Transient surge suppressor and alarm signal circuit

Details Transient surge suppressor and alarm signal circuit Transient surge suppressor and alarm signal circuit

H - Electricity

01

C

317/24

H01C 8/04 (2006.01) H02H 9/04 (2006.01)

Patent

CA 2011309

ABSTRACT OF THE DISCLOSURE An alarm circuit for a transient voltage suppression circuit for protection of equipment using alternating current power is shown and described. This device utilizes a pair of diodes having the same terminals (polarity) connected to a node to which a resistor provides an AC voltage. The diodes conduct during one half cycle in normal operation, and the node is at a virtual ground when both diodes conduct. When a fuse from one diode to ground opens, current no longer flows and the voltage at the node rises as the other diode conducts and applies a voltage to resistors and an alarm input. There is also disclosed a suppression circuit which provides for isolation of the ground from neutral in the event of failure of the varistor.

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