ES phase balance relays provide monitoring and protection in three-phase
applications. Two models are available: the ES-47N provides phase unbalance,
phase loss, phase reversal/phase sequence protection and the ES-47N/27
provides the same protection as the ES-47N in addition to undervoltage
protection. See note below for additional information. Microprocessor-based
circuitry enhances functionality and improves performance.

Internal diagnostics annunciate when relay function or accuracy is compromised.
The ES-47 Phase Sequence Relay monitors a three-phase, three-wire system
for correct phase rotation/sequence. It provides protection against incorrect
phase sequence, phase loss, and undervoltage. ES-47 relays operate on only
the fundamental component of the sensed voltage, rejecting all harmonic
components.The ES-47 Phase Sequence Relay monitors a three-phase,
three-wire system for correct phase rotation/sequence.
It provides protection against incorrect phase sequence, phase loss, and
undervoltage. ES-47 relays operate on only the fundamental component of
the sensed voltage, rejecting all harmonic components.
ES ac current relays provide current monitoring and protection and may be
specified for use in single-phase or three-phase applications.
Three models are available: the ES-37 provides undercurrent protection,
the ES-51 provides overcurrent protection, and the ES-37/51 provides
undercurrent and overcurrent protection. Microprocessor-based circuitry
enhances functionality and improves performance. Internal diagnostics
annunciate when relay function or accuracy is compromised.
ES-49 temperature relays use resistance detectors (RTDs) to monitor remote
temperatures. An ES-49 relay can be specified with three or six inputs and
specified to monitor copper or platinum RTDs. Microprocessor-based circuitry
enhances functionality and improves performance.
Internal diagnostics annunciate when relay function or accuracy is compromised.
ES frequency relays provide frequency monitoring and protection for use in
single-phase or three-phase applications.
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