Hammond Manufacturing's 157D is a D.C. reactor within the 153-159 series, engineered for low to medium current applications. These reactors offer economical open-channel mounting and a 15% tolerance on both inductance and resistance. They are vacuum impregnated with polyurethane varnish, ensuring quiet and long-lasting operation. The 157D is particularly well-suited for high-voltage power supply filtering and is a reliable choice for various industrial applications. Each unit undergoes 100% Hipot testing at 1,500 VAC to ensure quality and safety.