Tailored solutions for diverse sectors and challenges.
The ES-81U Underfrequency Relay is a microprocessor-based protection relay designed to provide reliable frequency monitoring and underfrequency protection for electrical power systems. Suitable for both single-phase and three-phase applications, the ES-81U continuously monitors system frequency and initiates protective action when frequency falls below configured operating limits. Adjustable settings and timing functions help prevent nuisance trips caused by temporary system disturbances while ensuring dependable protection during sustained abnormal conditions. Advanced internal diagnostics continuously verify relay performance and indicate when functionality or measurement accuracy may be compromised. The ES-81U is an ideal solution for generator, utility, industrial, and commercial applications requiring dependable frequency protection and system reliability.
