... Overall protection 4.Allow full scale long time operation DC power supply, DC-30V/2A, single output, Model MCH-302BSpecifications: ... VariableCurrent, Load Stability≤0.2%+3mARipple & Noise≤3mArmsWorkingConditionLine Power Supply220V±10% 50/60Hz(Alterable if needed :110±10 ... change without prior notice. MCH-302B supply,0-30V/2A continuously variable,single output w/fixed output industrial power supply