Compactly built to fit over most circuit breaker switches in the off position, the universal 120/240 Circuit Breaker Lockout keeps the moving contact away from the stationary contact, breaking the circuit and preventing it from accidently being energized or turned on during servicing.
STOPOUT 120/240 Circuit Breaker... : Double Pole Breaker Lockout (For...
Part #:K-0557 3.33" x 1.75" Stopout® 120/240 Circuit Breaker Lockout Verified PurchaseGreat Device
This lockout is exactly what I needed. I tried 4 others and none of them worked.