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What do AC-3 and AC-4 of AC contactors mean ?

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Examples of Category Code and Typical Use

AC-1 contactor is used to control inductionless or slightly inductive load and resistance furnace.

AC-2 contactor is used to control starting and breaking of winding induction motor.

AC-3 contactor is used to control the starting and running of cage induction motor.

Class AC-4 contactors are used to control the starting, reverse braking, reverse operation and point movement of cage induction motors.

AC-5a contactor is used to control the on-off of discharge lamp.

AC-5b contactor is used to control the on-off of incandescent lamp

AC-6a contactor is used to control the on-off of transformer

AC-6b contactor is used to control the on-off of capacitor banks.

AC-7a contactor is used to control low inductive load of household appliances and similar uses.

AC-7b contactor is used to control the load of household motor

AC-8a contactor is used to control motor in sealed refrigeration compressor with manual reset overload release.

AC-8b contactor is used to control motor in sealed refrigeration compressor with automatic reset overload release.

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