Contactors

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Contactor

Contactors and Overload Relays are suitable for a large variety of applications in building and in industry such as motor control, heating and ventilating, air conditioning, pumping, lifting equipment, lighting, process power factor correction.

 

Some application of contactors:

1- Start/stop circuit

I. Power & control circuit

Start stop circuit from 2 position

II. Operation


a. When Press S1 (start pushbutton)
b. Contactor k1 operate ,then contact k1 will be normally close
c. Motor will operate ,until press S0 (stop pushbutton).

 

III. PLC ladder diagram

start stop ladder diagram

2- Start/stop circuit from 2 position

I. Power & control circuit

Start stop circuit from 2 position

II. Operation


a. When Press S3 or S4 (start pushbutton)
b. Contactor k1 operate ,then contact k1 will be normally close
c. Motor will operate, until press S1 or S2 (stop pushbutton).

 

III. PLC ladder diagram

start stop ladder diagram

3- Reverse motor with stop circuit

I. Power & control circuit

Start stop circuit from 2 position

II. Operation

 

 

III. PLC ladder diagram

Reverse motor with stop circuit ladder diagram

4- Star/Delta Circuit

I. Power & control Circuit

star delta circuit

star delta  control circuit

II. Operation

 


III. PLC ladder diagram

star delta  ladder diagram