Siemens 3RW4037-1BB14 (SIRIUS 3RW soft starters): SIRIUS soft starter S2 63 A, 30 kW/400 V, 40 °C 200-480 V AC, 110-230 V AC/DC Screw terminals.
A soft starter reduces water hammer in pump lines and belt slip on conveyors; after the ramp an internal bypass carries the running current, so the unit stays compact and cool.
See our Siemens range.
Technical data
| Siemens order number | 3RW4037-1BB14 |
|---|---|
| Ambient temperature (operation) | -25 … +60 °C |
| Dimensions (W x H x D) | 55 x 160 x 170 mm |
| Condition | New, original Siemens |
Features at a glance
- SIRIUS soft starter S2 63 A
- 30 kW/400 V
- 40 °C 200-480 V AC
- 110-230 V AC/DC Screw terminals
Typical applications
- Replacing a failed soft starter
- Conveyor belts
- Pumps and fans
- Replacing a star-delta starter
- Compressors
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 3RW4037-1BB14 with the label on the old unit, including the last digits (they identify the version).
Frequently asked questions
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.
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.
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.
Is it new and original?
Yes. We supply new, original parts in the manufacturer packaging, with a 1-year warranty.
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.
Ordering tips
Send us the full order number from the label of the old part, or a clear photo of the label, together with the quantity you need. We check the number against the current manufacturer data before we quote and tell you if there is a newer replacement.
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.
