Technical specification, model and type: UNITROL1020 is an automatic voltage regulator (AVR) of ABBUNITROL1000 series, which is mainly used for excitation control of small and medium-sized synchronous generators. Control mode: microprocessor control, advanced PID control algorithm. Output current: Max. 10 A (continuous operation).Communication interface: support Modbus, Ethernet, RS485, CAN and other communication protocols. Protection function: over-voltage, under-voltage and over-current protection. Working temperature: -20 ℃ to + 70 ℃, suitable for wide temperature industrial environment.