The NK motor protection relays from NewElec's N Series are designed to protect motors in various LV applications. The relays are fitted with a 4 to 20 mA loop to indicate percentage motor load current as well as having four potential free normally-open contact outputs to indicate the fault status of the control panel-mounted LEDs. This enables interfacing to PLCs or other control circuits that may be situated in a separate control centre.
Protection is provided against thermal overloads, locked rotor, jam/running stall, and phase unbalance/loss conditions. The relays provide 250 mA earth leakage protection with a dedicated changeover contact as a shunt tripping facility for MCCBs, irrespective of the fault current level.
The NK relays have a PLC reset facility from 24 to 220 V a.c. or d.c. They also offer local and remote reset facilities, a thermal LED bar graph display and a fail-safe mode with memorised thermal status of the motor and trip fault conditions.
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