4131 Lockout Slide 2 Position 3 Pole C-SeriesFeatures:Allows only 1 of a pair of double pole or triple pole AC circuit breakers to be activated at a timeGuarantees that AC power from 2 sources (power company and genset or inverter) will not be mixedFits all double pole or triple pole C-Series circuit breakersUses circuit breaker mounting screw holesRequires no special panel modificationIncludes mounting screwsWARNING: 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.