R438Specification: âVoltage Regulation +/- 0.5% âShort circuit capability: 3 x Irated for 10 seconds âVoltage sensing: â95~140 volts (50/60 Hz) or â170~260 volts (50/60 Hz) or â340~520 volts (50/60 Hz) âRemote voltage adjustment range of :+/-5% âFit for:1000 series generator,2000 series generator and 3000 series generator.