SIEMENS
Monitoring relay for Siemens 3RT2 Size S0 contactors with analog apparent current monitoring (4–40 A), 24–240 V AC/DC supply, phase failure detection, cable break detection, ON delay (0–60 s), noise suppression (0–30 s), and 1 change-over contact with screw terminals.
The Siemens 3RR2142-1AW30 is a high-performance monitoring relay designed for precise current monitoring in industrial control systems. Engineered for seamless mounting to Siemens 3RT2 contactors (Size S0), this device ensures reliable operation and long-term stability across a wide range of applications. With analog adjustment and advanced detection features, it provides accurate monitoring of apparent current between 4…40 A at 50/60 Hz, making it ideal for safeguarding motors, equipment, and electrical infrastructure.
Enhanced protection against current overshoot, undershoot, and phase failure
Easy integration with Siemens 3RT2 Size S0 contactors
Flexible supply voltage range of 24–240 V AC/DC, suitable for diverse installations
Improved system reliability using fault buffer and phase-failure detection
User-friendly configuration with analog adjustment and screw connection system
Minimizes downtime by detecting cable breaks and noise pulses
Customizable delay settings for optimized performance (ON delay 0–60 s / noise suppression 0–30 s)
Apparent Current Monitoring: 4…40 A with high accuracy
2-Phase Monitoring: Ensures stable performance even in demanding electrical systems
Fault Detection:
Current overshoot
Current undershoot
Phase failure
Cable break
Optional fault buffer
Output Contact: 1 change-over relay contact
Adjustable Timers:
ON delay: 0–60 seconds
Noise pulse suppression: 0–30 seconds
Switching Hysteresis: 6% for stable switching behavior
Connection Type: Reliable screw terminals
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| SKU / Model | 3RR2142-1AW30 |
|---|---|
| Brand | SIEMENS |
| product brand name | SIRIUS |
| product designation | Monitoring relays |
| design of the product | analogically adjustable, 2-phase current monitoring |
| product type designation | 3RR2 |
| size of contactor can be combined company-specific | S0 |
| operating apparent power rated value | 4 V·A |
| insulation voltage for overvoltage category III according to IEC 60664 | - |
| ● with degree of pollution 3 rated value | 690 V |
| surge voltage resistance rated value | 6 kV |
| protection class IP | - |
| ● on the front | IP20 |
| ● of the terminal | IP20 |
| shock resistance | 15g / 11 ms |
| vibration resistance | 10 ... 55 Hz / 0.35 mm |
| mechanical service life (switching cycles) typical | 10 000 000 |
| electrical endurance (switching cycles) at AC-15 at 230 V typical | 100 000 |
| reference code acc. to IEC 81346-2 | K |
| relative repeat accuracy | 2 % |
| type of voltage of the supply voltage | AC/DC |
| supply voltage 1 at AC | - |
| ● at 50 Hz | 24 ... 240 V |
| ● at 60 Hz | 24 ... 240 V |
| supply voltage 1 at DC | 24 ... 240 V |
| supply voltage frequency 1 | 50 ... 60 Hz |
| type of current for monitoring | AC |
| adjustable current response value current | - |
| ● 1 | 4 ... 40 A |
| ● 2 | 4 ... 40 A |
| adjustable response delay time | - |
| ● when starting | 0 ... 60 s |
| ● with lower or upper limit violation | 0 ... 30 s |
| temperature drift per °C | 0.1 %/°C |
| protocol is supported IO-Link protocol | No |
| type of voltage supply via input/output link master | No |
| number of CO contacts | - |
| operational current of auxiliary contacts at AC-15 | - |
| ● at 230 V | 3 A |
| ● at 400 V | 3 A |
| operational current of auxiliary contacts at DC-13 | - |
| ● at 24 V | 1 A |
| ● at 125 V | 0.2 A |
| ● at 250 V | 0.1 A |
| contact rating of auxiliary contacts according to UL | B300 / R300 |
| operating power rated value | 2.5 W |
| ampacity of the semiconductor output in SIO mode | 200 mA |
| operational current at 17 V minimum | 5 mA |
| EMC emitted interference acc. to IEC 60947-1 | ambience A (industrial sector) |
| EMC immunity acc. to IEC 60947-1 | ambience A (industrial sector) |
| product component removable terminal for main circuit | No |
| product component removable terminal for auxiliary and control circuit | Yes |
| type of electrical connection | - |
| ● for main current circuit | screw-type terminals |
| ● for auxiliary and control circuit | screw-type terminals |
| ● for main contacts | - |
| ● at AWG cables for main contacts | 2 x (16 ... 14), 2x (14 ... 8) |
| connectable conductor cross-section for main contacts | - |
| ● solid or stranded | 1 ... 10 mm² |
| ● finely stranded with core end processing | 2.5 ... 10 mm² |
| type of connectable conductor cross-sections | - |
| ● for auxiliary contacts | - |
| — solid | 1x (0.5 ... 4 mm²), 2x (0.5 ... 2.5 mm²) |
| — finely stranded with core end processing | 1x (0.5 ... 2.5 mm²), 2x (0.5 ... 1.5 mm²) |
| ● at AWG cables for auxiliary contacts | 2x (20 ... 14) |
| AWG number as coded connectable conductor cross section for main contacts | 16 ... 8 |
| tightening torque with screw-type terminals | 0.8 ... 1.2 N·m |
| mounting position | any |
| fastening method | direct mounting |
| required spacing | - |
| ● with side-by-side mounting | - |
| ● for grounded parts | - |
| ● for live parts | - |
| — forwards | 6 mm |
| — backwards | 0 mm |
| — upwards | 6 mm |
| — downwards | 6 mm |
| — at the side | 6 mm |
| installation altitude at height above sea level maximum | 2 000 m |
| ambient temperature | - |
| ● during operation | -25 ... +60 °C |
| ● during storage | -40 ... +80 °C |
| Test Certificates | Marine / Shipping |
| last modified: | 1/18/2021 |
| Weight | 0.260 kg |
| Dimensions | 99.00 × 115.00 × 57.00 mm |
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