Order number 3RW4038-1BB14 is a genuine Siemens part from the SIRIUS 3RW soft starters range. Official description: SIRIUS soft starter S2 72 A, 37 kW/400 V, 40 °C 200-480 V AC, 110-230 V AC/DC Screw terminals.
SIRIUS 3RW soft starters ramp the motor voltage up and down so that pumps, fans, compressors and conveyors start without the current peak and mechanical shock of a direct-on-line start.
See our Siemens range.
Technical data
| Siemens order number | 3RW4038-1BB14 |
|---|---|
| Ambient temperature (operation) | -25 … +60 °C |
| Dimensions (W x H x D) | 55 x 160 x 170 mm |
| Condition | New, original Siemens |
Main features
- SIRIUS soft starter S2 72 A
- 37 kW/400 V
- 40 °C 200-480 V AC
- 110-230 V AC/DC Screw terminals
Typical applications
- Pumps and fans
- Conveyor belts
- Compressors
- Replacing a star-delta starter
- Replacing a failed soft starter
Compatibility and replacement
Compare the rated current, motor power, control supply voltage and connection type (screw or spring-loaded) with the old soft starter; the Siemens data sheet above gives the exact values.
What to check first
- Check the mounting (DIN rail or screw fixing) and the terminal type (screw or spring-loaded) of the old unit.
- Check the supply voltage and wiring of the old unit before installing the new one.
- Compare the full order number 3RW4038-1BB14 with the label on the old unit, including the last digits (they identify the version).
Frequently asked questions
Can it reduce the starting current?
Yes. Soft starters limit the inrush current by ramping the voltage; the achievable reduction depends on the load and the settings.
Does it need an overload relay?
That depends on the model: check the protective functions listed in the Siemens data sheet, and add a 3RU2 overload relay or 3RV2 breaker where motor protection is not integrated.
Do you supply larger quantities for projects?
Yes. For panel builders and plant projects we quote complete lists; send the bill of materials on WhatsApp or through the inquiry form.
Can you help me identify the right replacement?
Yes. Send us a photo of the label of the old part, or its full order number, and we will confirm the exact match or the official successor before quoting.
How fast can you deliver, and is there a warranty?
Air shipping usually takes 5 to 7 days once the part is ready, to almost any country. Each part is new and original with a 1-year warranty. Message us on WhatsApp with the order number for a quotation.
Before you order
Compare the complete order number on the old unit with this page, including the suffix: in most ranges the last characters set the coil voltage, current range or version. If the label is worn, send us a photo and we will identify the part.
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.
