... a high voltage, over current and short-circuit and overheat warning device2.16 bit microprocessors, the intelligent control and easy operation 3.Low distortion ... 4 number displayProtection functionover voltage, over current, over temperature, over load, short circuit, and automatic alarmInsulation reactance500Vdc 20MΩPressure endurance1800Vac/5mA/1minuteCooling ...