Monitoring circuit for switch status in electrical power circuit - has switch coupled to additional AC source and circuit elements forming resonance circuit

摘要: An electrical switch (S) controls the connection of a load (L) to DC supply (G). When closed current flows through primary winding transformer (U). AC voltage (W), coupling capacitors (C1, C3), resistor (R) and limiting (Rb) are also coupled transformer. Together they form status monitoring circuit (US). The signal is superimposed on causes an induced component be transmitted by This produced resonance indicates status. may adapted for use with two series switches. ADVANTAGE - Allows monitored independently mechanical construction characteristic.