Low Voltage Residential Generators Standby Power (Generators) - Generators Accessories are Residential Enclosures Standby Power (Generators). Sub BrandStandby Power Systems Type Manual Transfer Interlock Kit Application For use onUltimateTM and Rock Solid load centers 150 amp and higher to connect the main breaker to a 2-pole circuit breaker Standard UL/NEMA 1/3R Amperage Rating 225A Mounting Flush or Surface Length 6.5 Width 7.6 Height 16.6