Let's assume that I want to use a 20-amp GE AC circuit breaker in a DC circuit. So, after testing it in a DC circuit with some loads and ammeter + clamp DC amp meter I find the current at which the breaker trips. Let's assume as an example this is 45 amps. So, is it possible to use the AC circuit breaker in the DC circuit on a permanent basis? I've seen a YouTube clip where a person is using an AC 6-amp 230V breaker with a DC circuit and it tripped at 13 amps when loaded.
Are there any significant safety hazards with this technique? I mean I was thinking since it's the current that matters maybe these breakers can be used with 6V/12V/24V circuits where the currents are generally going to be drawing only under 20 amps in the above mentioned case while using, but in a short circuit scenario, the current will be in 35A to 55A range thus causing the breaker to trip.
Update: I had these two breakers from the old panel in my storeroom. What you guys said is very true. It seems to be quite dangerous to use them in DC too. I have a high-current 12/24V supply capable of 35-amp output. But I’ll only be using it under 20 amps mostly. I build these supplies from UPS transformers. So, I tried to connect the three supplies and I had built to the GE breaker, in short, to see its response only 2 seconds power ON. The first one was with the biggest transformer from a 2000VA UPS. It had very thick low voltage windings (10AWG likely) and shoutings the AC low voltage caused the breaker to trip in 39-41ms. With another transformer from a 700VA UPS from low voltage AC side, it tripped at around 1.17s and finally from a 300VA UPS transformer low voltage AC the breaker did not trip. Now trying the first two transformers I’m dead short on the breaker via a 50 Amp rectifier (Imax peak 400A briefly) I was surprised the breaker didn’t trip even after 2 seconds and I immediately gave up the DC breaker idea. I’ll put the breaker on the AC low-voltage high-current side for safety and add a 400-amp rectifier to protect in case of a dead short.