Siemens 3TK2820-1AJ20
MPN3TK2820-1AJ20
SIRIUS safety relay with relay enabling circuits (EC) 115V AC, 22.5 mm Screw terminal Basic device Auto-start, monitored start EC instantaneous: 3 NO EC delayed: 0 NO SC: 1NC max. error category EN 13849-1: 4 Maximum achievable PL according to EN 13849-1: e Maximum achievable SIL according to IEC 61508: 3
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026
Specifications
| Parameter | Value |
|---|---|
| Product brand name | SIRIUS |
| Product designation | safety relays |
| Product design / configuration | for EMERGENCY-STOP and safety doors |
| Parameter | Value |
|---|---|
| Safety integrity level (IEC 61508) | 3 |
| Category (EN ISO 13849-1) | 4 |
| PFHd, high demand rate (EN 62061) | 9.4E-10 1/h |
| Hardware fault tolerance (IEC 61508) | 1 |
| Stop category (EN 60204-1) | 0 |
| Safety device type (IEC 61508-2) | Type A |
| 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 | No |
| Valve monitoring | No |
| Monitored start-up | Yes |
| Feedback input | Yes |
| Parameter | Value |
|---|---|
| Safety-related instantaneous contacts | 3 |
| Safety-related delayed contacts | 0 |
| Signaling-function instantaneous contacts | 1 |
| Max. operating frequency | 2 000 1/h |
| Parameter | Value |
|---|---|
| Rated insulation voltage | 300 V |
| Rated surge voltage withstand | 4 000 V |
| Control supply voltage type (AC/DC) | AC |
| Required output short-circuit protection (fuse / MCB) | gL/gG: 10 A or quick-response: 10 A or MCB type B: 2 A or MCB type C: 1.6 A or SITOP select diagnostics module (order No.: 6EP1961-2BA00) |
| Parameter | Value |
|---|---|
| Type of electrical connection | screw-type terminals |
| Conductor cross-section, solid | 1x (20 ... 14), 2x (20 ... 16) |
| Conductor cross-section, stranded | 1x (20 ... 14), 2x (20 ... 18) |
| Conductor cross-section, with ferrule | 1x (0.5 ... 2.5 mm²), 2x (0.5 ... 1 mm²) |
| Plug-in socket connection | No |
| Parameter | Value |
|---|---|
| Touch protection against electric shock | finger-safe |
| Fastening method | snap-on mounting |
| Mounting position | any |
| Width | 22.5 mm |
| Height | 103.6 mm |
| Depth | 118 mm |
| Parameter | Value |
|---|---|
| Operating temperature range | -25 ... +60 °C |
| Storage temperature range | -40 ... +80 °C |
| Relative humidity, operating | 10 ... 95 % |
| Enclosure protection rating (IP) | IP40 |
| Installation altitude, max. | 2 000 m |
| Shock resistance | 15g / 11 ms |
| Vibration resistance (IEC 60068-2-6) | 5 ... 500 Hz: 0.75 mm |
| Air pressure (SN 31205) | 90 ... 106 kPa |
| EMC / emitted interference standards | IEC 60947-5-1, IEC 61000 |
| Parameter | Value |
|---|---|
| UL approval | Yes |
| Parameter | Value |
|---|---|
| Electrical Endurance (Operating Cycles) Typical | 200 000 |
MPN
3TK2820-1AJ20