The voltage safety protector an automatic protection for home appliances in case of under-voltage, ultra-voltage and electricity stoppage. For instance, it may be always harmful to the normal operation, cut their service life, or even burn down the compressor motors for air-conditioners, refrigerators and freezing cabinets if the supply voltage is too low or too high. Especially, instant power stoppage and restarting supply with the electricity net creates a strong voltage impact which is very hazardous and may damage compressor.