I am essentially intending to use this Schneider Electric A9F44120 MCB as an automatic brake for my wind turbine, which has an output of 25A @ 24Vac.
Can I use the normal 240Vac MCB for 24Vac?
Will it affect the current sensing ability or switching ability of the C.B? any suggests will be highly appreciated.
Thanks
Electronic – 240v AC Circuit Breaker for 24v AC
circuit breaker
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Its not about voltage it's about current. Old style circuit breakers toggle off when the current going through them is enough to trip a relay and work like a fuse.
"Earth leakage circuit breakers" also watch the neutral line. Theory being what ever go's UP must come Down. That is the current going out of the live wire does not match the current returning on the neutral wire, there must be a leak so ground somewhere... However it's a bit of a misnomer, the current could actually 'LEAK' back to the panel through some other neutral path too if the wiring is not correct.
The newest standard also detects electrical arcing in the system.
It's an interesting type of circuit breaker, a Hydraulic-Magnetic. See the catalog here.
Anyway, the third pin is actually for a trip coil. Which is a coil when energized, will trip the circuit breaker. Ther are most often found as clip-on units for rail circuit breakers. But this one has it integrated.
Best Answer
Whatever amp rating is on your breaker will hold true up to its voltage limit of 240 VAC. It is sensing only AC current, not the line voltage, and it does not care what the AC source is at long as it does not exceed the 240 VAC limit.
24 VAC is a bit low but enough so the breaker contacts behave correctly. They may not conduct current if the source voltage is just a few volts AC. If you have a datasheet on the breaker it should state minimum and maximum VAC limits.