What Is Undervoltage? How Can I Protect My Equipment?

Three-Phase Monitor Relays


What Is Undervoltage? How Can I Protect My Equipment?


Undervoltage occurs when the average voltage of a three-phase power system drops below intended levels, and is sometimes referred to as a brown-out. Electromechanical devices, including three phase motors and pumps, are designed to be operated at very specific voltage levels. If these devices are allowed to operate at reduced voltage levels they will draw higher currents. The increase in current causes increased heat in the winding and coils of the equipment damaging the critical insulation protecting them. Operating in Undervoltage conditions can drastically reduce the life of the electromechanical equipment and lead to premature failure.

Undervoltage conditions are usually caused by undersized or overloaded utility and facility transformers. During peak demand periods and/or when the utility is experiencing problems, the demand for power exceeds the capability of the transformer and as a result the voltage drops. These conditions can occur without warning and provide no obvious indications. To protect motors and equipment, use a three-phase monitor relay, also known as a phase failure relay, as a cost-effective solution to prevent costly damage from undervoltage.

three-phase monitor relay provides undervoltage protection to shut down equipment and prevent damage when an undervoltage occurs. A clear indication of the fault present is provided by these relays for rapid troubleshooting and reduced downtime.

Three-phase motors and other equipment are commonly used in a variety of industries:

Macromatic offers three-phase monitor relays(phase failure relays) specifically engineered for detecting undervoltage issues. Learn more about protecting equipment and preventing expensive repairs with Macromatic’s Three-Phase Monitor RelaysContact us if you have more questions about undervoltage relay protection.