M39019/05-249 is a three-pole magnetic low-power sealed trip-free circuit breaker designed for aerospace and military applications per MIL-PRF-39019/5H. This circuit breaker features a current rating of 10.0 amperes with time delay type B, and is rated for maximum voltages of 50 V dc and 240 V ac at 60 Hz and 400 Hz. The device exhibits high inrush capability of 800 percent at 60 Hz and dc, and 1,400 percent at 400 Hz, with maximum resistance/impedance of 0.018 ohms (dc), 0.021 ohms (60 Hz), and 0.024 ohms (400 Hz). The sealed design with trip-free mechanism ensures reliable protection in demanding environments, and the approximately 150-gram weight makes it suitable for weight-sensitive aerospace systems. Applications include aircraft electrical systems, avionics power distribution, and other military/aerospace equipment requiring compact, reliable overcurrent protection.