M39019/01-218S is a one-pole magnetic low-power sealed trip-free circuit breaker designed for aerospace and military applications per MIL-PRF-39019/1H. The device is rated for a current of 2.0 amperes with standard time delay type A, and operates at maximum voltages of 50 V dc and 240 V ac at 60 Hz and 400 Hz. It features a maximum DC resistance of 0.40 ohms and impedance of 0.40 ohms at 60 Hz and 0.50 ohms at 400 Hz, with high inrush capability of 800 percent at 60 Hz and dc, and 1,400 percent at 400 Hz. The circuit breaker is housed in a sealed configuration with spherical keyway terminals and panel-mount design, weighing approximately 50 grams. This product is commonly used in aircraft electrical systems, avionics, and other mission-critical applications where reliable overcurrent protection and trip-free operation are essential.