Low-frequency plasma cutting machine using two-valve control, to improve the torch electrodes and conductive mouth, using pull plasma formed to enhance the power grid as a result of pressure drop, from arc of instability, improved electromagnetic interference place more stringent requirements. Greatly reduced High-frequency high-voltage discharge produced by electromagnetic interference, environmental protection and human design to reduce the harm to the human body. 1. A dvanced inverter technology, Low cutting frequency; 2. With arc maintainence device, applicable to automatical cutting equipment; 3. Touch and untouch arc initiation; 4. Stable arc, long working time. 5. 220v single phase, portable, fan-cooled, thermostatic protection, suitable for DIY and family use. 6. D series are for 110 / 220 duel voltage input, automatic input voltage changing 7. Complete accessories: cutting torch, welding cable, earth clamp, carton box. Item CUT-50 / 50DInput power voltageAC110/220V±10%Frequency:50/60HzRented input power capacity6.3KVARate input current28.7ANo-load voltage225VCurrent range20 -50ARated output voltage15A/86V 50A/105VRated duty cycle60%No-load power40WEfficiency:85%