The AP12-1-71-153 is a two-pole, fully sealed magnetic circuit protector designed for DC applications with short time delay characteristics and a nominal current rating of 15 amperes. This hydraulic magnetic circuit protector combines accurate, reliable circuit protection with inverse time delays and trip-free features, maintaining consistent trip current performance across a wide temperature span unlike thermal protectors. The unit features a DC series resistance of 0.006 ohms and operates with trip time characteristics of 0.200 to 7 seconds at 125% rated current, 0.055 to 0.950 seconds at 200% rated current, and faster response at higher overload levels. The protector weighs approximately 1.8 ounces (49 grams) per pole and is available with toggle-type terminals for panel mounting. This device is ideal for applications requiring precise circuit protection in DC power systems, industrial control circuits, and equipment where reliable overload and short-circuit protection with predictable time delays is essential.