• Siemens SIRIUS 3RR21 / 3RR22 Current Monitoring Relays (1.6-80 A)
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Siemens SIRIUS 3RR21 / 3RR22 Current Monitoring Relays (1.6-80 A)

Siemens SIRIUS 3RR21 / 3RR22 Current Monitoring Relays (1.6-80 A)

SIRIUS 3RR21 and 3RR22 current and active current monitoring relays for direct mounting on 3RT2 contactors sizes S00 to S2.

Key features

  • Basic versions 3RR21: analog setting, 2-phase apparent current monitoring
  • Standard versions 3RR22: digital setting, LC display, 3-phase active or apparent current
  • Phase sequence, residual current and blocking current monitoring (3RR22)
  • Measuring ranges 1.6 ... 16 A, 4 ... 40 A and 8 ... 80 A
  • Supply 24 V AC/DC or 24 ... 240 V AC/DC
  • Screw or spring-loaded terminals

Specifications

Brand Siemens
Product line SIRIUS 3RR2
Function Current / active current monitoring
Mounting On 3RT2 contactors or stand-alone
Category Monitoring Relays
Source Siemens Catalog IC 10 · 2026, p. 953
3RR2141-1AA30 Version: Basic | Size: S00 | Measuring range: 1.6 ... 16 A | Hysteresis: 6.25% of threshold | Supply: 24 V AC/DC | Connection: Screw
3RR2141-2AA30 Version: Basic | Size: S00 | Measuring range: 1.6 ... 16 A | Hysteresis: 6.25% of threshold | Supply: 24 V AC/DC | Connection: Spring-loaded
3RR2141-1AW30 Version: Basic | Size: S00 | Measuring range: 1.6 ... 16 A | Hysteresis: 6.25% of threshold | Supply: 24 ... 240 V AC/DC | Connection: Screw
3RR2141-2AW30 Version: Basic | Size: S00 | Measuring range: 1.6 ... 16 A | Hysteresis: 6.25% of threshold | Supply: 24 ... 240 V AC/DC | Connection: Spring-loaded
3RR2142-1AA30 Version: Basic | Size: S0 | Measuring range: 4 ... 40 A | Hysteresis: 6.25% of threshold | Supply: 24 V AC/DC | Connection: Screw
3RR2142-2AA30 Version: Basic | Size: S0 | Measuring range: 4 ... 40 A | Hysteresis: 6.25% of threshold | Supply: 24 V AC/DC | Connection: Spring-loaded
3RR2142-1AW30 Version: Basic | Size: S0 | Measuring range: 4 ... 40 A | Hysteresis: 6.25% of threshold | Supply: 24 ... 240 V AC/DC | Connection: Screw
3RR2142-2AW30 Version: Basic | Size: S0 | Measuring range: 4 ... 40 A | Hysteresis: 6.25% of threshold | Supply: 24 ... 240 V AC/DC | Connection: Spring-loaded
3RR2143-1AA30 Version: Basic | Size: S2 | Measuring range: 8 ... 80 A | Hysteresis: 6.25% of threshold | Supply: 24 V AC/DC | Connection: Screw
