Siemens SIRIUS motor protection circuit breaker, 3RV2021-4BA15, 45 mm wide, Trip Class 10, 100 kA at 240 V, phase failure detection.
| Parameter | Value |
|---|---|
| Series | SIRIUS |
| Product designation | Circuit breaker |
| Frame size | S0 |
| Parameter | Value |
|---|---|
| Rated operational current (Ie) | 20 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) | 10.5 W |
| Power loss, per pole (AC, hot) | 3.5 W |
| Parameter | Value |
|---|---|
| Overload release setting range | 13 ... 20 A |
| Instantaneous short-circuit trip current | 260 A |
| Trip class | CLASS 10 |
| Breaking capacity at 240 V (AC) | 100 kA |
| Breaking capacity at 400 V (AC) | 55 kA |
| Breaking capacity at 500 V (AC) | 10 kA |
| Breaking capacity at 690 V (AC) | 4 kA |
| Breaking capacity at 240 V | 100 kA |
| Breaking capacity at 690 V | 2 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.) | 100 000 |
| Endurance, auxiliary contacts (typ.) | 100 000 |
| Switching frequency, AC-3 (max.) | 15 1/h |
| Auxiliary CO (changeover) contacts | 0 |
| Parameter | Value |
|---|---|
| Main-circuit terminal type | screw-type terminals |
| Main-circuit connector arrangement | Top and bottom |
| Conductor cross-section, solid / stranded | 2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²) |
| Conductor cross-section, finely stranded with ferrule | 2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²) |
| Conductor range, AWG (main contacts) | 2x (16 ... 12), 2x (14 ... 8) |
| Parameter | Value |
|---|---|
| Height | 97 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 | -20 ... +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 |
It carries a Trip Class 10 and includes phase failure detection, so it drops the motor on a lost phase before the winding heats up. Rated breaking capacity hits 100 kA at 240 V, 25 kA at 400 V, and 2 kA at 690 V — enough to handle high-fault panels without an upstream fuse in many cases. The 45 mm width takes up one standard module slot.
This part is listed as current production. We source it to order against an RFQ; lead time depends on factory backlog and your quantity.
Yes, it mounts on 35 mm DIN rail per DIN EN 60715 using screw or snap-on fastening. Mounting position is any orientation.
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