Siemens SIRIUS motor protection circuit breaker, 3RV2021-4FA15, Class 10 trip, 10 kA SCCR at 400 V, phase failure detection, screw and snap-on mounting on 35 mm DIN rail.
| Parameter | Value |
|---|---|
| Series | SIRIUS |
| Product designation | Circuit breaker |
| Frame size | S0 |
| Parameter | Value |
|---|---|
| Rated operational current (Ie) | 40 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) | 16.25 W |
| Power loss, per pole (AC, hot) | 5.4 W |
| Parameter | Value |
|---|---|
| Overload release setting range | 34 ... 40 A |
| Instantaneous short-circuit trip current | 480 A |
| Trip class | CLASS 10 |
| Breaking capacity at 240 V (AC) | 100 kA |
| Breaking capacity at 400 V (AC) | 20 kA |
| Breaking capacity at 500 V (AC) | 6 kA |
| Breaking capacity at 690 V (AC) | 3 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 ... +40 °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 |
Depth of 97 mm means it projects about the same as a typical contactor, so the gland plate clearance is the same for the whole starter row.
The auxiliary contact ratings are worth noting for the control circuit: 1 A at 24 V, 0.5 A at 120/125/230 V, and only 0.15 A at 60 V. That last figure catches people out if they're switching a 60 VDC PLC input — the contact is rated for it, but the current limit is tight.
The breaking capacity is 10 kA at 400 V, which is the rating that governs panel SCCR coordination for standard industrial motor circuits.
Yes, phase failure detection is built in. If one phase drops, the breaker trips on the resulting single-phase current to protect the motor.
The 3RV2021-4FA15 is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at the time of quote.
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