ES Series, Protection Relays

ES Series Protection Relays provide a wide range of cost-saving options to simplify protection related to Generator, Transformer, Distribution, Process Control, Auto Transfer Schemes, and Motor applications. ES relays offer many high-end features not typically found in a low-cost device to provide simple, yet sophisticated, protection for your applications. Multiple DIN-rail mounting options are available.


  • Simplify protection by covering a wide range of applications using ES relays.
  • Sophisticated fundamental sensing technology gives you high-end harmonic protection capabilities that prevent false tripping and allows you to be more selective.
  • DIN-rail mounting provides low-cost, fast, easy, and compact installation.
  • Relay settings are simple and intuitive, making setup fast with no PC required.
  • Red and green LEDs on the front panel provide intuitive, easy-to-understand indication of system status.
  • Digital microprocessor design is extremely accurate to ensure a high level of dependability and security, giving you confidence in your settings.
  • The ES relay self-monitors to detect internal component failure and, in the unlikely event of an internal failure, flashes the Power LED.
  • Models are available in six standard input voltages.
  • Many ES relay models are self-powered, eliminating the need for additional power sources.
  • Conformal coating improves protection against dust and corrosion.
  • Accurate, repeatable, and reliable operation.



Technical Resources


Case Studies