Covering motor currents of 9 … 12.5 A, the Siemens 3RV2021-1KA10 is a 3-pole SIRIUS 3RV2 motor protection circuit breaker, size S0, CLASS 10, with an instantaneous short-circuit release of 163 A. Per Siemens it suits motors of about 5.5 kW at 400 V and has a rated short-circuit breaking capacity (Icu) of 100 kA at 400 V.
Unlike fuses, a 3RV2 can be reset after a trip, and its rotary handle clearly shows ON, OFF or TRIPPED, which speeds up fault finding on the shop floor.
See more Siemens industrial controls, including SIRIUS 3RT2 contactors of the same size.
Technical data
| Siemens order number | 3RV2021-1KA10 |
|---|---|
| Product | SIRIUS 3RV2 circuit breaker for motor protection |
| Size | S0 |
| Overload release setting range | 9 … 12.5 A |
| Instantaneous short-circuit release | 163 A |
| Trip class | CLASS 10 |
| Rated current | 12.5 A |
| Motor power AC-3 at 400 V | 5.5 kW |
| Motor power AC-3 at 230 V | 3 kW |
| Motor power, 3-phase 460/480 V (UL) | 8 hp |
| Breaking capacity Icu at 400 V | 100 kA |
| Breaking capacity Ics at 400 V | 100 kA |
| Rated operating voltage | 690 V |
| Phase failure sensitivity | Yes |
| Isolating function | Yes |
| Combinable contactor sizes | S00, S0 |
| Power loss (hot, total) | 9.25 W |
| Degree of protection (front) | IP20 |
| Ambient temperature (operation) | -20 … +60 °C |
| Mounting | screw and snap-on mounting onto 35 mm DIN rail according to DIN EN 60715 |
| Dimensions (W x H x D) | 45 x 97 x 97 mm |
| Net weight | 0.33 kg |
| Condition | New, original Siemens |
Typical applications
- Motor branch circuits with full-load currents between 9 … 12.5 A
- Protection of pumps, fans, conveyors and compressors
- Machine-builder panels where a lockable rotary isolator is required
- Transformer and control circuit protection where a motor-type characteristic is acceptable
Compatibility and replacement
Auxiliary switches for status feedback can be added on the front (transverse, for example 3RV2901-1E) or on the left side (3RV2901-1A). Choose the setting range so that the motor full-load current sits roughly in the middle of the dial; this leaves room for adjustment.
Frequently asked questions
At what current does it trip instantly?
The magnetic (N) release responds at 163 A, per Siemens.
Does it include auxiliary contacts?
No. This version has no auxiliary contacts installed; add a 3RV2901 auxiliary switch if you need feedback to the PLC.
What motor current can it protect?
The overload release is adjustable from 9 … 12.5 A. Set it to the rated current shown on the motor nameplate.
Do you ship to my country, and what is the warranty?
Yes. RendatSP ships worldwide from Yiwu, China, by air in 5 to 7 days once the part is ready, and every part carries a 1-year warranty. Send the order number and quantity on WhatsApp and we will reply with a quotation.
How to order
Message us the order number and quantity. For breakdowns, tell us the delivery address and we will offer the fastest shipping option. If the exact part is discontinued, we confirm the official successor before quoting.
Every part RendatSP supplies is new and original, carries a 1-year warranty and ships worldwide by air in 5 to 7 days once ready (shipping, payment and warranty). Send us the order number and quantity on WhatsApp or through the inquiry form and we will quote the same working day. Agents in Saudi Arabia, Iraq, the UAE, Egypt, Oman, Libya, Morocco, Mauritania, Yemen, Algeria and Jordan.
