Fangrui Product Details Compatible Models: Generator interlock kit compatible with for /Cutler Hammer interlock kit for CH series 150 and 200 amp, ONLY for CH panels with TAN breakers where the area of main breaker is depressed, NOT for CH panels with PON breakers where the area of main breaker is flat or raised. Main Branch Breaker Space: Single handle horizontal throw left (on) to right (off) 1 1/2 inches spacing between main breaker and branch breakers. Safe and Reliable: Generator interlock kit for Cutler Hammer provide a safe and cost-effective way to backfeeding of your home electrical appliances by a portable generator. Ideal solution for power outages or emergency backup power to keep your home geared up and running safely. Easy Installation: Easy to connect the generator to for /Cutler Hammer electrical panel and the main breaker can never be on while the generator breaker is on. Moves smoothly when in operation and provide safety . Please note: the physical slightly color difference or difference, does not affect th