The AM1-D3-A-20-2 is a single-pole, series trip hydraulic-magnetic circuit breaker from the Heinemann® AM/R series, designed for DC circuit protection. It features a current rating of 20A, a medium time delay curve, and an 8X inrush tolerance, making it suitable for applications with moderate startup surges. The breaker is configured with M3-0.5 gold plug-in terminals (Ø 7.77 x 16.6 mm) and a black handle with ON/OFF markings. Its hydraulic-magnetic mechanism is insensitive to ambient temperature changes, which prevents nuisance tripping and eliminates the need for temperature derating. This makes the AM1-D3-A-20-2 a reliable choice for critical control, protection, and panelboard installations.