The AP12-1-71-252 is a two-pole, series trip magnetic circuit protector designed for reliable overcurrent protection. It has a nominal current rating of 2.500 amperes and is compatible with DC, 50/60Hz, and 400Hz circuits. This device features a short time delay with a 135% minimum trip characteristic, combining power switching and accurate protection. Housed in a fully sealed case with hook terminals, it mounts via a bushing and two 6-32 threaded inserts. Its trip-free action and stable performance over a wide temperature range make it suitable for demanding applications like communication, navigation, and aircraft instrumentation.