Family Life What is breaker lockout? How do you use a circuit breaker lockout? https://www.youtube.com/watch?v=t1o0o8sNDjI How does a circuit breaker lockout work? https://www.youtube.com/watch?v=HmwKuTgKrKI What is a circuit lockout? [′läk‚au̇t ‚sər·kət] (electronics) A switching circuit which responds to concurrent inputs from a number of external circuits by responding to one, and only one, of these circuits at any time. Related Posts:A circuitbreaker can be changed.Why doesn't my electrical service panel have a main breaker switch? My electrical panel has no main breakers, is that a problem?How To A circuit breaker should be installed.What is the maximum Amp Ratings for 70, 80, 100, 125, 150, 200, 400, 600 Amp wire and breaker chart?