Trip Coil Design

[drax]

Any ideas on a design for a AC trip coil that has to release
a 2 lb. load.

Asa the spec calls out , they want an AC shunt trip to work down to 13VAC on 125V P.U. basis, which can also reach 190VAC L-G.

the latch load is around 2 lbs. Therefore, any trip device must develop in excess of 2 lbs of force to trip the breaker. They do not want to use a DC coil, any thoughts on a way to do this without having an extra device in this circuit.

thanks

 

[waross]

Any way you can charge a capacitor off the line side and use that to fire the trip coil? Calculate the resonant frequency and spec it as an AC coil with a 1/2 cycle normal operating duty.