Covering motor currents of 30 … 36 A, the Siemens 3RV2021-4PA10 is a 3-pole SIRIUS 3RV2 motor protection circuit breaker, size S0, CLASS 10, with an instantaneous short-circuit release of 432 A. Per Siemens it suits motors of about 18.5 kW at 400 V and has a rated short-circuit breaking capacity (Icu) of 20 kA at 400 V.
Set the overload dial to the full-load current on the motor rating plate. If the breaker trips repeatedly, check the motor, the mechanical load and the supply phases before raising the setting.
See more Siemens industrial controls, including SIRIUS 3RT2 contactors of the same size.
Technical data
| Siemens order number | 3RV2021-4PA10 |
|---|---|
| Product | SIRIUS 3RV2 circuit breaker for motor protection |
| Size | S0 |
| Overload release setting range | 30 … 36 A |
| Instantaneous short-circuit release | 432 A |
| Trip class | CLASS 10 |
| Rated current | 36 A |
| Motor power AC-3 at 400 V | 18.5 kW |
| Motor power AC-3 at 230 V | 7.5 kW |
| Motor power, 3-phase 460/480 V (UL) | 25 hp |
| Breaking capacity Icu at 400 V | 20 kA |
| Breaking capacity Ics at 400 V | 10 kA |
| Rated operating voltage | 690 V |
| Phase failure sensitivity | Yes |
| Isolating function | Yes |
| Combinable contactor sizes | S00, S0 |
| Power loss (hot, total) | 16.25 W |
| Degree of protection (front) | IP20 |
| Ambient temperature (operation) | -20 … +40 °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 | 0.357 kg |
| Condition | New, original Siemens |
Typical applications
- Fuseless motor starters with SIRIUS 3RT2 contactors
- Motor branch circuits with full-load currents between 30 … 36 A
- Machine-builder panels where a lockable rotary isolator is required
- Protection of pumps, fans, conveyors and compressors
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
Can it be locked off?
Yes, the rotary handle can be locked in the OFF position with a padlock, which is required for safe maintenance in many plants.
Which contactors can it be combined with?
Per Siemens: contactor sizes S00, S0.
At what current does it trip instantly?
The magnetic (N) release responds at 432 A, per Siemens.
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.
