Features: Single phase, single output dc power supply; Constant voltage and constant current operation (C.C and C.V. automatic conversion); Both current and voltage can be adjusted from 0 to rated value; 3LED digital display; Built-in EMI filter.(have anti-interference circuit); Intelligent temperature control fan to help power supply cooling fast; Applications: Charge batteries, PCB board manufacturing industry/motors, LED products, and dc fans test/electrofacing, electrolyzation, electronic components ageing/laboratory, Electronic equipment, automatic Test Equipment/All other occasions need to use DC Power Supply. Protection function: Over voltage protection; Over load protection; Over temperature protection; Current limitation protection; Specifications: Model No: LW-3030KD Input voltage: single-phase 220V float 10% 50Hz or 110V float 10% 60Hz Working conditions: -10 - 40 degree celsius relative humidity :< 90% Storage conditions: -20 - 80 degree celsius relative humidity :< 80% Output voltage: 0-30V adjustable Output current: 0-40A adjustable Display Accuracy: float 1% float 1 digit Voltage stabilization: <=0.5% Current stabilization: <=0.8% Load stabilization: <=0.5% Ripples and noises: <=1 %( RMS) Surge Current: 30A/115V, 60A/230V (cold-start) Input Leakage Current: <0.7mA/230V Withstanding voltage test: From input to output voltage: 1.5KVAC/min From input voltage to case: 1.5KVAC/min From output voltage to case: 500VAC/min Appearance size: length 470mm* width 320mm* height 220mm (excluding protruding parts)