What is "quenchers"

Usage examples of "quenchers".

This was the red-light nerve center of the new ship, busy and tightly fitted, a place where a thousand adjustments had been bolted on where they were needed, from circuit breakers to flow quenchers, some just to see if they helped at all.

Elfric looked at him for a moment as one scared, and then ran his ways down the hall, which now was growing noisy with the hurry and bustle of the quenchers of the fire, to whom had divers others joined themselves.