Types of electrical contactor

 TYPE OF CONTACTOR  PRACTICALLY USED  ELECTRICAL INDUSTRY 

Contactor are of four types 

1. AC1
2. AC2
3. AC3
4. AC4

AC1 

For the purely resistive load or slightly inductive load, we used the AC1 contactor. By which power factor lies between .1 to .5

For example, a heater, an electric bulb 

AC2 

We need a high starting torque at the starting time, so we use the AC2 type contactor according to the load's current rating.  

For example, a slip ring type induction motor

AC3  

AC3-type contactor is used where a constant torque is needed.

  For example, the Squirrel-cage induction motor, lift, and elevators 

In industry, 80 per cent of squirrel-type motors are used

AC4

where the inching operation frequently happens, or when switching on or switching off operation frequently happens. 

For example, in the packaging industry.