Features : Single and two phase wide input range 180 ~ 550VAC Protections: short circuit/overload/over voltage/over temperature Cooling by free air convection Built-in constant current limiting circuit Can be installed on DIN rail TS-35/7.5 or 15 UL508(industrial control equipment)approved EN61000-6-2(EN50082-2) industrial immunity level 100% full load burn-in test Built-in DC OK relay contact