How much silver does the contactor contact contain?

The silver contents of the high-current contacts are: 85%, 40%, and 30%. The low-current contacts are all made of alloy. AC contactors usually have two sets of auxiliary contacts, one pair of normally open and one pair of normally closed, used to form a logic circuit, such as a self-holding circuit, an XOR gate (interlock) circuit, a priority circuit, etc. The auxiliary contact capacity is usually small and used for control.

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 during the opening and closing process of moving and static contacts. Contactors with a capacity above 10A have arc extinguishing devices. AC contactors also have auxiliary components such as reaction springs, buffer springs, contact pressure springs, transmission mechanisms, bases and terminals.

Extended information

The working principle of the AC contactor is to use electromagnetic force and spring elastic force to realize the connection and disconnection of the contacts. The AC contactor has two working states: power-off state (release state) and power-on state (action state).

When the attraction coil is energized, the static iron core generates electromagnetic attraction, the armature is attracted, and the connecting rod connected to the armature drives the contact action, so that the normally closed contactor is in the energized state; When the attraction coil is powered off, the electromagnetic attraction disappears and the armature reopens, causing the normally open contacts to close and release under the action of the spring. All contacts are then reset and the contactor is in a de-energized state.

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