Blue Sea 4125 AC A-Series Circuit Breaker Lockout Slide [4125]4125 AC A Series Circuit Breaker Lockout Slide Features: Allows only 1 double pole AC circuit breaker to be activated at a time Guarantees that AC power from 2 sources (shore power and genset or inverter) will not be mixed Fits all World or A Series and Rocker double pole circuit breakers Uses circuit breaker mounting screw holes. Requires no special panel modification Includes mounting screws WARNING: This product can expose you to chemicals