consider a 240 V 16 A Miniatire Circuit Breaker :


is that 240 only the maximum voltage ??
that means - will it still be on if it were supplied by say 50 V? (withouth going over the 16 A obviously).
a typical case would be - a variac (variable transformer) controling a motor, having the mcb in between. (assume that the motor is freewheeling.)

thanks, steve


(btw im a new member here still getting used to the scene.)

 

You can always check the specs on the breaker to be sure, but the 240 volt rating is a guarantee that the device can interrupt an overcurrent at that level of voltage. It should operate fine in a 50 volt situation. If you have any doubts, add a fuse.

 

Thanks m8, your answer was clear.
(I asked this question coz i always get the rated voltage when i search in spec sheets,, never got any minimum voltage or so ...) but probably its fine - as u said. .

 

You run into minimum voltage ratings with automotive functions. That's why car fuses have 32 volt ratings. They will not guarantee clearing a higher voltage short, but will for the 12 volts in a car's electrical system. A 120 or 240 volt fuse may not interrupt a 12 volt fault.

That is fuses and not breakers, though.