SM40 series thermo-magnetic MCCB ( for short hereafter), one of the SM40 series products, is a new-style one developed by this factory be means of the international advanced knowhow of design and manufacture theory, and suitable for the non-frequent conversion in the circuit of AC 50Hz, rated insulating voltage 800V, rated working voltage below 690V and rated working currentup to 2500A and the non-frequent starting of motors. The breakers have overload , short-circuit and under voltage protection devices so as to protect the circuit and the power equipment against damage.

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