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The circuit breaker comprises the nonmagnetic housing, a hermetic contact and a constant magnet. In it there is a nonmagnetic cover, an emitting diode with a protective diode, a resistor, the first and the second magnetically soft material plates, a magnet holder and an indicator.
Circulator with permanent magnet(s) and ferrite block(s) having magnetic characteristics to provide thermostable operation over predetermined temperature range