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Single-winding, latching type: This type has one coil that serves as both the set and reset coil depending on the direction of current flow. When current flows through the coil in a forward direction it serves as a set coil; when the current flows in the reverse direction it functions as a reset coil. Dual-winding, latching type: This latching relay has two coils: set and reset.
It accepts a momentary impulse to one coil to latch and a second impulse to the other coil to release and can retain the ON or OFF states even when a pulsating voltage is supplied or when the voltage is removed.