Siemens SIRIUS 3RS2 temperature monitoring relays: monitor temperature with Pt100, Pt1000, KTY, NTC and type J, K, T, E, N, S, R, B thermocouples and switch the output relay at set thresholds. Ideal for over-temperature protection in furnace and thermal process applications.
Technical data
| Series | 3RS25 / 3RS26 / 3RS28 / 3RS29 |
|---|---|
| Product type | Temperature monitoring relay |
| Sensors | Pt100, Pt1000, KTY83-110, KTY84, NTC, thermocouples J, K, T, E, N, S, R, B (depending on model) |
| Thresholds | 1 (3RS25) or 2 (3RS26/3RS28) |
| Communication | IO-Link (3RS28) |
| Supply | 24 V AC/DC, 24–240 V AC/DC or 24 V DC |
| Connection | Screw or spring-loaded (push-in) terminals |
| Typical use | Temperature limit monitoring in furnace, drying, heating and cooling processes |
Article numbers
| Version | Sensor type | Supply | Screw | Spring-loaded (push-in) |
|---|---|---|---|---|
| Analog multifunction, 1 sensor, 1 threshold | Pt100; thermocouple J, K | 24 V AC/DC | 3RS2500-1AA30 | 3RS2500-2AA30 |
| Analog multifunction, 1 sensor, 1 threshold | Pt100; thermocouple J, K | 24–240 V AC/DC | 3RS2500-1AW30 | 3RS2500-2AW30 |
| Digital, 1 sensor, 2 thresholds | Pt100, Pt1000, KTY83-110, KTY84, NTC; thermocouple J, K, T, E, N, S, R, B | 24 V AC/DC | 3RS2600-1BA30 | 3RS2600-2BA30 |
| Digital, 1 sensor, 2 thresholds | Pt100, Pt1000, KTY83-110, KTY84, NTC; thermocouple J, K, T, E, N, S, R, B | 24–240 V AC/DC | 3RS2600-1BW30 | 3RS2600-2BW30 |
| Digital, IO-Link, 1 sensor, 2 thresholds | Pt100, Pt1000, KTY83-110, KTY84, NTC; thermocouple J, K, T, E, N, S, R, B | 24 V DC | 3RS2800-1BA40 | 3RS2800-2BA40 |
| Sensor expansion module (for 3RS26/3RS28), +2 sensors, 4–20 mA analog input, status relay | Pt100, Pt1000, KTY83-110, KTY84, NTC | 24 V AC/DC | 3RS2900-1AA30 | 3RS2900-2AA30 |
| Sensor expansion module (for 3RS26/3RS28), +2 sensors, 4–20 mA analog input, status relay | Pt100, Pt1000, KTY83-110, KTY84, NTC | 24–240 V AC/DC | 3RS2900-1AW30 | 3RS2900-2AW30 |
Technical data and article numbers are based on Siemens catalog IC 10 · 2026 (chapter 10, monitoring and control devices) and are for information only. Image is representative.
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Tags: 3RS2 temperature relay, siemens temperature relay, 3RS2, pt100 relay, thermocouple relay, 3RS2500-1AA30, 3RS2500-2AA30, 3RS2500-1AW30, 3RS2500-2AW30, 3RS2600-1BA30, 3RS2600-2BA30, 3RS2600-1BW30, 3RS2600-2BW30, 3RS2800-1BA40, 3RS2800-2BA40, 3RS2900-1AA30, 3RS2900-2AA30, 3RS2900-1AW30, 3RS2900-2AW30