What Is a Latching Solenoid?
A latching solenoid (also called a magnetic latching solenoid or bistable solenoid) is a linear electromagnetic actuator that can hold its plunger in a fixed position with no electrical power applied. It uses a permanent magnet built into the magnetic circuit to "latch" the armature in place after a brief current pulse.
In plain terms: you give it one short pulse to pull the plunger in, and it stays there on its own. You give it a second pulse in the opposite direction to let it go. Between those two moments, the solenoid consumes exactly zero power.
