Abstract :
A WHOLE new family of quick-thinking, fast-acting relays which operate in a single cycle, and base their decisions not on the customary time elements, but upon comparison of instantaneous values has appeared this year. Together with highspeed circuit breakers, they represent the modern view that continuity of service is best assured by cutting off troubles as fast as possible. All these Westinghouse relays act in one-sixtieth of a second — three to ten times as fast as has been customary.
