MX321 is a three phase sensed Automatic Voltage Regulator and forms part of the excitation system for a brushless generator.Excitation is derived from a three phased permanent magnet generator(PMG),to isolate the AVR control circuits from the effects of nonlinear loads and to reguce radio frequency interence on the generator terminals.Sustained generator short circuit current is another feature of the PMG system. The AVR sense the voltage in the main generator winding and controls the excitation to maintain the generator output voltage with the specified limits,compensating for load,speed,temperature and factor of the generator. Thress phase sensing is emplyed for superior voltage regulation.Adjustable soft circuitry is included to a smooth controlled build up of generator output voltage. Sensing input: Voltage 190-264V ac max, 2 or 3 phase Frequency 50-60 Hz nominal input: Voltage 170-220V ac max, 3 phase, 3 wire Current 3A/phase Frequency 100-120 Hz nominal Output Voltagemax 120V dc Current continuous 3.7 A Intermittent 6A for 10 secs. Resistance 15 ohms minimum Regulation +/- 0.5% with 4% engine goveming Material: plastic colour: black Package Contents: 1 x Automatic Voltage Regulator Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.