NewElec’s NI series motor protection relays protect motors in various LV applications from 5–550 A. They are designed with multiple mounting options and all the protection features required to protect S1 rated TEFC lightweight LV metric motors. NI relays allow the protected motor to run within its designated temperature limits, defined by the user according to the motors thermal class and maximum load.
Accurate overload protection is ensured with additional protection provided against sustained cyclic overload, locked rotor and phase unbalance/loss conditions. Available in three models, the relays offer earth leakage protection with a dedicated changeover trip contact to ensure no attempt is made to clear any earth related faults through the main contactor.
The thermal memory on the NI Series is designed to IEC 60255-8 (Class 5 to 30) to prevent excessive jogging or multiple starts. Local or remote reset facilities are offered and user friendly descriptive calibration settings are available in seconds, amps or % CT ratio. The compact relays are suitable for door, chassis or module mounting and descriptive fault indication is provided by LEDs.
Typical applications are found on conveyor motors with soft start or DOL starting, fan motors with extended run up time, crusher motors, compressor motors with cyclic loading and general motor protection requiring a small footprint.
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