2.16.2 CT Wiring Diagram

 

This diagram shows an example using an 816 series controller and contactor for a CT input.

 

 

 

 

Note: a burden resistor value 10Ω is mounted inside the controller.

 

To prevent a buildup of high voltages at the output of the CT if it is disconnected from the controller, it is recommended that a voltage limiting device be connected directly across the output of the CT. A suitable device is two back to back zener diodes, rated between 3 and 10V at 50mA, as shown.