Description
Intended Use
The PSR-PS20 SIL coupling relay can be used for power adaptation and electrical isolation in high and low-demand applications up to SIL 3 according to IEC 61508 as well as EN 61511.
Using this module, circuits are interrupted in a safety-oriented manner.
The safety relay is equipped with an enabling current path and a confirmation current path that drop out without delay according to stop category 0 in accordance with EN 60204-1.
By filtering the controller test pulses, premature failure of the safety relays is prevented.
If an error occurs inside the module, the internal device input impedance is affected. As such with compatible, safe systems, the test pulses sent from the controller may be disrupted and the error can be reported back to the corresponding digital output without any additional wiring effort.

FEATUREs
– SIL 3 coupling relay for safety-related switching off
– Can be used in high and low-demand applications
– Approved for Class I, Zone 2 applications
– Easy proof test:
   - Active error acknowledgment via A1
   - Visually on the device
   - Evaluation of the force-guided N/C contact
– Integrated DCS test pulse filter
– Low inrush current
– 1 undelayed enabling current path
– 1 undelayed confirmation current path
– 1 digital signal output
– Fixed screw connection
– 6.8 mm housing width
– Controller-specific Termination Carrier available on request