The Automatic Voltage Regulator (AVR) maintains a constant voltage levelduring load changes. AVR internal sensors regulate the configuration of the Open-Delta connections and automatically adjust the amount of DC current directed to the exciter field in order to maintain stable output voltage. This AVR NTA-5A-2T is applied in engine 45SPI, 45ESI, 35SPK, 60SPI, 75SPI, 125SPK3, 150SPK.
| Auxiliary winding input | AC 55V-220V | 
| Highest excitation voltage output | 120V/12ADC/10S | 
| Frequency | 50/60HZ | 
| Generator field resistance | ≥5Ω | 
| Steady state voltage regulation | ≤5% | 
| Voltage adjust range | ≥15% | 
| Minimum residual magnetic excitation voltage | ≥5V/30HZ |