The AP12-0 is Airpax™ AP series fully sealed, magnetic circuit protector that combine power switching and accurate, reliable circuit protection with inverse time delays and trip free features. Unlike a thermal circuit protector, the AP does not change its trip current over a wide temperature span. One of the most important features of this protector is the “trip free” action, which means the circuit will not remain closed in the presence of an overload even though the handle is held in the ON position. The delay mechanism senses the fault and the contacts open. Waterproof panel integrity is provided by an “O” ring bushing seal and a silicon rubber gland within the bushing/handle assembly. Salt spray testing per MIL-STD-202, Method 101, Test Condition B, with no evidence of corrosion, electrical or mechanical damage. Typical applications include communication, navigation and aircraft instrumentation, radar and power supplies.