Siemens SIRIUS 3RR2 current monitoring relays mount directly on 3RT2 contactors and 3RU2 overload relays to monitor motor current: detect underload, belt breakage, dry running or overload.
Technical data
| Series | 3RR21 / 3RR22 / 3RR24 |
|---|---|
| Product type | Current monitoring relay, mounts directly on 3RT2 contactor / 3RU2 overload relay |
| Measuring range | 1.6–16 A (S00), 4–40 A (S0), 8–80 A (S2) |
| Monitoring | Under/overcurrent, active or apparent current, phase sequence, residual current, blocking current (by model) |
| Output | 1 CO (+ 1 semiconductor output, 3RR22/3RR24) |
| Communication | IO-Link (3RR24) |
| Connection | Screw or spring-loaded terminals |
Article numbers
| Version | Size | Measuring range | Hysteresis | Supply | Screw | Spring-loaded |
|---|---|---|---|---|---|---|
| 3RR21 Basic (analog, 2-phase, apparent current) | S00 | 1.6–16 A | 6.25% of threshold | 24 V AC/DC | 3RR2141-1AA30 | 3RR2141-2AA30 |
| 3RR21 Basic (analog, 2-phase, apparent current) | S00 | 1.6–16 A | 6.25% of threshold | 24–240 V AC/DC | 3RR2141-1AW30 | 3RR2141-2AW30 |
| 3RR21 Basic (analog, 2-phase, apparent current) | S0 | 4–40 A | 6.25% of threshold | 24 V AC/DC | 3RR2142-1AA30 | 3RR2142-2AA30 |
| 3RR21 Basic (analog, 2-phase, apparent current) | S0 | 4–40 A | 6.25% of threshold | 24–240 V AC/DC | 3RR2142-1AW30 | 3RR2142-2AW30 |
| 3RR21 Basic (analog, 2-phase, apparent current) | S2 | 8–80 A | 6.25% of threshold | 24 V AC/DC | 3RR2143-1AA30 | 3RR2143-3AA30 |
| 3RR21 Basic (analog, 2-phase, apparent current) | S2 | 8–80 A | 6.25% of threshold | 24–240 V AC/DC | 3RR2143-1AW30 | 3RR2143-3AW30 |
| 3RR22 Standard (digital, LCD, 3-phase, active/apparent current) | S00 | 1.6–16 A | 0.1–3 A | 24 V AC/DC | 3RR2241-1FA30 | 3RR2241-2FA30 |
| 3RR22 Standard (digital, LCD, 3-phase, active/apparent current) | S00 | 1.6–16 A | 0.1–3 A | 24–240 V AC/DC | 3RR2241-1FW30 | 3RR2241-2FW30 |
| 3RR22 Standard (digital, LCD, 3-phase, active/apparent current) | S0 | 4–40 A | 0.1–8 A | 24 V AC/DC | 3RR2242-1FA30 | 3RR2242-2FA30 |
| 3RR22 Standard (digital, LCD, 3-phase, active/apparent current) | S0 | 4–40 A | 0.1–8 A | 24–240 V AC/DC | 3RR2242-1FW30 | 3RR2242-2FW30 |
| 3RR22 Standard (digital, LCD, 3-phase, active/apparent current) | S2 | 8–80 A | 0.2–16 A | 24 V AC/DC | 3RR2243-1FA30 | 3RR2243-3FA30 |
| 3RR22 Standard (digital, LCD, 3-phase, active/apparent current) | S2 | 8–80 A | 0.2–16 A | 24–240 V AC/DC | 3RR2243-1FW30 | 3RR2243-3FW30 |
| 3RR24 IO-Link (digital, LCD, 3-phase, counters) | S00 | 1.6–16 A | 0.1–3 A | 24 V DC | 3RR2441-1AA40 | 3RR2441-2AA40 |
| 3RR24 IO-Link (digital, LCD, 3-phase, counters) | S0 | 4–40 A | 0.1–8 A | 24 V DC | 3RR2442-1AA40 | 3RR2442-2AA40 |
| 3RR24 IO-Link (digital, LCD, 3-phase, counters) | S2 | 8–80 A | 0.2–16 A | 24 V DC | 3RR2443-1AA40 | 3RR2443-3AA40 |
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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