Conduction/Convection 'Self-regulating' PTC cabinet heater, offers a wide range of power outputs from a single, compact footprint sizeCan be operated without the aid of a thermostat/overloadHeater operating voltage range 100-240Vac/dcType 3a DIN (EN50022) rail mounting with clip supplied (344-3646,344-3652, and344-3674)Type 3b base/surface mounting (344-3680,344-3696,344-3703 and344-3719)Approvals VDE, UL, CSA