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AC1 - These type of contactors are used for Non-inductive or slightly inductive loads they are used for Heaters which are resistive loads.


AC2 - These type of contactors are used in Starting of slip-ring motors


AC3 – They are particularly used for Starting of squirrel-cage motors and switching off only after the motor is up to speed.

AC4 - Starting of squirrel-cage motors with inching and plugging duty. Rapid Start/Stop
.
AC11 - Auxiliary (control) circuits i.e. they don’t have power contacts.

AC-6a- Switching of Transformers.

AC-6b- Switching of Capacitor banks.

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