The Siemens 3RV2031-4KA10 is a SIRIUS 3RV2 motor starter protector (circuit breaker for motor protection) in size S2, with a thermal overload release adjustable from 62 … 73 A and a magnetic short-circuit release at 949 A. Per Siemens it suits motors of about 37 kW at 400 V and has a rated short-circuit breaking capacity (Icu) of 65 kA at 400 V.
Siemens describes this unit as: Circuit breaker size S2 for motor protection, CLASS 10 A-release 62…73 A N- release 949 A screw terminal Standard switching capacity. Its instantaneous release at 949 A is set well above the motor starting current, so normal starts do not trip it.
See more Siemens industrial controls, including SIRIUS 3RT2 contactors of the same size.
Technical data
| Siemens order number | 3RV2031-4KA10 |
|---|---|
| Product | SIRIUS 3RV2 circuit breaker for motor protection |
| Size | S2 |
| Overload release setting range | 62 … 73 A |
| Instantaneous short-circuit release | 949 A |
| Trip class | CLASS 10 |
| Rated current | 73 A |
| Motor power AC-3 at 400 V | 37 kW |
| Motor power AC-3 at 230 V | 22 kW |
| Motor power, 3-phase 460/480 V (UL) | 50 hp |
| Breaking capacity Icu at 400 V | 65 kA |
| Breaking capacity Ics at 400 V | 30 kA |
| Rated operating voltage | 690 V |
| Phase failure sensitivity | Yes |
| Isolating function | Yes |
| Combinable contactor sizes | S2 |
| Power loss (hot, total) | 29.5 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) | 55 x 140 x 149 mm |
| Net weight | 1.166 kg |
| Condition | New, original Siemens |
Typical applications
- Replacement of a tripped or damaged 3RV2 breaker
- Fuseless motor starters with SIRIUS 3RT2 contactors
- Transformer and control circuit protection where a motor-type characteristic is acceptable
- Machine-builder panels where a lockable rotary isolator is required
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). The older 3RV10 series has been replaced by the 3RV20; send us the old order number and we will confirm the matching setting range.
Frequently asked questions
What is the short-circuit breaking capacity?
Per Siemens: Icu 65 kA at 400 V, Ics 30 kA.
What motor current can it protect?
The overload release is adjustable from 62 … 73 A. Set it to the rated current shown on the motor nameplate.
At what current does it trip instantly?
The magnetic (N) release responds at 949 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.
Need it fast? Send the order number, quantity and delivery country on WhatsApp or through the inquiry form and we reply with a quotation the same working day. All parts are new and original, covered by a 1-year warranty, and ship worldwide by air in 5 to 7 days once ready (shipping, payment and warranty). Local agents: Saudi Arabia, Iraq, the UAE, Egypt, Oman, Libya, Morocco, Mauritania, Yemen, Algeria and Jordan.
