Novatek-Electro UBZ-304 3 - 350 kW Motor Protection Relay

UBZ-304 Numeric electric motor protection device is designed for protection of asynchronous LT motors having power of 3 to 350 kW (5A – 630A). UBZ-304 performs the following protection types for electr...

UBZ-304 Numeric electric motor protection device is designed for protection of asynchronous LT motors having power of 3 to 350 kW (5A – 630A). UBZ-304 performs the following protection types for electric motors: -over-current protection in phases; -ground fault protection (zero-sequence current); -phase current asymmetry (negative-sequence current); -for exceeding negative-sequence current factor to negative-sequence voltage factor; -thermal overload; -undercurrent protection in phases (dry-run); -delayed starting (rotor blocking); -overheating of windings (RTD inputs); -minimum line voltage; -maximum line voltage; -line voltage imbalance (negative sequence voltage protection); -improper phase sequence; -decreasing of mains frequency lower that setting; -for increasing of mains frequency higher that setting; -minimum insulation resistance of the motor winding; -motor phase loss (protection is operated when the motor current is disabled in one (two) phase).

For each type of protection, it is possible to permit and prohibit the load automatic reset. The unit provides for electric equipment protection by means of a magnetic starter (contactor) coil control