Eaton / Cutler Hammer Plug-On Circuit Breaker Its Compact And Easy to Install Single pole AFCI Circuit breaker features thermal magnetic molded case for extra protection circuit breaker has a current rating of 20 amps and voltage rating of 120/240 Vac it has AIC rating of 10 kilo-amps it accommodates copper/aluminum wires of size 14 - 4 AWG it operates at a temperature of 60 or 75 deg c it is ideal for load center applications and protects wiring from overheating or short-circuits. circuit breaker is Ul 489 listed and Csa certified.