Protect electrical systems from overload and short circuits. Manual reset. Voltage range of 12-24V Narva Panel Mount Circuit Breaker 30A Manual 55330 This 30A Panel Mount Circuit Breaker is a Type III manually resetting breaker with a 10.5mm diameter opening for ease of mounting. The device has a voltage range of 12-42V. Narva Circuit Breakers are designed to keep you and your electrical system safe, protecting electrical circuits from potential damage that could otherwise occur from overload events and short circuits. SPECIFICATIONS Size: 74 X 48mm Input volt range: 12-42V Amperage: 30A