Airpax AP series magnetic circuit protectors offer a robust solution for power switching and circuit protection. Unlike thermal protectors, the AP maintains a consistent trip current across a wide temperature range. Available in DC, 50/60Hz, or 400Hz versions with adjustable delays, these protectors are suitable for communication, navigation, aircraft instrumentation, radar, and power supplies. The 'trip-free' action ensures the circuit opens even when the handle is held in the ON position. The AP/UP series, with UL and CSA certification, is approved for various voltage and current ratings. AP-MIL protectors meet MIL-PRF-39019 standards and undergo rigorous testing for quality assurance. Multi-pole configurations offer flexibility for complex circuit protection needs, including series, shunt, and relay combinations.