Siemens 3TK2826-1CW31
MPN3TK2826-1CW31
!!! Phased-out product!!! The successor product series is 3SK2 (see FAQ 109741483) SIRIUS safety relay with relay enabling circuits (EC) 24...240 V UC, 45 mm overall width screw terminal EC instantaneous: 2 NO EC delayed: 2 SC: 3 Switch with 8 functions Basic device Maximum achievable PL according to EN 13849-1: Maximum achievable SIL according to IEC 61508: 3
StockContact for availability
MOQ1 pcs
Sourced new & surplus through independent channelsListing updated Jun 2026
Specifications
Identification
| Parameter | Value |
|---|---|
| Product brand name | SIRIUS |
| Product designation | safety relays |
| Product design / configuration | for EMERGENCY-STOP and safety doors |
Safety ratings
| Parameter | Value |
|---|---|
| Safety integrity level (IEC 61508) | 3 |
| Category (EN ISO 13849-1) | 4 |
| PFHd, high demand rate (EN 62061) | 7.8E-9 1/h |
| Hardware fault tolerance (IEC 61508) | 1 |
| Stop category (EN 60204-1) | 0 + 1 |
| Safety device type (IEC 61508-2) | Type B |
Monitoring & inputs
| Parameter | Value |
|---|---|
| Emergency-off circuit monitoring | Yes |
| Protective door monitoring | Yes |
| Position switch monitoring | Yes |
| Safety switch | Yes |
| Magnetically operated switch monitoring | Yes |
| Start input | Yes |
| Tactile sensor monitoring | Yes |
| Valve monitoring | No |
| Monitored start-up | Yes |
| Feedback input | Yes |
Outputs & contacts
| Parameter | Value |
|---|---|
| Safety-related instantaneous contacts | 2 |
| Safety-related delayed contacts | 2 |
| Signaling-function instantaneous contacts | 2 |
| Max. operating frequency | 2 000 1/h |
Electrical
| Parameter | Value |
|---|---|
| Rated insulation voltage | 300 V |
| Rated surge voltage withstand | 4 000 V |
| Control supply voltage type (AC/DC) | AC/DC |
| Required output short-circuit protection (fuse / MCB) | gL/gG: 4 A, or quick: 6 A |
Connection
| Parameter | Value |
|---|---|
| Type of electrical connection | screw-type terminals |
| Conductor cross-section, solid | 2x (20 ... 14) |
| Conductor cross-section, stranded | 2x (20 ... 14) |
| Conductor cross-section, with ferrule | 1x (0.5 ... 2.5 mm²), 2x (0.5 ... 1.5 mm²) |
| Plug-in socket connection | Yes |
Mechanical
| Parameter | Value |
|---|---|
| Touch protection against electric shock | finger-safe |
| Fastening method | screw and snap-on mounting |
| Mounting position | any |
| Width | 45 mm |
| Height | 138.5 mm |
| Depth | 120 mm |
Environmental
| Parameter | Value |
|---|---|
| Operating temperature range | -25 ... +60 °C |
| Storage temperature range | -40 ... +80 °C |
| Relative humidity, operating | 10 ... 95 % |
| Enclosure protection rating (IP) | IP20 |
| Installation altitude, max. | 2 000 m |
| Shock resistance | 8g / 10 ms |
| Vibration resistance (IEC 60068-2-6) | 5 ... 500 Hz: 0,075 mm |
| Air pressure (SN 31205) | 90 ... 106 kPa |
| EMC / emitted interference standards | EN 60947-5-1 |
Approvals
| Parameter | Value |
|---|---|
| UL approval | Yes |
Specifications
| Parameter | Value |
|---|---|
| Electrical Endurance (Operating Cycles) Typical | 100 000 |
MPN
3TK2826-1CW31