Circuit Breaker Lockouts • Padlocks and lockout tags not includedPrevent accidental engagement of electrical circuits during maintenance. Single-Pole Breaker LockoutsUsed to lock out circuit breakers with a standard toggle switch. Snap-on models work on breakers with holes in the side of the switch. Bar clamp, clamp-on, or slide-on models work on switches with or without holes. Use cleats with clamp-on lockout to assure positive restraint for breakers with long sliding switch throws.