SST-DH8000/B combined electrical fire monitoring detector can collect the voltage and current values of the power supply of the monitored fire-fighting equipment, judge and display the working status of the power supply and fault information such as overvoltage, undervoltage, overcurrent, phase loss, and phase error; detect the residual current, temperature and other parameters in the protected line. Once the detector detects that the electrical equipment has leakage or the line temperature is too high, it will issue an audible and visual alarm, effectively ensuring the safety of people's electricity use and preventing the occurrence of electrical fires.