Miniature circuit breaker, Easy9, 4P, 40 A, C curve, 6000 A. There are many types of Circuit Breakers Single-Pole,two-pole that are designed to protect house wires from overheating or causing a short-circuit. The circuit breaker is for use with dishwashers, waste disposals, refrigerators, washing machines, televisions and window air conditioners. Triple and four-pole circuit breakers allso used mainly in industry.