A static switch that provides a four-millisecond break when transferring upon inverter failure is sensing the voltage being supplied to the switch from the inverter. Once an inverter failure occurs, the static switch senses the loss of voltage and initiates a transfer. The sense-to-transfer initiation time is approximately four milliseconds. A zero-break static switch is also available but only with a CVT (constant voltage transformer) type inverter. The zero-break static switch on the CVT inverter monitors the square wave output of the bridge, prior to the CVT transformer. If the square wave should deteriorate, indicating an inverter failure; the sense circuit in the switch will initiate a transfer, with the stored energy in the CVT transformer used to accomplish the zero-break.
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