Siemens SIRIUS motor protection circuit breaker, 3RV2042-4JA10, CLASS 10, screw terminals, 50 kA breaking capacity at 400 V AC, DIN rail mount.
| Parameter | Value |
|---|---|
| Series | SIRIUS |
| Product designation | Circuit breaker |
| Frame size | S3 |
| Parameter | Value |
|---|---|
| Rated operational current (Ie) | 63 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 | 1 000 V |
| Rated impulse withstand voltage (Uimp) | 8 kV |
| Number of poles | 3 |
| Power loss (AC, hot) | 34 W |
| Power loss, per pole (AC, hot) | 11.3 W |
| Parameter | Value |
|---|---|
| Overload release setting range | 45 ... 63 A |
| Instantaneous short-circuit trip current | 819 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) | 15 kA |
| Breaking capacity at 690 V (AC) | 7.5 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.) | 25 000 |
| Endurance, auxiliary contacts (typ.) | 25 000 |
| Switching frequency, AC-3 (max.) | 15 1/h |
| Parameter | Value |
|---|---|
| Main-circuit terminal type | screw-type terminals |
| Main-circuit connector arrangement | Top and bottom |
| Conductor cross-section, solid / stranded | 2x (2,5 ... 50 mm²), 1x (10 ... 70 mm²) |
| Conductor cross-section, finely stranded with ferrule | 2x (2.5 ... 35 mm²), 1x (2.5 ... 50 mm²) |
| Parameter | Value |
|---|---|
| Height | 165 mm |
| Width | 70 mm |
| Depth | 176 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 |
Dimensions are 70 mm wide, 165 mm high, 176 mm deep, with 150 mm clearance required above and below for arc venting, and 30 mm at the sides. Screw-type terminals on the main circuit accept 2x (2.5 to 16 mm²) solid or stranded, or 1x (10 to 70 mm²) for larger feeds — typical for panel wiring up to 63 A continuous.
Rated operational voltage spans 20 to 690 V AC, with a maximum of 15 switching operations per hour at AC-3 duty (motor starting).
Both are SIRIUS motor protection breakers on the same 35 mm DIN rail footprint, but the 3RV2042-4JA10 is a physically larger frame (70 mm wide vs the smaller 3RV2021 frame). Check panel cutout and terminal lug sizes before substituting.
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