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Synchroscope
Selco M8100 series Littelfuse

The M8100 Synchroscope provides illuminated indication of the phase and frequency difference between voltages on two separate AC systems, e.g. a generator and a busbar. The M8100 will also indicate whether or not the two systems are on voltage. The M8100 is also available in a version with a built-in relay for automatic closure of the circuit breaker (Synchro Check Relay). The voltage and frequency are adjusted by the operator to roughly match the values required, and the unit will provide a closing signal to the circuit breaker at phase accordance.

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