What happens to mag stick relays when the coil is de-energized?

What happens to mag stick relays when the coil is de-energized?

• A. Hold last position energized.
• B. Return to rest state
• C. Move to center
• D. Oscillate

Answer: (A)

Mag-stick relays are latching relays. They use a permanent magnet to hold the armature in one of two stable positions. When the coil is energized, the armature moves to a particular contact position; once the coil is de-energized, the permanent magnet keeps it in that last position instead of returning to a neutral/rest position. To change state, a pulse of opposite polarity (or a specific drive sequence) is applied to flip the latch. Because of this latch, the relay “remembers” its last position after power is removed and will stay there until another energizing pulse changes it. It does not automatically return to rest, move to center, or oscillate.

Mag-stick relays are latching relays. They use a permanent magnet to hold the armature in one of two stable positions. When the coil is energized, the armature moves to a particular contact position; once the coil is de-energized, the permanent magnet keeps it in that last position instead of returning to a neutral/rest position. To change state, a pulse of opposite polarity (or a specific drive sequence) is applied to flip the latch. Because of this latch, the relay “remembers” its last position after power is removed and will stay there until another energizing pulse changes it. It does not automatically return to rest, move to center, or oscillate.