Voltage & Frequency (Combined Under/Over)
The 250 series combined voltage and frequency protectors provide continuous surveillance of the monitored circuit. When the voltage or frequency moves outside the set point limit for longer than the time delay, the respective relay will operate giving an alarm, control or tripping signal. An illuminated LED indicates when the relay is energised. This protector can be used to protect against over and under-speed and over and under-voltage.
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