4130 Lockout Slide 2 Position 2 Pole C-SeriesFeatures:. 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 you to chemicals including di(2-ethylhexyl)phthalate (dehp) which is known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.