Zinc oxide arrester, otherwise known as a metal oxide surge arrester, is an electrical device used to protect electrical equipment from overvoltages and transients. The zinc oxide lighting arrester is preferred over other technologies since it provides better energy handling capacity, longer lifespan, and faster response time. It is constructed from a ceramic-metal composite that comprises zinc oxide particles; this construction creates the nonlinear varistor element of the device.

The zinc oxide arrester operates by providing a low impedance path for overvoltage surges to the ground, which is caused when excess energy is dissipated by the arrester's metal oxide elements. During normal operation, it remains in a high resistance state and does not affect the electrical system. The zinc oxide arrester is used in high voltage and extra high voltage power systems, as well as in many other applications where overvoltage protection is required.

Zno surge arrester have a high surge current capacity and can handle higher energy without damage. They also have a fast response time and can withstand numerous surges without degradation of their performance. Zinc oxide arrester are widely used in modern power systems and are available in various sizes and voltage ratings to suit different applications.