M39019/01-219 is a one-pole magnetic low-power sealed trip-free circuit breaker designed for aerospace and military applications per MIL-PRF-39019/1H. This circuit breaker is rated for a current of 2.0 amperes with time delay B characteristic, and operates at maximum voltages of 50 V dc and 240 V ac at 60 Hz and 400 Hz. The device features a maximum resistance of 0.40 ohms at dc and 60 Hz, and 0.50 ohms at 400 Hz, with a maximum wattage loss not exceeding 3.0 watts. It incorporates a sealed design with trip-free operation, spherical keyway terminals, and panel-mount configuration with 0.610 inch diameter main terminals. The circuit breaker is commonly used in aircraft electrical systems, avionics, and other defense applications where reliable overcurrent protection and compact sealed construction are essential.