The 545 series is a three or four pole, double make, normally open, dual coil mechanical latch

contactor rated up to 7.5 HP. It will hold its last energized position indefinitely without requiring any power itself. Contacts change state when the appropriate coil is energized. This makes the 545 series especially well suited to battery driven devices, and to any application where power consumption or coil heating must be minimized. For PDF click Here.