These inductors are used in a renewable energy application. Rated 620Adc, 1.5mH designed for 1kHz ripple current, they consist of 40mil copper foil windings, 10" wide with integral ventilation slots assembled on 26M19 electrical grade steel cores. High temperature, Class H (180C) insulation system. Heavy duty 1105HTC vacuum-varnish encapsulant for harsh environment. Total weight approx 520lbs.