At 45 mm wide and 97 mm deep, it fits standard motor-starter slots without crowding the gland plate. Main circuit connections use spring-loaded terminals that accept 2x (0.5 to 2.5 mm²) solid or stranded wire — no screw torque to verify, just strip and push. Clearance distances: 50 mm above and below, 30 mm to the side, zero front and back. That keeps the arc-quenching zone clear and the heat path open.
Siemens 3RV2021-4AA25-ZW96 SIRIUS Motor Protection Circuit B
MPN3RV2021-4AA25-ZW96
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Siemens SIRIUS 3RV2021-4AA25-ZW96 motor protection circuit breaker, Class 10 trip, 100 kA breaking capacity at 240 V, 45 mm wide, spring-loaded terminals.
Source DocumentedChannel stated on listing & quote
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Independent China distributor & sourcing agent· Listing updated Sep 2026
Specifications
| Parameter | Value |
|---|---|
| Series | SIRIUS |
| Product designation | Circuit breaker |
| Frame size | S0 |
| Parameter | Value |
|---|---|
| Rated operational current (Ie) | 16 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) | 9.25 W |
| Power loss, per pole (AC, hot) | 3.1 W |
| Parameter | Value |
|---|---|
| Overload release setting range | 10 ... 16 A |
| Instantaneous short-circuit trip current | 208 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 | spring-loaded terminals |
| Main-circuit connector arrangement | Top and bottom |
| Conductor cross-section, solid / stranded | 2x (0.5 ... 2.5 mm²) |
| Conductor cross-section, finely stranded with ferrule | 2x (0.5 ... 1.5 mm²) |
| Parameter | Value |
|---|---|
| Height | 119 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 |
Product details
Frequently asked questions
What is the closest functional second-source for 3RV2021-4AA25-ZW96?
The 3RV2021-4CA25 is a direct sibling in the same SIRIUS 3RV2 family — same Class 10 trip, same 45 mm width, same spring-loaded terminal design. The difference is in the auxiliary contact configuration (the -4CA25 carries a different contact block), so verify the auxiliary wiring before swapping.
Will 3RV2021-4AA25-ZW96 drop into a panel specified around 3RV2021-4CA25?
Yes, the mechanical footprint is identical — same 45 mm width, same DIN rail mount, same terminal type. The swap is a straight mechanical fit; the only check is whether the auxiliary contact arrangement on the -4CA25 matches what your circuit expects.
MPN
3RV2021-4AA25-ZW96