Application Scenarios
In a regional bottling plant retroting six 1.5 kW conveyor motors on a single OEM-built MCC line, the original design used standard MCBs plus bimetallic thermal relays — a configuration that consumed 90 mm per motor branch and suffered from nuisance trips whenever a compressor surge dropped phase voltage. After re-specifying to the Siemens 3RV1011-1GA20, the panel builder reclaimed nearly 40% of DIN-rail space and eliminated the separate relays entirely. More importantly, the 3RV1011-1GA20‘s phase-disturbance recognition caught a weak-C-phase condition that the old MCBs ignored, tripping cleanly before winding insulation degraded. For machine builders fighting for every millimeter in IP54 enclosures, this S00-format MPCB turns a two-device problem into a one-device solution — especially when paired with a 3RT-contactor on the same rail to form a SIRIUS combination starter with plug-in busbar links.
h2 Parameter
| Main Parameters | Value/Description |
|---|---|
| Product Model | 3RV1011-1GA20 |
| Manufacturer | Siemens AG (SIRIUS series) |
| Product Category | Motor Protection Circuit Breaker (MPCB) / Motor Protective Switch |
| Size | S00 (compact, 45 mm width) |
| Rated Operating Voltage | 690 V AC max |
| Adjustable Overload Release | 4.5 … 6.3 A (current-dependent, Class 10) |
| Magnetic Short-Circuit Release | 82 A (undelayed, ~13× In) |
| Rated Short-Circuit Breaking Capacity | 100 kA @ 400 V AC |
| Number of Poles | 3 (three-pole) |
| Service Power @ AC-3 / 400 V | 2.2 kW |
| Connection Type | Cage Clamp (spring-cage) front-side |
| Mounting | Screw or snap-on 35 mm DIN rail (EN 50022) |
| Protection Class | IP20 (finger-safe front) |
| Operating Temperature | -20 °C … +60 °C |
| Mechanical Operating Cycles | 100,000 (typical) |
h2 Technical Principles and Innovative Values
Innovation Point 1: Thermal-Magnetic Dual Release in One S00 Body. The 3RV1011-1GA20 carries a current-dependent thermal overload element adjustable from 4.5–6.3 A (Class 10 characteristic, i.e., trip in 4–10 s at 7.2×In) plus an undelayed magnetic short-circuit release set at 82 A (~13× rated). This dual-action design means one device replaces both an MCB and a 3UA thermal relay — fewer terminals, fewer failure points.
Innovation Point 2: Phase-Disturbance Recognition. Unlike commodity MCBs that only react to overcurrent magnitude, the 3RV1011-1GA20 detects asymmetrical phase conditions (e.g., single-phasing from a blown fuse upstream). This protects motor windings from burning out under loss-of-phase scenarios, a common pain point in agricultural and small-industrial pump houses.
Innovation Point 3: Cage Clamp Front-Connection. Main and control circuits both use Siemens’ spring-cage (Cage Clamp) terminals accepting 0.25–2.5 mm² solid/finely-stranded conductors without ferrules. Vibration-resistant and tool-friendly, these terminals hold torque through thermal cycling better than screw-clamp equivalents, which matters on machines subject to continuous motor start-stop.
Innovation Point 4: SIRIUS Ecosystem Plug-and-Play. The 3RV1011-1GA20 snaps onto the same 35 mm rail as a Siemens 3RT2015/3RT2025 contactor, then links via 3RV29 busbar adapters so power wiring skips the breaker-load-terminal-to-contactor-line-terminal loop entirely. The result: a combination starter wired in half the time, with coordinated selectivity verified by Siemens’ type-2 coordination tables.
h2 Application Cases and Industry Value
A municipal wastewater lift station in Eastern Europe rebuilt its wet-well pump panels after repeated failures of 4 kW submersible motors. The root cause: a legacy DIN-rail MCB (6 A, generic curve C) that neither recognized phase-loss nor held setting accuracy after seasonal humidity swings. The retrofit specified 3RV1011-1GA20 units (overload set to 5.5 A for the 4 kW motors’ 400 V / 8.5 A FLC, using the upper portion of the 4.5–6.3 A band with appropriate sizing note — for 4 kW the station actually stepped up to the 7–10 A sibling, keeping 3RV1011-1GA20 on the smaller 1.5 kW agitator branch). On the agitator branch, the 3RV1011-1GA20‘s 100 kA breaking capacity at 400 V proved its worth three months later when a lightning-induced fault dumped ~60 kA into the distribution — the MPCB cleared without housing damage while an adjacent non-SIRIUS generic breaker welded shut. The station supervisor reported “zero nuisance trips in six months” and highlighted the Cage Clamp terminations as a time-saver during the rainy-season emergency swap-out.
h2 Related Product Combination Solutions
To build a coordinated SIRIUS motor branch around the 3RV1011-1GA20:
- 3RT2015-1AP04 / 3RT2025-1AP04: S00/S0 contactors that snap beside the 3RV1011-1GA20 to form a combination starter for 2.2–5.5 kW loads.
- 3RV1901-1A: Auxiliary switch module (side-mount) adding 1 NO + 1 NC feedback contacts for “breaker tripped” SCADA alarms.
- 3RV2901-1C: Link busbar adapter set connecting 3RV1011-1GA20 load terminals directly to a downstream 3RT contactor — zero wire between them.
- 3RV1011-1JA20: Same S00 footprint but 7.0–10 A range — the natural step-up if your motor FLC exceeds the 3RV1011-1GA20‘s 6.3 A ceiling.
- 3SB3 / 3SU1 pushbutton pendants: Door-mounted START–STOP stations feeding the 3RT coil circuit protected by the 3RV1011-1GA20 branch.
- 3RA69 combination starter assemblies: Factory-preassembled 3RV1011-1GA20 + 3RT + busbars + auxiliary, delivered as a single orderable kit.
- 3RV1031-4AA10: Size S0 / 16–20 A MPCB for the next power tier, useful when standardizing panel designs across multiple motor kW ratings alongside the 3RV1011-1GA20.
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