M39019/03-255 is a two-pole magnetic low-power sealed circuit breaker with trip-free operation designed for defense and aerospace applications. The device is rated for a maximum voltage of 50 V dc and 240 V ac at 60 Hz and 400 Hz, with a current rating of 15.0 amperes and time delay category B. It features a maximum resistance of 0.009 ohms at dc, 0.009 ohms at 60 Hz, and 0.010 ohms at 400 Hz, with maximum wattage losses not exceeding 3.0 watts. The circuit breaker supports high inrush capability of 800 percent at 60 Hz and dc, and 1,400 percent at 400 Hz, and is housed in a sealed configuration with panel-mount capability. This device is commonly used in military and aerospace electrical systems where reliable overcurrent protection and compact sealed design are essential.