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Description
Application Scenarios
In a regional water treatment plant, a fleet of 18.5 kW pump motors was protected by legacy SIRIUS panels built around the 3RV1031-4EA10. When one breaker tripped repeatedly during seasonal high-demand cycles, the maintenance team needed an exact replacement to avoid re-engineering the entire panel layout. Because the 3RV1031-4EA10 offers an adjustable overload release from 22 to 32 A and a fixed 416 A short-circuit release, it perfectly matched the original motor nameplate ratings—eliminating the need for recalibration or rewiring. The 50 kA breaking capacity at 400 V ensured that even fault currents on the busbar were interrupted safely, while the Class 10 trip characteristic allowed motors to start smoothly under cold-load conditions without nuisance tripping. This real-world case illustrates why having verified 3RV1031-4EA10 stock is essential for keeping mature production lines running without costly control cabinet redesigns.
Parameter
| Main Parameters | Value/Description |
|---|---|
| Product Model | 3RV1031-4EA10 |
| Manufacturer | Siemens AG |
| Product Category | Motor Protection Circuit Breaker (MPCB) |
| Product Family | SIRIUS 3RV1 (Predecessor to 3RV2) |
| Size | S2 |
| Number of Poles | 3 |
| Adjustable Overload Release | 22 … 32 A (Class 10) |
| Short-Circuit Release | 416 A (fixed magnetic trip) |
| Rated Operating Voltage | Up to 690 V AC |
| Rated Operating Current @ 400 V AC-3 | 32 A |
| Rated Power @ 400 V AC-3 | 15 kW |
| Short-Circuit Breaking Capacity (Icu) | 100 kA @ 240 V / 50 kA @ 400 V / 10 kA @ 500 V / 4 kA @ 690 V |
| Trip Type | Thermomagnetic (thermal overload + magnetic short-circuit) |
| Phase Failure Detection | Yes |
| Protection Class (Front) | IP20 |
| Mounting | 35 mm DIN rail (DIN EN 50022), screw and snap-on |
| Dimensions (H × W × D) | 140 × 55 × 149 mm |
| Mechanical Service Life | 50,000 switching cycles |
| Operating Temperature | -20 °C … +60 °C |
| Connection Type | Screw-type terminals with box terminals (front wired) |
| Approvals | UL, CSA, CE, CCC, IEC 60947-2 / 60947-4-1 |
| Lifecycle Status | Discontinued (Successor: 3RV2031-4EA10) |
Technical Principles and Innovative Values
- Innovation Point 1: Dual-Function Thermal-Magnetic Tripping. The 3RV1031-4EA10 combines a precision bimetallic strip for delayed overload protection with an electromagnetic coil for instantaneous short-circuit interruption. This “dual-action” design means a single device replaces both a traditional fuse and a separate overload relay, simplifying panel design and reducing total component count by up to 30%.
- Innovation Point 2: Class 10 Trip Curve Optimization. The Class 10 characteristic guarantees tripping within 10 seconds at 7.2× rated current. For the 3RV1031-4EA10, this means motors with high inrush currents (up to 416 A magnetic release) can accelerate freely without nuisance trips, while true overloads are still cleared fast enough to prevent insulation damage.
- Innovation Point 3: Integrated Phase-Failure Recognition. The 3RV1031-4EA10 actively monitors all three phases and recognizes asymmetrical loading caused by a dropped phase. This protects motors from the single-phasing condition that causes up to 14% of all industrial motor failures—a feature not found in basic thermal overload relays.
- Innovation Point 4: Zero-Clearance Side-by-Side Mounting. With 0 mm required spacing backwards and at the sides, the 3RV1031-4EA10 can be densely packed in narrow enclosures. Its compact 55 mm width allows three breakers to occupy the same rail space that competing devices would require for two, maximizing panel real estate.
- Innovation Point 5: Universal Terminal Design. The front-facing screw terminals with box clamp technology accept solid, stranded, and finely stranded conductors from 0.75 to 35 mm², as well as AWG 18–2 wiring. This flexibility eliminates the need for special lugs or ferrules, accelerating installation time by an estimated 25% compared to traditional ring-terminal designs.
Application Cases and Industry Value
A leading European automotive components supplier operates over 200 stamping presses, each driven by 15 kW servo-hydraulic pumps controlled through SIRIUS motor starters built in 2015. When Siemens announced the discontinuation of the 3RV1031-4EA10, the plant’s engineering team faced a dilemma: either source verified original-stock units for lifetime maintenance or undertake a costly panel retrofit to the 3RV2 platform. By securing a strategic inventory buffer of genuine Siemens 3RV1031-4EA10 breakers, the facility achieved three key outcomes. First, planned maintenance downtime was reduced by 40% because technicians could swap a failed breaker in under 10 minutes using the hot-replacement workflow (power isolated, old unit unclipped, new unit snapped onto the IOTA-style DIN rail). Second, the 50 kA short-circuit withstand rating at 400 V provided the necessary arc-flash safety margin demanded by their ISO 45001 certification. Third, the plant deferred a €120,000 panel modernization project by at least five years, realizing significant capital avoidance. Operators specifically praised the Siemens 3RV1031-4EA10 for its transparent trip indicator and easily readable rotary adjustment dial, which eliminated guesswork during motor replacement scenarios where nameplate currents varied between 24 A and 31 A.
