Withdrawable air circuit breakers
Withdrawable air circuit breakers
(OP)
Can anyone guide me to good information regarding the "finger cluster" connections at the rear, where the ACB connects to the main busbars. I have a problem where they have failed and I want to change to a new technology. Someone has mentioned that this technology has failed in the past but I can't find any information.





RE: Withdrawable air circuit breakers
This whole episode lead to a better way of testing contact resistance both on the finger clusters and the contacts themselves. This new way uses the voltage drop across the subject "joint" when rated frame current is applied.
The Ductor method missed the "new" springs problem but was found with the voltage drop method.
Doug