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Does the Square D 8903LX require momentary or constant power to latch and unlatch

Product Line:
8903 type L Lighting Contactors

The coils for the 8903 mechanically held lighting contactor require momentary power to latch and unlatch. A pulse will need to be sent to the latch coil to pull the device in, and a separate pulse should be sent to the unlatch coil to drop the device back out. 
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