How to understand AC contactor? — CNAISO AC Contactor

1. What is an AC contactor?

AC contactors often use three arc extinguishing methods: double-break electric arc extinguishing, longitudinal seam arc extinguishing and grid arc extinguishing. It is used to eliminate the arc generated by the moving and static contacts during the opening and closing process. Contactors with a capacity of more than 10A have arc extinguishing devices. The AC contactor also has auxiliary components such as reaction spring, buffer spring, contact pressure spring, transmission mechanism, base and terminal.

2. How AC Contactors Work?

The working principle of the AC contactor is to use the electromagnetic force to cooperate with the spring force to realize the connection and disconnection of the contacts. The AC contactor has two working states: de-energized state (release state) and electrified state (action state). When the attracting coil is energized, the static iron core generates electromagnetic suction, the armature is pulled in, and the connecting rod connected to the armature drives the contact to move, so that the normally closed contact breaker contactor is energized; when the attracting coil is powered off, the The electromagnetic attraction disappears, the armature is re-opened, the normally open contacts are closed and released under the action of the position spring, all the contacts are reset accordingly, and the contactor is in a power-off state.

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