The M39019/04-336 is a military-qualified magnetic circuit protector from the Airpax™ AP-MIL series, produced in accordance with MIL-PRF-39019 to provide combined power switching and reliable circuit protection. As a hydraulic-magnetic protector, its trip current does not change significantly over a wide temperature range, ensuring consistent performance. This fully sealed device features a trip-free action, which prevents the circuit from being held closed during an overload condition, and is designed to withstand harsh environments. Common applications for this type of protector include communication systems, navigation equipment, aircraft instrumentation, radar, and power supplies.