oil switch

oil switch

[′ȯil ‚swich]
(electricity)
A switch whose contacts are immersed in oil in order to suppress the arc and prevent the contacts from being damaged.

oil-immersed switch

A switch which is immersed in a special insulating fluid, usually oil.
References in periodicals archive ?
* If you're not getting fuel or the smoke generator Stops when you hit the fog oil switch, check the supply line inside the fuel can.
"I winched it onto the back of my truck immediately," he recalls, chucking because even then he suspected the tractor wasn't really "dead." Bob knew Wheel Horses came equipped with a low oil switch, which prevents the operator from turning the tractor on if the oil is low.