3RR2143-3AA30 Version: Basic | Size: S2 | Measuring range: 8 ... 80 A | Hysteresis: 6.25% of threshold | Supply: 24 V AC/DC | Connection: Spring-loaded
3RR2143-1AW30 Version: Basic | Size: S2 | Measuring range: 8 ... 80 A | Hysteresis: 6.25% of threshold | Supply: 24 ... 240 V AC/DC | Connection: Screw
3RR2143-3AW30 Version: Basic | Size: S2 | Measuring range: 8 ... 80 A | Hysteresis: 6.25% of threshold | Supply: 24 ... 240 V AC/DC | Connection: Spring-loaded
3RR2241-1FA30 Version: Standard | Size: S00 | Measuring range: 1.6 ... 16 A | Hysteresis: 0.1 ... 3 A | Supply: 24 V AC/DC | Connection: Screw
3RR2241-2FA30 Version: Standard | Size: S00 | Measuring range: 1.6 ... 16 A | Hysteresis: 0.1 ... 3 A | Supply: 24 V AC/DC | Connection: Spring-loaded
3RR2241-1FW30 Version: Standard | Size: S00 | Measuring range: 1.6 ... 16 A | Hysteresis: 0.1 ... 3 A | Supply: 24 ... 240 V AC/DC | Connection: Screw
3RR2241-2FW30 Version: Standard | Size: S00 | Measuring range: 1.6 ... 16 A | Hysteresis: 0.1 ... 3 A | Supply: 24 ... 240 V AC/DC | Connection: Spring-loaded
3RR2242-1FA30 Version: Standard | Size: S0 | Measuring range: 4 ... 40 A | Hysteresis: 0.1 ... 8 A | Supply: 24 V AC/DC | Connection: Screw
3RR2242-2FA30 Version: Standard | Size: S0 | Measuring range: 4 ... 40 A | Hysteresis: 0.1 ... 8 A | Supply: 24 V AC/DC | Connection: Spring-loaded
3RR2242-1FW30 Version: Standard | Size: S0 | Measuring range: 4 ... 40 A | Hysteresis: 0.1 ... 8 A | Supply: 24 ... 240 V AC/DC | Connection: Screw
3RR2242-2FW30 Version: Standard | Size: S0 | Measuring range: 4 ... 40 A | Hysteresis: 0.1 ... 8 A | Supply: 24 ... 240 V AC/DC | Connection: Spring-loaded
3RR2243-1FA30 Version: Standard | Size: S2 | Measuring range: 8 ... 80 A | Hysteresis: 0.2 ... 16 A | Supply: 24 V AC/DC | Connection: Screw
3RR2243-3FA30 Version: Standard | Size: S2 | Measuring range: 8 ... 80 A | Hysteresis: 0.2 ... 16 A | Supply: 24 V AC/DC | Connection: Spring-loaded
3RR2243-1FW30 Version: Standard | Size: S2 | Measuring range: 8 ... 80 A | Hysteresis: 0.2 ... 16 A | Supply: 24 ... 240 V AC/DC | Connection: Screw
3RR2243-3FW30 Version: Standard | Size: S2 | Measuring range: 8 ... 80 A | Hysteresis: 0.2 ... 16 A | Supply: 24 ... 240 V AC/DC | Connection: Spring-loaded
Monitoring RelaysSiemens
24 product codes available in this family
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Siemens SIRIUS 3RR21 / 3RR22 Current Monitoring Relays (1.6-80 A)

