Motor Protection Relay - 4 Pole/3 Pole, 380-415v Ac, 5a To 630a | Overload Protection, Remote Monitoring, Modbus Communication, Temperature Monitoring

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Product Details:
Minimum Order Quantity 1 Piece
Voltage TypeAC
Voltage (V)380 - 415V AC
Number of Poles4 Pole, 3 Pole
ApplicationAC motor protection and remote monitoring
Current (Amps)5A to 630A
Power (Watts or HP)3.5 HP to 500 HP
Motor Voltage380 - 415V AC
Motor BrandAny
Speed (Rpm)Any
Relay TypeMotor Protection Relay
PhaseThree Phase
BrandNOVATEK ELECTRO

UBZ-304 is designed for protection of induction motors with power of 2.5 to 315 kW (4HP to 500HP) in case of using the external standard current transformers with 5A output current. UBZ can be operated in networks both with insulated and dead grounded neutral. The unit is flush mount design version. UBZ provides continuous monitoring of mains voltage parameters, current values of the phase (line) currents of three-phase electrical equipment for 415V, 50Hz, and checking the resistance values of motor insulation.

UBZ-304 provides protection for AC electrical motors in case of:
- low quality network voltage (unacceptable power surges, phase failure, incorrect phase sequence and phase "coincidence", the imbalance of phase/line voltages, the reduction in the network frequency lower than the set one and (or) the increase of network frequency higher than the set value);
- mechanical overloads (symmetrical overload in phase/line currents);
- the threshold crossing of the negative-sequence current;
- imbalance of phase currents without overload associated with the insulation fault inside motor and/or the power cable (the comparison of current unbalance factor according to inverse sequence with voltage unbalance factor according to inverse sequence);
- the torque failure on the motor shaft ("dry running" for pumps) - protection based on the minimum starting and/or operating current;
- motor delayed start or rotor blocking; - extremely low isolation between the stator and the motor housing (pre-startup check);
- ground fault of the stator winding during operation
- earth leakage current protection;
- motor thermal overload;
- overheated windings (temperature of windings is determined using the motor built-in temperature transmitters or the temperature of the housing when using the external temperature probes, RTD type).

Further UBZ provides for electric motors control:
- using analog inputs "0-20 mA" and "0-10 V";
- using remote control channels (built-in RS-232 and RS-485 interfaces);
- by buttons on the front panel of UBZ.

Communication UBZ provides:
- parameters control and transmission by RS-485 interface using MODBUS Protocol,
- parameters control and transmission by RS-232 interface.

Availability of addtional programmable output relay allows for additional operation mode:

Star-delta switching
Delayed start power-on (for example, cascade motor starting)
Remote signaling system relay (annunciation)

Documentation for this device