In article
,
whit3rd wrote:

On May 7, 9:46*am, Omicron wrote:
I need to have a Bridge Rectifier 250V 40a .....

Huh? That's a device that makes 10,000W of DC
power at relatively high voltage. It's not terribly SAFE
to do that; normal switches and fuses cannot
control such DC power. Is this for a flashing
strobe light to illuminate a stadium?

Whit-

Yes, 250 times 40 is 10,000. That doesn't mean the bridge is being used
to produce 10,000 watts.

Both voltage and current may represent peak values of a low duty-cycle
application. If the bridge feeds a capacitor filter, the voltage peaks
across any one of the diodes would be 2.83 times the AC RMS value. That
would be 88.3 VRMS in this case.

With a 2X margin, actual stress might be 44 VRMS and 20 Amps peak, or
880 Watts peak power. With a low duty cycle, it would be even less.
This wouldn't be unreasonable for many applications such as rapidly
charging the batteries in a hybrid automobile!

Fred