3TK2821-1CB30
SIRIUS SAFETY RELAY

From SIEMENS

SIRIUS safety relay with relay enabling circuits (EC) 24 V AC/DC, 22.5 mm Screw terminal EC instantaneous: 3 NO EC delayed: 0 NO SC: 1NC Autostart/manual start Basic device Maximum achieved SIL: 1, PL: c as expansion unit up to maximum achieved SIL: 3, PL: e
General technical data
Product brand nameSIRIUS
Product designationsafety relays
Design of the productfor EMERGENCY-STOP units
Protection class IP of the enclosureIP40
Protection class IP of the terminalIP20
Protection against electrical shockfinger-safe
Insulation voltage rated value300 V
Ambient temperature
during storage-40 ... +80 °C
during operation-25 ... +60 °C
Air pressure acc. to SN 3120590 ... 106 kPa
Relative humidity during operation10 ... 95 %
Installation altitude at height above sea level maximum2 000 m
Vibration resistance acc. to IEC 60068-2-65 ... 500 Hz: 0,075 mm
Shock resistance8g / 10 ms
Surge voltage resistance rated value4 000 V
EMC emitted interferenceEN 60947-5-1
Installation environment regarding EMCThis product is suitable for Class A environments only. It can cause undesired radio-frequency interference in residential environments. If this is the case, the user must take appropriate measures.
Reference code acc. to DIN 40719 extended according to IEC 204-2 acc. to IEC 750KT
Reference code acc. to DIN EN 61346-2F
Number of sensor inputs
1-channel or 2-channel1
Design of the cascadingnone
Type of the safety-related wiring of the inputssingle-channel or single-channel and two-channel
Product feature cross-circuit-proofNo
Safety Integrity Level (SIL)
acc. to IEC 615083
SIL Claim Limit (subsystem) acc. to EN 620611
Performance level (PL)
acc. to EN ISO 13849-1e
Category acc. to EN 954-13
Category acc. to EN ISO 13849-13
Hardware fault tolerance acc. to IEC 615081
Safety device type acc. to IEC 61508-2Type A
PFHD with high demand rate acc. to EN 620610.0000000011 1/h
Average probability of failure on demand (PFDavg) with low demand rate acc. to IEC 615080.00000099 1/y
T1 value for proof test interval or service life acc. to IEC 6150820 y
Number of outputs as contact-affected switching element
as NC contact
— for signaling function instantaneous contact1
as NO contact
— safety-related instantaneous contact3
— safety-related delayed switching0
Number of outputs as contact-less semiconductor switching element
safety-related
— delayed switching0
— instantaneous contact0
for signaling function
— delayed switching0
— instantaneous contact0
Stop category acc. to DIN EN 60204-10
General technical data
Design of input
cascading input/functional switchingNo
feedback inputYes
Start inputYes
Type of electrical connection Plug-in socketYes
Operating frequency maximum1 000 1/h
Switching capacity current
of the NO contacts of the relay outputs at DC-13
— at 24 V5 A
— at 115 V0.2 A
— at 230 V0.1 A
of the NO contacts of the relay outputs at AC-15
— at 115 V5 A
— at 230 V5 A
of the NC contacts of the relay outputs at DC-13
— at 24 V5 A
— at 115 V0.2 A
— at 230 V0.1 A
of the NC contacts of the relay outputs at AC-15
— at 115 V5 A
— at 230 V5 A
Thermal current of the switching element with contacts maximum5 A
Electrical endurance (switching cycles) typical100 000
Mechanical service life (switching cycles) typical10 000 000
Design of the fuse link for short-circuit protection of the NO contacts of the relay outputs requiredgL/gG: 6 A, or quick: 10 A
DC resistance of the cable maximum30 Ω
Wire length between sensor and electronic evaluation device with Cu 1.5 mm² and 150 nF/km maximum1 000 m
Make time with automatic start
at DC maximum200 ms
at AC maximum200 ms
Make time with automatic start after power failure
maximum300 ms
Backslide delay time after opening of the safety circuits typical125 ms
Backslide delay time in the event of power failure
typical125 ms
maximum200 ms
Recovery time after opening of the safety circuits typical200 ms
Recovery time after power failure typical200 ms
Pulse duration
of the sensor input minimum200 ms
of the ON pushbutton input minimum0.15 s
Control circuit/ Control
Type of voltage of the control supply voltageAC/DC
Control supply voltage frequency
1 rated value50 Hz
2 rated value60 Hz
Control supply voltage 1
at DC rated value24 V
Control supply voltage 1 at AC
at 50 Hz rated value24 V
at 60 Hz rated value24 V
Operating range factor control supply voltage rated value of magnet coil
at AC
— at 50 Hz0.85 ... 1.1
— at 60 Hz0.85 ... 1.1
at DC0.85 ... 1.2
Installation/ mounting/ dimensions
Mounting positionany
Mounting typescrew and snap-on mounting
Width22.5 mm
Height120 mm
Depth120 mm
Connections/Terminals
Type of electrical connectionscrew-type terminals
Type of connectable conductor cross-sections
solid1x (0.5 ... 4.0 mm²), 2x (0.5 ... 2.5 mm²)
finely stranded
— with core end processing1x (0.5 ... 2.5 mm²), 2x (0.5 ... 1.5 mm²)
Type of connectable conductor cross-sections at AWG conductors
solid2x (20 ... 14)
stranded2x (20 ... 14)
Product Function
Product function
Light barrier monitoringNo
Standstill monitoringNo
protective door monitoringYes
Automatic startYes
magnetically operated switch monitoring NC-NONo
rotation speed monitoringNo
laser scanner monitoringNo
monitored start-upNo
Light array monitoringNo
magnetically operated switch monitoring NC-NCNo
EMERGENCY OFF functionYes
Pressure-sensitive mat monitoringNo
Suitability for interaction press controlNo
Suitability for use
Monitoring of floating sensorsYes
Monitoring of non-floating sensorsNo
safety switchYes
position switch monitoringYes
EMERGENCY-OFF circuit monitoringYes
valve monitoringNo
tactile sensor monitoringNo
magnetically operated switch monitoringNo
safety-related circuitsYes

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