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Universal safety relays

Sentry USR models are universal safety relays and the same model can be used with most types of safety devices which reduces stock and saves warehouse space. Maintenance personnel also have fewer models to learn.

All Sentry USR models have a display on the front for simple configuration. The display also offers extensive indication about the status and error messages for the relay.

Sentry USR10 and USR22 are each suitable for monitoring emergency stop buttons, safety switches, OSSD-devices, two-hand devices and contact mats/bumpers/edges. 

Main features

  • One model for all applications
  • Up to PL e/SIL3
  • Simple configuration using display to select between preset configurations and custom configuration
  • Advanced timer functions 0 to 999 seconds
    • Precision of 0.1 second up to 100 seconds and 1 second over 100 seconds
    • Accuracy of ± 1%
  • Display with extensive status information
  • Multi-reset allows one reset button to reset up to 10 safety relays
  • Lighting and flashing of the reset button managed by the Sentry safety relay
  • Extensive LED indication
  • Removable terminal blocks
  • Available with spring-loaded push-in terminals or screw terminals


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CAD drawings for all Safety Products are available here.