What's the difference between relay and contactor?

The contactor has an arc extinguishing device, but the relay does not.

Relays are used for signal detection, transmission, conversion or processing. Its on-off circuit current is generally very small, and it is generally used to control weak signals in control circuits. Contactors are used to connect or disconnect the main circuit.

Relays are generally used in electrical control circuits to expand the contact capacity of miniature or small relays, so as to drive larger loads. Contactors are used in the main circuit, and the main contacts can have interlocking contacts to indicate the opening and closing of the main contacts.

Contact mode of relay

1, the moving type (normally open, H type) coil is disconnected when it is not energized, and closed after it is energized.

2. The two contacts of the dynamic break type (normally closed, D type) coil are closed when the coil is not energized, and the two contacts are disconnected after the coil is energized.

3. The conversion type (Z type) is the contact group type. The contact group * * * has three contacts, namely the moving contact in the middle and the static contact at the top and bottom. When the coil is not energized, the moving contact and one stationary contact are disconnected and the other is closed; After the coil is energized, the moving contact moves, so that the original disconnected state is closed and the original closed state is disconnected, thus achieving the purpose of conversion.