Closing Coil Failure in Vacuum Contactor
Closing Coil Failure in Vacuum Contactor
(OP)
The closing coils in a vacuum contactor are getting failed repeatedly. Latched type vacuum contactor, so there is continuous power supply to the closing coil.
Coil Voltage:110 V DC
The 110V DC is rectified DC from 110V AC. The Input to the rectifier is from a control transformer. The rectified DC has a smoothing capacitor. The capacitor has a rating of 150V, 220uF.
Does the filter can cause over voltage to the closing coil? or could the switching surges can cause the coil failure?
Any comments/experience.
Coil Voltage:110 V DC
The 110V DC is rectified DC from 110V AC. The Input to the rectifier is from a control transformer. The rectified DC has a smoothing capacitor. The capacitor has a rating of 150V, 220uF.
Does the filter can cause over voltage to the closing coil? or could the switching surges can cause the coil failure?
Any comments/experience.






RE: Closing Coil Failure in Vacuum Contactor
RE: Closing Coil Failure in Vacuum Contactor
RE: Closing Coil Failure in Vacuum Contactor
RE: Closing Coil Failure in Vacuum Contactor
Your transformer secondary voltage should be around the 80V AC mark to produce 110V DC. With that said, 220uF is a fairly small capacitor - how much current do the trip and close coils draw?
RE: Closing Coil Failure in Vacuum Contactor