Brand Siemens·Monitoring Relays

Available part numbers (24)

3RR2141-1AA30, 3RR2141-2AA30, 3RR2141-1AW30, 3RR2141-2AW30, 3RR2142-1AA30, 3RR2142-2AA30, 3RR2142-1AW30, 3RR2142-2AW30, 3RR2143-1AA30, 3RR2143-3AA30 + 14 more — see full table ↓

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Product codes & specifications
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Product codeSpec
3RR2141-1AA30Version: Basic | Size: S00 | Measuring range: 1.6 ... 16 A | Hysteresis: 6.25% of threshold | Supply: 24 V AC/DC | Connection: Screw
3RR2141-2AA30Version: Basic | Size: S00 | Measuring range: 1.6 ... 16 A | Hysteresis: 6.25% of threshold | Supply: 24 V AC/DC | Connection: Spring-loaded
3RR2141-1AW30Version: Basic | Size: S00 | Measuring range: 1.6 ... 16 A | Hysteresis: 6.25% of threshold | Supply: 24 ... 240 V AC/DC | Connection: Screw
3RR2141-2AW30Version: Basic | Size: S00 | Measuring range: 1.6 ... 16 A | Hysteresis: 6.25% of threshold | Supply: 24 ... 240 V AC/DC | Connection: Spring-loaded
3RR2142-1AA30Version: Basic | Size: S0 | Measuring range: 4 ... 40 A | Hysteresis: 6.25% of threshold | Supply: 24 V AC/DC | Connection: Screw
3RR2142-2AA30Version: Basic | Size: S0 | Measuring range: 4 ... 40 A | Hysteresis: 6.25% of threshold | Supply: 24 V AC/DC | Connection: Spring-loaded
3RR2142-1AW30Version: Basic | Size: S0 | Measuring range: 4 ... 40 A | Hysteresis: 6.25% of threshold | Supply: 24 ... 240 V AC/DC | Connection: Screw
3RR2142-2AW30Version: Basic | Size: S0 | Measuring range: 4 ... 40 A | Hysteresis: 6.25% of threshold | Supply: 24 ... 240 V AC/DC | Connection: Spring-loaded
3RR2143-1AA30Version: Basic | Size: S2 | Measuring range: 8 ... 80 A | Hysteresis: 6.25% of threshold | Supply: 24 V AC/DC | Connection: Screw
3RR2143-3AA30Version: Basic | Size: S2 | Measuring range: 8 ... 80 A | Hysteresis: 6.25% of threshold | Supply: 24 V AC/DC | Connection: Spring-loaded
3RR2143-1AW30Version: Basic | Size: S2 | Measuring range: 8 ... 80 A | Hysteresis: 6.25% of threshold | Supply: 24 ... 240 V AC/DC | Connection: Screw
3RR2143-3AW30Version: Basic | Size: S2 | Measuring range: 8 ... 80 A | Hysteresis: 6.25% of threshold | Supply: 24 ... 240 V AC/DC | Connection: Spring-loaded
3RR2241-1FA30Version: Standard | Size: S00 | Measuring range: 1.6 ... 16 A | Hysteresis: 0.1 ... 3 A | Supply: 24 V AC/DC | Connection: Screw
3RR2241-2FA30Version: Standard | Size: S00 | Measuring range: 1.6 ... 16 A | Hysteresis: 0.1 ... 3 A | Supply: 24 V AC/DC | Connection: Spring-loaded
3RR2241-1FW30Version: Standard | Size: S00 | Measuring range: 1.6 ... 16 A | Hysteresis: 0.1 ... 3 A | Supply: 24 ... 240 V AC/DC | Connection: Screw
3RR2241-2FW30Version: Standard | Size: S00 | Measuring range: 1.6 ... 16 A | Hysteresis: 0.1 ... 3 A | Supply: 24 ... 240 V AC/DC | Connection: Spring-loaded
3RR2242-1FA30Version: Standard | Size: S0 | Measuring range: 4 ... 40 A | Hysteresis: 0.1 ... 8 A | Supply: 24 V AC/DC | Connection: Screw
3RR2242-2FA30Version: Standard | Size: S0 | Measuring range: 4 ... 40 A | Hysteresis: 0.1 ... 8 A | Supply: 24 V AC/DC | Connection: Spring-loaded
3RR2242-1FW30Version: Standard | Size: S0 | Measuring range: 4 ... 40 A | Hysteresis: 0.1 ... 8 A | Supply: 24 ... 240 V AC/DC | Connection: Screw
3RR2242-2FW30Version: Standard | Size: S0 | Measuring range: 4 ... 40 A | Hysteresis: 0.1 ... 8 A | Supply: 24 ... 240 V AC/DC | Connection: Spring-loaded
3RR2243-1FA30Version: Standard | Size: S2 | Measuring range: 8 ... 80 A | Hysteresis: 0.2 ... 16 A | Supply: 24 V AC/DC | Connection: Screw
3RR2243-3FA30Version: Standard | Size: S2 | Measuring range: 8 ... 80 A | Hysteresis: 0.2 ... 16 A | Supply: 24 V AC/DC | Connection: Spring-loaded
3RR2243-1FW30Version: Standard | Size: S2 | Measuring range: 8 ... 80 A | Hysteresis: 0.2 ... 16 A | Supply: 24 ... 240 V AC/DC | Connection: Screw
3RR2243-3FW30Version: Standard | Size: S2 | Measuring range: 8 ... 80 A | Hysteresis: 0.2 ... 16 A | Supply: 24 ... 240 V AC/DC | Connection: Spring-loaded

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