Siemens SIRIUS 3RV2021-1KA20-0BA0, motor protection circuit breaker, size S0, Trip Class 10, 100 kA SCCR at 400 V AC, spring-loaded terminals, phase failure detection.
| Parameter | Value |
|---|---|
| Series | SIRIUS |
| Product designation | Circuit breaker |
| Frame size | S0 |
| Parameter | Value |
|---|---|
| Rated operational current (Ie) | 12.5 A |
| Rated voltage | 20 ... 690 V |
| Rated voltage, AC-3 (max.) | 690 V |
| Rated frequency | 50 ... 60 Hz |
| Rated insulation voltage (Ui), pollution degree 3 | 690 V |
| Rated impulse withstand voltage (Uimp) | 6 kV |
| Number of poles | 3 |
| Power loss (AC, hot) | 9.25 W |
| Power loss, per pole (AC, hot) | 3.1 W |
| Parameter | Value |
|---|---|
| Overload release setting range | 9 ... 12.5 A |
| Instantaneous short-circuit trip current | 163 A |
| Trip class | CLASS 10 |
| Breaking capacity at 240 V (AC) | 100 kA |
| Breaking capacity at 400 V (AC) | 100 kA |
| Breaking capacity at 500 V (AC) | 42 kA |
| Breaking capacity at 690 V (AC) | 6 kA |
| Breaking capacity at 240 V | 100 kA |
| Breaking capacity at 690 V | 4 kA |
| Short-circuit trip type | magnetic |
| Overload release type | thermal |
| Short-circuit protection | Yes |
| Phase-failure detection | Yes |
| Ground-fault detection | No |
| Auxiliary switch extendable | Yes |
| Parameter | Value |
|---|---|
| Endurance, main contacts (typ.) | 500 |
| Endurance, auxiliary contacts (typ.) | 500 |
| Switching frequency, AC-3 (max.) | 15 1/h |
| Auxiliary CO (changeover) contacts | 0 |
| Parameter | Value |
|---|---|
| Main-circuit terminal type | spring-loaded terminals |
| Main-circuit connector arrangement | Top and bottom |
| Conductor cross-section, solid / stranded | 2x (1 ... 10 mm²) |
| Conductor cross-section, finely stranded with ferrule | 2x (1 ... 6 mm²) |
| Parameter | Value |
|---|---|
| Height | 119 mm |
| Width | 45 mm |
| Depth | 97 mm |
| Mounting method | screw and snap-on mounting onto 35 mm DIN rail according to DIN EN 60715 |
| Mounting position | any |
| Parameter | Value |
|---|---|
| Operating temperature | -50 ... +60 °C |
| Storage temperature | -50 ... +80 °C |
| Transport temperature | -50 ... +80 °C |
| Relative humidity (operation) | 10 ... 95 % |
| Max. installation altitude | 2 000 m |
| Parameter | Value |
|---|---|
| Design Of The Product | For motor protection |
At 500 V the SCCR holds at 42 kA, and at 690 V it is 4 kA (AC) or 6 kA (AC depending on the cited entry), so the part is best deployed on 400 V or 480 V systems where its full interrupting capability is available.
Clearance requirements: 50 mm above and below, 30 mm to the side, zero forward or backward — so it fits tightly against a back panel or enclosure wall. The screwdriver shaft for the terminal clamps is 3 mm diameter, tip size 3.0 × 0.5 mm.
This part is sourced to order against an RFQ through independent distribution. Submit a request for quote; availability and current pricing are confirmed at quote time.
100 kA at 400 V AC, 42 kA at 500 V AC, and 4 kA (or 6 kA per one entry) at 690 V AC. The 100 kA rating at 400 V is the headline figure for panel coordination.
Yes, phase failure detection is built in. A lost phase on the line side will cause the breaker to trip, protecting the motor from single-phasing.
Width 45 mm, depth 97 mm, height 119 mm. Requires 50 mm clearance above and below, 30 mm to the side, zero forward or backward. Mounts on 35 mm DIN rail per DIN EN 60715.
Alternative models and sibling configurations in the same Siemens series. For obsolete or discontinued parts, these models can serve as compatible replacements or functional alternatives for plant maintenance.
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