The synchro-check relay can be used to assist in the semi-automatic parallelling of two AC power systems . The volt-free relay contacts change state when the voltage level, phase relationship and frequency are within the selected synchronising limits . Connecting two electrical systems that are not closely matched can cause expensive damage and disturbance to the electrical system. Using this relay will ensure that damage will not occur . Other features of this device are : - Single phase or three phase, 3 or 4 wire - Live and dead bus versions - Adjustable setpoint - LED trip indication - Volt free relay contacts Bornika is the exclusive agent of Ziegler company in the fields of consultation , sales and distribution of power industry products including Synchro-Check (parallelling) Relay .
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