A single pole lockout, CB01 requires a switch breaker with a recessed hole in it.
The CB02, is a double pole lockout and requires the breakers to be connected with a cross bar for lockout application.
A single pole lockout, CB03 does not require a switch breaker with a recessed hole in it.
Our double pole circuit breaker lockout CB04 will fit most major brands of electrical circuit breakers. If this lockout does not fit, it may be returned.