Chint NJBK7-50T Motor Protection Relay

• NJBK7 series motor protection relay (hereinafter referred to

• as protector) is used to provide overload, locked rotor, phase

• failure, three-phase current unbalance, ground and PTC

• temperature protection for AC motors with a frequency of

• AC 50Hz, a rated insulation voltage of up to 690V and a

• rated operational current of 1A-800A that operate

• continuously or intermittently. The protector uses flexible

• Rogowski coil to acquire current and features wide setting

• current range, high accuracy and convenient installation.

• The protector has RS485 interface and 4mA-20mA analog

• transmission interface, permits network communication and

• can realize remote monitor and control and fault inquiry of

• motors by means of upper computer. The protector is

• genenrally used in combination with AC contactor.

• Standards: IEC 60947-4-1.

Features:

• Structural features

• Split mounting;

• LCD display, key setting;

• Has start delay function;

• Has fault memory function, permits inquiry of fault record;Has RS485 interface, supports MODBUS protocol, permits network communication;Has 4mA-20mA analog output interface;

• Has two groups of output contacts, 1Z protection contact and 1H auxiliary contact, and permits autotransformer reduced voltage

• starting and star-delta starting;

• Power consumption: ≤3VA.

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