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Three-phase voltage-sensitive relays

Three-phase voltage-sensitive relays are designed for protecting three-phase voltage equipment from impermissible circuit voltage surges, phase breaks, phase imbalance, phase adherence, and phase sequence violation

Three-phase voltage-sensitive relays

Three-phase voltage-sensitive relays are designed for protecting three-phase voltage equipment from impermissible circuit voltage surges, phase breaks, phase imbalance, phase adherence, and phase sequence violation. The relays are effectively utilized for protection of refrigerating, compressor, air-conditioning, and other equipment with electric motor loads. Also used in devices that require continuous monitoring of circuit voltage quality, availability and phase content, e.g. in automatic transfer schemes.

 

All voltage monitoring relays have the resetting ratio (hysteresis) of about 5V. The effective range of our relays is 30-150% of rated voltage. In case of extreme undervoltage and voltage spikes, the relay tripping acceleration is activated. The voltage monitoring relays provide for automatic load energizing after voltage parameters recovery within predetermined time relay.  The relays are compact in size and weight. All relays are mounted onto standard DIN-rail.

 

Thу voltage sensitive relays are connected parallel to load and control the magnetic starter coil; thus the use of voltage-sensitive relays is practically independent of the load wattage. The voltage monitoring relay outputs have two groups of independent contacts (one pair of contacts is normally closed, and the other one – normally open),switching load up to 5A.

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