Three phase speed controller by auto-transformer. IP54 ABS casing for RMT-1,5 and RMT-2,5 models. IP54 metallic casing from RMT-5 to RMT-12 models. Electrical supply: 3/400V/50-60Hz. Five position knob (0/1/2/3/4). Voltage: 90, 150, 200, 280 and 400 V. Pilot light