Siemens SIRIUS circuit breaker, 3RV6421-4AA10, size S0, 3-pole, 16 A, Class 10, for transformer protection, screw terminals, 690 V, 50/60 Hz.
| Parameter | Value |
|---|---|
| Series | SIRIUS |
| Product designation | Circuit breaker |
| Frame size | S0 |
| Parameter | Value |
|---|---|
| Rated operational current (Ie) | 16 A |
| Rated voltage | 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 |
| Parameter | Value |
|---|---|
| Overload release setting range | 10 ... 16 A |
| Instantaneous short-circuit trip current | 286 A |
| Trip class | CLASS 10 |
| Short-circuit trip type | magnetic |
| Overload release type | thermal |
| Short-circuit protection | Yes |
| Parameter | Value |
|---|---|
| Main-circuit terminal type | screw-type terminals |
| Main-circuit connector arrangement | Top and bottom |
| Conductor cross-section, solid / stranded | 2x (1 ... 2.5 mm²), 2x (2.5 ... 10 mm²) |
| Conductor cross-section, finely stranded with ferrule | 2x (1 ... 2.5 mm²), 2x (2.5 ... 6 mm²), 1x 10 mm² |
| Parameter | Value |
|---|---|
| Height | 97 mm |
| Width | 45 mm |
| Depth | 96 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 |
| Transport temperature | -50 ... +80 °C |
| Relative humidity (operation) | 10 ... 95 % |
| Max. installation altitude | 2 000 m |
| Parameter | Value |
|---|---|
| Design Of The Product | for transformer protection |
It carries a 16 A rated operational current and a Class 10 trip characteristic, meaning it allows the inrush of a transformer while still tripping fast enough on a hard fault.
Screw-type terminals on top and bottom accept up to 10 mm² solid or 6 mm² finely stranded with ferrules, or 2x 10 mm² solid. Torque to 2–2.5 N·m. Depth is 96 mm, width 45 mm, height 97 mm — fits standard panel layouts.
This part is sourced and quoted to order against an RFQ through independent distribution. Submit an RFQ for current pricing and availability.
RoHS compliance date is 05/01/2012. The breaker is designed for IEC 60947 applications and carries the SIRIUS brand.
Both are S0-size breakers on 35 mm DIN rail with screw terminals, so the mechanical footprint and wiring method are the same. However, the 3RV6421-4AA10 is a transformer-protection variant (Class 10, 16 A), while the 3RV6021-4DA10 is a motor-protective breaker — verify the trip curve and current rating match your load before swapping.
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