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Sentry Safety Relays

ABB Sentry safety relays begin to blur the line between safety controllers and relays. Sentry safety relays are available for standard safety circuits, two-hand control, input and output expansion, timer-based circuits, and programmable universal safety relays capable of becoming any of the previously mentioned safety relay types.

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The Sentry safety relays are powerful and easy to use safety relays, suitable for all common types of safety applications.

Features & Benefits

  • Models with displays offer preset configurations and extensive fault information.
  • Multi-reset function enables reset of up to 10 Sentry safety relays using just one reset button.
  • Single Safety Relay (USR models) for all common safety applications helps reduce stock and saves warehouse space.
  • Multi-voltage models offer more flexibility and less stock.
  • Detachable terminal blocks speeds up connection and replacement.
  • Manual or automatic reset easily selectable by switch on the front of the safety relay for many models.
  • Extended temperature range of -25°C to +65 °C (old spec. -10°C to +65°C) and relative humidity range of 10% to 95% (old spec 25% to 95%). For SSR10, SSR20 and TSR20 models.
  • Small footprint (22.5mm wide)
  • Eliminate the need for intermediate control relays and enjoy high current capacity outputs


  • Monitoring safety devices (ex. Light Curtains, Gate Switches) 
  • Expanding safe outputs (for not only Safety Relays but as well as Safety Controllers)
  • Advanced Safety Timing functions