Set the dial of the Siemens 3RV2021-1HA10 anywhere between 5.5 … 8 A: this size S0 SIRIUS 3RV2 circuit breaker protects the motor against overload (CLASS 10) and trips instantly at 104 A on a short circuit. Per Siemens it suits motors of about 3 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 | 3RV2021-1HA10 |
|---|---|
| Product | SIRIUS 3RV2 circuit breaker for motor protection |
| Size | S0 |
| Overload release setting range | 5.5 … 8 A |
| Instantaneous short-circuit release | 104 A |
| Trip class | CLASS 10 |
| Rated current | 8 A |
| Motor power AC-3 at 400 V | 3 kW |
| Motor power AC-3 at 230 V | 1.5 kW |
| Motor power, 3-phase 460/480 V (UL) | 5 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 | 0.332 kg |
| Condition | New, original Siemens |
Typical applications
- Machine-builder panels where a lockable rotary isolator is required
- Replacement of a tripped or damaged 3RV2 breaker
- Motor branch circuits with full-load currents between 5.5 … 8 A
- Fuseless motor starters with SIRIUS 3RT2 contactors
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). For a complete starter combine it with a size S0 3RT2 contactor using the matching Siemens link module.
Frequently asked questions
What is the short-circuit breaking capacity?
Per Siemens: Icu 100 kA at 400 V, Ics 100 kA.
Can it replace a fuse and overload relay?
Yes. A motor starter protector provides both short-circuit and overload protection, so in a typical starter it replaces the fuses and the separate overload relay.
Which contactors can it be combined with?
Per Siemens: contactor sizes S00, S0.
Can I get a price and delivery time?
Prices are quoted on request. Send the order number, quantity and delivery country on WhatsApp and we will reply with price and delivery time; air shipping is usually 5 to 7 days once ready, with a 1-year warranty.
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.
RendatSP ships from Yiwu, China, to factories worldwide; air delivery usually takes 5 to 7 days once the part is ready. The part is new and original with a 1-year warranty (shipping, payment and warranty). For a quotation, message us on WhatsApp with the order number and quantity. We also have agents in Saudi Arabia, Iraq, the UAE, Egypt, Oman, Libya, Morocco, Mauritania, Yemen, Algeria and Jordan.
