General
Model	Expansion device
Type of electric connection	Screw connection
Evaluation inputs	One- and two-channel
Release-delay	20
Number of outputs, safety related, undelayed, with contact	4
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 of safety acc. IEC 61496-1	None
Stop category acc. IEC 60204	0
Performance level acc. EN ISO 13849-1	Level e
SIL according to IEC 61508	3
Width	22.5
Height	120
Depth	120
Control voltage 1	24
Control voltage 2	24
Operating voltage at DC	24
Power consumption	2
Rated switch current	5
Supply voltage DC	24
Type of control voltage 1	DC
Type of control voltage 2	DC
Voltage type (operating voltage)	DC
Voltage type of supply voltage	DC
Suitable for monitoring of position switches
Suitable for monitoring of emergency-stop circuits
Suitable for monitoring of valves
Suitable for monitoring of optoelectronic protection equipment
Suitable for monitoring of tactile sensors
Suitable for monitoring of magnetic switches
Suitable for monitoring of proximity switches
Rail mounting possible
With detachable clamps
With start input
With muting function
With feedback circuit
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.