contact rating for switchgear coil
contact rating for switchgear coil
(OP)
I am adding a new pressure switch to operate a close coil for a 4 kV breaker. The coil is rated 6 amps at 125 VDC. One switch that I am considering is rated at 10 amps resistive, 5 amps inductive at 125 VDC. The switch will pick up the close coil typically 3-4 times per month. A seperate breaker interlock typically opens the close coil circuit. Is above described switch acceptable?





RE: contact rating for switchgear coil
The closing coil of a circuit breaker is an inductive load, so the rating of your relay is inadequate for this use.
RE: contact rating for switchgear coil
"Normal" breaker control circuits would have momentary contacts doing the closing, and this is what I suggest that you consider - use the pressure switch to operate a one-shot auxiliary relay circuit, with a closed time of say 0.25 sec. The final control contact should be rated to interrupt the closing coil current in case the breaker hangs up (there are small control relays available to switch 10A @ 125 VDC).
RE: contact rating for switchgear coil