Siemens 3RV2031-4PB10: High-Power Motor Protection Circuit Breaker
Heavy-Duty Motor Protection for Demanding Applications
When industrial motors drive critical processes at high power levels, standard circuit breakers are not sufficient. The Siemens SIRIUS 3RV2031-4PB10 is engineered for high-power motors, delivering up to 100kA breaking capacity and precise overload protection — setting the benchmark for industrial-grade motor circuit protection.
3RV2031-4PB10 Technical Specifications
| Parameter | Specification |
|---|---|
| Model | 3RV2031-4PB10 |
| Rated Current Range | 27-32A (adjustable) |
| Breaking Capacity | 100kA @ 400V AC |
| Poles | 3-pole |
| Size | S2 (55mm width) |
| Mounting | DIN rail or screw mounting |
| Trip Class | CLASS 10 / 20 selectable |
Comparison with Other 3RV2 Series Models
| Model | Current Range | Size | Max Motor Power |
|---|---|---|---|
| 3RV2011 | 0.11-16A | S00 (45mm) | Up to 7.5kW |
| 3RV2021 | 1.4-25A | S0 (45mm) | Up to 11kW |
| 3RV2031 | 10-100A | S2 (55mm) | Up to 45kW |
| 3RV2041 | 70-100A | S3 (70mm) | Up to 55kW |
The 3RV2031-4PB10 sits in the S2 size category, ideal for motors in the 15-45kW range. Its adjustable current range of 27-32A makes it suitable for motors drawing approximately 27-32A at full load.
Installation Considerations
- Temperature derating: For ambient temperatures above 40 degrees C, apply derating factors. Multiple units mounted side by side require additional derating (typically 10-20%).
- Altitude derating: Above 2000m elevation, both breaking capacity and rated current require derating.
- Wire routing direction: The 3RV series supports both top-in/bottom-out and bottom-in/top-out wiring, but note that breaking capacity may differ between configurations.
- Auxiliary contacts: Add auxiliary contact modules and trip alarm contacts for remote status monitoring integration.
Why the 3RV Series Excels in Industrial Applications
- Precise motor protection curves: Trip characteristics are engineered specifically for motor thermal protection, unlike standard MCBs designed for cable protection.
- Built-in phase-loss protection: Differential trip mechanism detects phase loss and trips automatically, preventing motor burnout from single-phase operation.
- Ambient temperature compensation: Maintains protection accuracy across -20 to +60 degrees C operating range.
- Selectable trip class: CLASS 10 for standard applications, CLASS 20 for heavy-start loads — configurable on the device.
Frequently Asked Questions
What motor size is the 3RV2031-4PB10 designed for?
The 3RV2031-4PB10 with its 27-32A adjustable range is suitable for three-phase motors rated approximately 15-18.5kW at 400V AC. Always verify the motor full-load current on the nameplate and set the breaker dial accordingly. The S2 size category (55mm width) provides the robust construction needed for higher-current applications.
How does the selectable trip class work?
The 3RV2031 supports both CLASS 10 and CLASS 20 trip characteristics. CLASS 10 trips at 7.2x rated current within 4-10 seconds, suitable for standard motors. CLASS 20 allows up to 20 seconds, designed for heavy-start loads with extended acceleration times. Select the class based on your motor starting characteristics to prevent nuisance tripping while maintaining protection.
Can I add remote reset capability?
Yes, the 3RV2031 supports optional motor operator modules for remote reset. Additionally, auxiliary trip alarm contacts can signal a PLC when the breaker trips, enabling automated fault response and remote status monitoring. This is particularly valuable in large installations where manual inspection of every breaker would be time-consuming.
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