Sy wrote:

Hi.
Does anyone know where to find a replacement circuit breaker for a 6A
automotive battery charger?

The charger is from the '70's, a simple basic transformer and 2 diodes .
The circuit breaker is the type that automatically resets. The old one
was a little glass tube, but I've seen the type that are square with
threaded terminals too. Either one would work.

Thanks.
You need a BI metal circuit breaker..

Just go to your local auto parts store and get a
plug breaker used for power windows etc in the upper cars..