, the elec- tronic processing device being inserted in the compartment so that it is protected from the circuit-breaking gases generated inside the case and is cooled down by the air circulating through the ventilation holes, the current transformers being housed in the rest of the inside of the molded case.

404473

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