Carpanelli® 8BRG01B half-bridge rectifier, catalog number 3416105, 13.5mm screw in, no filter. Features AC input with DC output of 44% of AC voltage. I.E. 230Vac = 101Vdc. For use with DC brakes used on motors. Rated 500Vac Max 2Amps. Black with 13.5mm thread, blue AC supply wires with black/red Dc power feed wires.