Voltage protectors are used when voltage current surges beyond rated value. These units quickly cut power to avoid damage or even fire within your refrigerators, air conditioners, heaters, coolers, freezers, etc. Voltage protectors feature: bright LED lighting, easy installation, single output, and cut-offs of under voltage. Over/Under Voltage Protection: When the voltage exceeds the limit, it will automatically cut off the power to prevent the electrical appliances being damaged by the too low or too high voltage. Lightning Protection: Instantaneous voltage exceeds the limit, the product will protect the electrical appliance against excessive voltage damage automatically and quickly. Phosphor Bronze: with good electrical conductivity, corrosion resistance and wear resistance.