Siemens SIRIUS motor protection circuit breaker, 3RV2021-1AA20-ZX95, S0 frame, Class 10, 100 kA breaking capacity at 400 V AC, screw and snap-on 35 mm DIN rail mount.
| Parameter | Value |
|---|---|
| Series | SIRIUS |
| Product designation | Circuit breaker |
| Frame size | S0 |
| Parameter | Value |
|---|---|
| Rated operational current (Ie) | 1.6 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) | 7.25 W |
| Power loss, per pole (AC, hot) | 2.4 W |
| Parameter | Value |
|---|---|
| Overload release setting range | 1.1 ... 1.6 A |
| Instantaneous short-circuit trip current | 21 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) | 100 kA |
| Breaking capacity at 690 V (AC) | 100 kA |
| Breaking capacity at 240 V | 100 kA |
| Breaking capacity at 690 V | 100 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 | 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) |
| Conductor range, AWG (main contacts) | 2x (18 ... 8) |
| Parameter | Value |
|---|---|
| Height | 119 mm |
| Width | 45 mm |
| Depth | 97 mm |
| Mounting method | screw and snap-on mounting onto 35 mm standard mounting 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 trips on overload within Class 10 time limits — that means it clears a stalled-rotor condition fast enough to keep the motor winding insulation intact on most standard induction motors up to about 1 hp at 460/480 V.
The S0 frame footprint is 45 mm wide, 119 mm tall, 97 mm deep — that 97 mm depth is the dimension you need to clear the gland plate or backpanel. The screwdriver shaft spec is 3 mm diameter, which matches most standard terminal screwdrivers on a panel bench.
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The depth is 97 mm, measured from the mounting rail face to the furthest projecting point of the breaker body.
The width is 45 mm, which is the S0 frame standard — it occupies one 45 mm slot on a DIN rail.
Both are S0 frame breakers with the same 45 mm width and 35 mm DIN rail mount, so the mechanical fit is identical. Terminal type and ratings differ — verify the main circuit connections and the trip curve match your load before swapping.
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