... standards, such as: GB/T2820,ISO8528,IEC34,VDE0875-NRated voltage: 400/230v, 440/254v, 220/127v, etc.Phase ... excited or PMGInsulation: Class H Protection: IP21~IP23Voltage regulation: AVR automatic controlAltitude above sea level: ≤1000 metersAmbient air temperature: ≤ ... oil level indicator, emergency button,preheating button, battery voltage gauge, hours running counter for protection and tranfering.2 ...