What is the common maximum rated working voltage of AC contactors?

The common rated maximum working voltages of AC contactors are 220V, 380V, 660V and 1140V; usually, the maximum working voltage is the rated insulation voltage, and the electrical clearance and creepage distance of the electrical appliance are determined accordingly; a contactor The device often specifies several rated operating voltages and lists the corresponding rated operating current or control power.

The common rated maximum working voltages of AC contactors are 220V, 380V, 660V and 1140V.

Usually, the maximum working voltage is the rated insulation voltage, and the electrical clearance and creepage distance of the electrical appliance are determined accordingly. A contactor often specifies several rated working voltages, and also lists the corresponding rated working current (or control power). When the rated operating voltage is 380V, the rated operating current can be approximately considered equal to twice the rated control power (KW).

According to my country's standards, the rated voltage should be selected from the following standard number system:

DC: 12, 24, 36, 48, 60, 72, 110, 125, 220, 250, 440V;

AC: 24, 36, 42, 48, 127, 220, 380, 660, 1140V.

Extended information:

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 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.

The AC contactor uses the main contact to control the circuit and the auxiliary contact to conduct the control loop. The main contact is usually a normally open contact, while the auxiliary contact often has two pairs of normally open contacts and normally closed contacts. Small contactors are often used as intermediate relays in conjunction with the main circuit. The contacts of the AC contactor are made of silver-tungsten alloy, which has good electrical conductivity and high temperature ablation resistance.

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