General
Type of electric connection	Screw connection
Type of switch function of the inputs	Normally open contact (NO)
Number of outputs, safety related, undelayed, with contact	3
Number of outputs, safety related, delayed, with contact	0
Number of outputs, safety related, undelayed, semiconductors	0
Number of outputs, safety related, delayed, semiconductors	0
Number of outputs, signalling function, undelayed, with contact	0
Number of outputs, signalling function, delayed, with contact	0
Number of outputs, signalling function, undelayed, semiconductors	0
Number of outputs, signalling function, delayed, semiconductors	0
Type class for safety demands in accordance with EN 574	Type III C
SIL according to IEC 61508	3
Performance level acc. EN ISO 13849-1	Level e
Width	22.5
Height	120
Depth	120
Operating voltage at AC 50 Hz	24
Operating voltage at AC 60 Hz	24
Operating voltage at DC	24
Rated switch current	6
Supply voltage AC 50 Hz	24
Supply voltage AC 60 Hz	24
Supply voltage DC	24
Voltage type (operating voltage)	DC
Voltage type of supply voltage	DC
Rail mounting possible
With detachable clamps
With feedback circuit
With start input
Suitable for safety functions
With approval for BG BIA
With approval according to UL

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.