Over voltage and under voltage protection system is a device used to protect electrical and electronic equipment from damage caused by voltage fluctuations. The system operates by monitoring the incoming voltage and automatically disconnecting the equipment if the voltage exceeds or falls below the pre-set limits. Over voltage can cause equipment damage, while under voltage can cause the equipment to malfunction or fail to operate at all. The protection system helps to prevent these issues, ensuring the longevity and reliability of the equipment. It is commonly used in industries such as manufacturing, telecommunications, and data centers.