Siemens 3TK2845-1BB41
MPN3TK2845-1BB41
SIRIUS SAFETY RELAY WITH ELECTR. RELEASE CIRCUIT (FK) 24V DC, 45.0MM, SCREW TERMINAL, FK INSTANT.: 1S AND 1HL, FK DELAYED:1S AND 1HL 0.05..3S, MK:1HL, AUTOSTART / MONIT. START, MULTIFUNCTION UNIT, MAX. CATEGORY: 4
Source DocumentedChannel stated on listing & quote
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Independent China distributor & sourcing agent· Listing updated Sep 2026
Specifications
| Parameter | Value |
|---|---|
| Mounting | screw and snap-on mounting |
| Type of electrical connection | screw-type terminals |
| Safety device type acc. to IEC 61508-2 | Type B |
| Type of electrical connection plug-in socket | Yes |
| Type of voltage of the control supply voltage | DC |
| Type of the safety-related wiring of the inputs | single-channel and two-channel |
| Insulation voltage rated value | 300 V |
| Surge voltage resistance rated value | 4 000 V |
| Design of the fuse link for short-circuit protection of the NO contacts of the relay outputs required | gL/gG: 4 A or fast-acting: 4A |
| Recovery time after power failure typical | 8 000 ms |
| Operating frequency maximum | 2 000 1/h |
| Protection class IP of the enclosure | IP20 |
| Parameter | Value |
|---|---|
| At 24 V | 1 A |
| At 115 V | 3 A |
| At 230 V | 3 A |
All specifications
| Parameter | Value |
|---|---|
| Mounting position | any |
| Installation environment regarding EMC | This 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. |
| Installation altitude at height above sea level maximum | 2 000 m |
| DC resistance of the cable maximum | 1 000 Ω |
| Protection class IP of the terminal | IP20 |
| Shock resistance | 8g / 10 ms and 15g / 5 ms |
| EMC emitted interference | IEC 60947-5-1, IEC 60000-4-3, IEC 60000-4-5, IEC 60000-4-6 |
| Relative humidity during operation | 10 ... 95 % |
| Protection against electrical shock | finger-safe |
| Vibration resistance acc. to IEC 60068-2-6 | 5 ... 500 Hz: 0,075 mm |
| Depth | 88 mm |
| Width | 45 mm |
| Height | 138.5 mm |
| UL approval | Yes |
| Acc. to IEC 61508 | 3 |
| Hardware fault tolerance acc. to IEC 61508 | 1 |
| For delayed release circuit acc. to IEC 61508 | SIL3 |
| Solid | 2x (20 ... 14) |
| At DC | 0.85 ... 1.15 |
| Typical | 25 ms |
| Stranded | 2x (20 ... 14) |
| Start input | Yes |
| Safety switch | Yes |
| At DC maximum | 100 ms |
| During storage | -40 ... +80 °C |
| Feedback input | Yes |
| Automatic start | Yes |
| During operation | -25 ... +60 °C |
| Valve monitoring | No |
| Delayed switching | 0 |
| At DC rated value | 24 V |
| Monitored Start-Up | Yes |
| Design of the product | for EMERGENCY-STOP and safety doors |
| Instantaneous contact | 1 |
| Standstill monitoring | No |
| 1-Channel or 2-Channel | 2 |
| EMERGENCY OFF function | Yes |
| Light array monitoring | Yes |
| Acc. to EN ISO 13849-1 | e |
| Design of the cascading | cascading or in-service switching |
| Safety-Related circuits | Yes |
| Laser scanner monitoring | Yes |
| Light barrier monitoring | Yes |
| With core end processing | 1x (0.5 ... 2.5 mm²), 2x (0.5 ... 1.5 mm²) |
| Rotation speed monitoring | No |
| Tactile sensor monitoring | Yes |
| Position switch monitoring | Yes |
| Protective door monitoring | Yes |
| Of the sensor input minimum | 45 ms |
| Air pressure acc. to SN 31205 | 90 ... 106 kPa |
| Monitoring of floating sensors | Yes |
| Of the cascading input minimum | 0.045 s |
| Category acc. to EN ISO 13849-1 | 4 |
| EMERGENCY-OFF circuit monitoring | Yes |
| Safety-Related delayed switching | 1 |
| Pressure-sensitive mat monitoring | Yes |
| Monitoring of non-floating sensors | Yes |
| Of the ON pushbutton input minimum | 0.2 s |
| Product feature cross-circuit-proof | Yes |
| Cascading input (Functional switching) | Yes |
| Safety-Related instantaneous contact | 1 |
| Stop category acc. to DIN EN 60204-1 | 0 + 1 |
| Reference code acc. to DIN EN 61346-2 | F |
| For enabling circuit at dc-13 at 24 | 1 A |
| Magnetically operated switch monitoring | Yes |
| For signaling function at dc-13 at 24 | 0.5 A |
| Suitability for interaction press control | No |
| PFHD with high demand rate acc. to EN 62061 | 0.0000000069 1/h |
| For signaling function instantaneous contact | 0 |
| SIL claim limit (subsystem) acc. to EN 62061 | 3 |
| Magnetically operated switch monitoring NC-NC | Yes |
| Magnetically operated switch monitoring NC-NO | No |
| Mechanical service life (switching cycles) typical | 100 000 |
| For delayed release circuit acc. to EN ISO 13849-1 | e |
| Recovery time after opening of the safety circuits typical | 400 ms |
MPN
3TK2845-1BB41