NJBK9 series motor protection relay (hereinafter referred to as “Pro-tecter”) is used for overload protection, locked rotor protection, phase failure protection, three-phase unbalance protection, grounding protection and PTC temperature protection for AC electromotors of a frequency of 50Hz with a rated insulation voltage of up to 690V and a rated operating current of 1A-200A during long-term and discontinuous operation. This protector is provided with RS485 interface and 4-20MA current loop transmitter interface for network communication and performs remote monitor & control on the motor and fault query through opper computer. This protecter is usually used to combine with AC contactor. Standards: IEC 60947-4-1.
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