The AP12-1-62-203 is a two-pole, series trip hydraulic magnetic circuit protector that combines power switching with reliable overcurrent protection. This model is configured with hook terminals, a nominal current rating of 20 amperes, and is designed for operation in 50/60Hz circuits. It features a long time delay to prevent nuisance tripping from temporary inrushes and is fully sealed for panel integrity and environmental resistance. A key safety feature is its trip-free action, which ensures the circuit opens during an overload even if the handle is held in the ON position. Common applications include communication systems, navigation equipment, aircraft instrumentation, radar, and power supplies.