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Description: Working voltage: AC 220V Regulation voltage: AC 10-220V Max power: 4000W (resistive load) Efficiency: 90% Dimensions: 85 x 55 x 38MM Note: You should connect to the load earlier than the regulator. SCR is mainly used for resistive plenty (incandescent electrical wire, etc.), most of the single-phase AC motor can, but can't guarantee, other kinds of plenty visitor to substantiate their own. Fuse isn't always a panacea, there is reaction time, if the current is simply too large, in addition to burn the fuse, the module will also be burned. Attention to fitting plastic cover due to establish of the housing, can't be completely open, screwdriver to tighten the aspect with the point, the other to be careful when opened, immoderate stress smoothly snapping the lid, explicit transportation may perhaps beaten for carrying parts, but It doesn't impression the module. Package included: 1 x 4000W AC220V SCR silicon controlled digital volt regulator