The Sentry series from ABB covers the entire spectrum of safety relays, from basic models for simple safety applications or for multiplying safety outputs, to highly flexible universal models with extremely precise timer functions. The series therefore covers all requirements for safety applications. Manual or automatic reset can be easily selected using a switch on the front of the relay. The new multi-reset function enables up to 10 Sentry safety relays to be reset with just one reset button. The basic BSR models are suitable for emergency stop shutdowns or for expanding safety outputs, for example. The single-function SSR models are suitable for applications such as monitoring contacts and OSSD signals or for two-hand switching. The TSR safety timers are characterized by their very high accuracy of better than 1%, and the USR universal models for all common safety applications also offer display and configuration options.
| Property | Value |
| Number of outputs, signaling function, undelayed, contact-based: | 1 |
| Number of outputs, safety-related, undelayed, contact-based: | 3 |
| Design of the switching function of the inputs: | changeover contact |
| Design of the electrical connection: | other |
| Suitable for safety functions: | yes |
| Category according to EN 954-1: | 4 |
| With start input: | yes |
| With TÜV approval: | yes |
| With approval for BG BIA: | no |
| With approval according to UL: | yes |
| Performance level according to EN ISO 13849-1: | Level e |
| Voltage type for actuation: | AC |
| Mounting rail mounting possible: | yes |
| Width: | 22.5 mm |
| Height: | 120 mm |
| Depth: | 120 mm |
| With removable terminals: | yes |
| With feedback loop: | yes |
| Type class for safety requirements according to EN 574: | Type III C |
| Rated control supply voltage Us at AC 50 Hz: | 85 to 265 V |
| Rated control supply voltage Us at AC 60 Hz: | 85 to 265 V |
| Rated control supply voltage Us at DC: | 120 to 375 V |
| SIL according to IEC 61508: | 3 |
