The Pro/Tran Q Series features 1-inch interchangeable circuit breakers. A 30A double-pole circuit breaker and a 20A double-pole circuit breaker, to handle heavier loads on the generator side, are included on each model. The balance of the circuit breakers are single-pole 15A.
The 15A circuits in the transfer switch may be connected to 15A or 20A circuits in the load center. Circuits are limited to 15A only on the generator side of the switch. Circuit breakers in the transfer switch are easily replaced. The spaces containing the 30A and 20A double-pole circuits may be replaced with 15 or 20A single-pole breakers if desired.