AP17-1-61-153 is a fully sealed magnetic circuit protector designed for DC circuit applications with a 15-ampere nominal current rating and short time delay characteristic. This single-pole unit features an auxiliary switch rated at 3.0 amperes at 120 VAC / 50 VDC, providing integrated circuit protection and switching functionality. The protector combines accurate, reliable circuit protection with inverse time delays and trip-free features, maintaining consistent trip current performance across a wide temperature span. The unit weighs approximately 1.8 ounces (49 grams) per pole and is designed for panel mounting with rugged three-point support. Common applications include aerospace, military, and industrial systems requiring dependable overload and short-circuit protection with minimal temperature sensitivity.