Why do you want pulsed DC instead of continuous DC? What is the current rating of the circuit breaker (is it very low)? Even a small (relative) current will allow you to get a fairly accurate voltage measurement across the contact (as long as you employ correct 4-wire voltage measurement techniques).
Also, why are you doing this in the first place (is it for maintenance or measuring the contact resistance of a new circuit breaker)? The contact resistance data should be available from the supplier.
What's the application and what size circuit breaker are you talking about?
How to build pulsed current DC power supply?
Re: How to build pulsed current DC power supply?
