Title: Apparatus for detecting loss of AC power supply and loss of current

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Abstract: Apparatus for detecting loss of AC power supply for an electrical conductor and loss of current through the electrical conductor when the power supply is connected thereto comprises voltage responsive means operable to produce a voltage present signal when the power supply is connected to the electrical conductor and a predetermined voltage is present across the conductor and a voltage absent signal when the predetermined voltage is not present across the conductor, and current responsive means operable to produce a current present signal when a predetermined current is flowing through the conductor and a current absent signal when the predetermined current is not flowing through the conductor. Fault-signalling means is connected to the AC power supply for operation thereby, and means responsive to the simultaneous presence of a voltage present signal and a current present signal and to the simultaneous presence of a voltage absent signal and a current absent signal causes the power supply to operate the fault-signalling means in a no-fault indicating sense. The absence of the AC power supply or the simultaneous presence of an absent signal and a present signal causes the fault-signalling means to indicate a fault condition.


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