Testing Motor Protection Circuit Breaker

It doesn't take much resistance to limit the current to 100 amps with only 5 volts. It could be anything and every thing in the circuit.

Thank you for your reply. Will you please be more specific. If you want any more data I can give. Your answer is evasive "it could be anything and everything in the circuit" means nothing. Be very specific if I have to check any specific aspect.

pscraja

First try the injection set with directly shorting the terminals and see you can increase the current towards the high ampere rating (1000 A) of the set – do it carefully so that the high ampere current stays only for short time. This test tells you that the injection set is working or not.

If the injection set works, then make sure you connected the set's terminal to the relay properly with sufficient torque.

Then blame the relay.

- MS

pscraja

Realize that with only 0.10 ohms the limit of the amps is I = E/R = 5/0.1= 50 amps. With a resistance of 0.01 ohms the max amperage is 500 amps. That's why I said it could be anything. Since the unit is only putting out 500 amps the unit resistance is only 0.05 ohms. That will be hard to eliminate.