Blue Sea 4131 Lockout Slide 2 Position 3 Pole C-Series [4131]4131 Lockout Slide 2 Position 3 Pole C Series Features: Allows only 1 of a pair of double pole or triple pole AC circuit breakers to be activated at a time Guarantees that AC power from 2 sources (power company and genset or inverter) will not be mixed Fits all double pole or triple pole C Series circuit breakers Uses circuit breaker mounting screw holes Requires no special panel modification Includes mounting screws WARNING: This product can expose