GCR1-F
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Motor Control Device Magnetic latching contactors GCR1-F series magnetic latching contactors Magnetic latching contactors of both block and bar mounted types are fitted with a special electromagnet which enables them to remain in the "On" position when the coil is no longer energised. Applications The special properties of magnetic latching contactors make them suitable for a large number of applications. Retention of the sequence memory in automatic control equipment in the event of loss of control voltage. Energy saving, since the source of supply to the coil does not need to supply current when the contactor is latched in the closed state. Change of state from "Closed" to "Open" by current signal through the coil. Unaffected by mains interference. Utilisation of contactors beyond their breaking capacity, as operations are performed off-load. Contactors are silent in the latched position. Refineries, power stations, excitation circuits. Contactors remaining in the closed state for long periods. Examples: refineries, power supplies, low voltage distribution. Selective opening control. No unwanted opening and closing of the main power poles. Current carrying at voltages up to 1000 Volts. Operation of the electromagnet GCR1-F block contactors GCR1-F magnetic latching contactors are fitted with a double coil with 3 terminals comprising a latching winding and an unlatching winding. The 2 windings have a common point which can necessitate special wiring precautions when the latching supply is separate from the unlatching supply. The power supplies may be a.c. or d.c. For d.c. operation, the polarities indicated must be complied with. Operating precautions: the 2 windings must not be supplied simultaneously, a winding must not be supplied continuously, supply to the coils must be via pulsed contacts. Manual opening: if the control voltage is not present, the contactor can be unlatched manually. Selection guide for utilisation category AC-3 Rated operational current in AC-3 (q 55 ) 440V 500V 660V 690V Rated operational power (standard motor power ratings)