KT3400T This one of few field installable trip device provide by the factory. 2 and 3 pole device are availabe to choose from. When installing trip unit, be sure bolts are seated to specified torque. CAUTION: Breaker will not work properly and will arc, flash and burn. Trip units not properly installed are not warranteed by the factory or breakeroutlet. Not all electricians or maintenance personelle are trained with this type of installations. Ask for assistance if needed.