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The ES-25 Sync-Check Relay is a microprocessor-based protection relay designed to verify synchronization between two AC power sources before allowing circuit breaker closure. Commonly used in automatic and manual breaker closing schemes, the ES-25 monitors phase displacement and voltage differences between two circuits and provides a contact output when synchronization conditions are met. Suitable for single-phase, dual-phase, and three-phase systems, the relay helps prevent equipment damage and system disturbances caused by out-of-synchronism breaker operation. With advanced digital design, dependable performance, and integrated diagnostics, the ES-25 is an ideal solution for generator interconnection, utility synchronization, and power system protection applications.
