Siemens SIRIUS 3SK1

WARNING
3SK1..1 and 3SK1..3 safety relays (devices with contacting outputs):
In continuous operation, the key safety values apply where the function test interval (state
change of the outputs) for SIL2 ≤ 1 year and for SIL3 ≤ 1 month.
Exception: A function test interval ≤ 1 year is also permissible for SIL3 applications in the
process industry (in accordance with IEC 61511), exclusively for low-demand use, due to a
signi󹪝cantly lower failure rate/probability of the electromechanical components. This does not
apply to safety-related applications in accordance with the Machinery Directive 2006/42/EC.
3SK1..2 and 3SK1120 safety relays (devices with semiconductor outputs up to product version
E01/V1.0.0):
In continuous operation, the key safety values apply where the function test interval (state
change of the outputs) ≤ 1 year.
3SK1..2 and 3SK1120 safety relays (devices with semiconductor outputs from product version
E02/V1.1.0):
In continuous operation, the key safety values apply where the function test interval (state
change of the outputs) ≤ 20 years.
Function test procedure:
• Actuate the connected sensors.
• Check their e󹪜ect on the safety relay and the downstream actuators.
• Activate the safety relay via the connected sensors.
• Check their e󹪜ect on the safety relay and the downstream actuators.
• Replace the defective devices.
Note
3SK1..2 and 3SK1120 safety relays (devices with semiconductor outputs) as from E02/V1.1.0
run power-on tests, so-called light tests, at regular intervals in the "OFF state".
Note
3ZY12 device connectors
Only safety relays with a supply voltage of 24 V DC may be used on the 3ZY12 device connector.
Note
Cover the 3ZY12 device connector on the left-hand side using the cover supplied with the device
termination connector.
Safety instructions
2.1 General safety notes
SIRIUS 3SK1 Safety Relays and 3RQ1 Positively-Driven Coupling Relays
Equipment Manual, 05/2021, A5E02526190021A/RS-AE/005 25