I think it is some sort of choke that limits current, and when the contacts close shorting out the three windings across from it, relay 71FX can then energize, which closes N.O contact for points 9 & 8 allowing the trip circuit to energize the 52X trip coil of the breaker.
Hitachi 20kw static exciter btw.
The contacts are 71F1-6 are apart of the protection circuit for the silicon rectifier cells.
Just reviewing some drawings and would like to know the exact term on what this is.
ElectricianTalk.com - Are you a Professional Electrical Contractor? If so we invite you to join our community and see what it has to offer. Our site is specifically designed for you and it's the leading place for electricians to meet online. No homeowners asking DIY questions. Just fellow tradesmen who enjoy talking about their business, their trade, and anything else that comes up. No matter what your specialty is you'll find that ElectricianTalk.com is a great community to join. Best of all it's totally free!
The topics covered on this site include activities in which there exists the potential for serious injury
or death. ElectricianTalk.com DOES NOT guarantee the accuracy or completeness of any information contained
on this site. Always use proper safety precaution and reference reliable outside sources before attempting any construction or remodeling