Siemens · Variable Frequency Drives
SIRIUS 3RW52 Soft Starter 7.5 kW
Part number 3RW5213-1AC04
Soft starter with torque control and pump stop, 7.5 kW / 18 A at 400 V, internal bypass, 24 V DC control.
- CE
- UL
- cULus
- RoHS
Overview
Where a motor only needs to start and stop gently — pumps, fans, conveyors at fixed speed — a soft starter is cheaper and simpler than a VFD. The SIRIUS 3RW52 adds torque control and a pump-stop function that avoids water hammer, has internal bypass contacts to eliminate heat during run, and reports diagnostics via a communication module if required. The 3RW5213-1AC04 is rated 18 A (7.5 kW at 400 V) with 24 V DC control voltage.
Key features
- Torque control for smooth start and stop; pump-stop function
- Internal bypass — no external bypass contactor needed
- Adjustable current limit and motor overload protection
- Optional PROFINET / PROFIBUS / Modbus communication module and HMI
- Width 55 mm, DIN-rail or screw mounting
Typical applications
- Pump start/stop without water hammer
- Fan control
- Conveyor soft start
- Compressor starting
Technical specifications — 3RW5213-1AC04
| Power | |
|---|---|
| Rated power at 400 V | 7.5 kW |
| Rated current | 18 A |
| Main circuit voltage | 200–480 V AC |
| Control voltage | 24 V AC/DC |
| Control | |
| Functions | Torque control, voltage ramp, current limit, pump stop |
| Protection | Electronic motor overload, thermistor input |
| Environment | |
| Operating temperature | -25…+60 °C (derating above 40 °C) |
| Width | 55 mm |
Specifications are summarised from the manufacturer's documentation for selection purposes. Always confirm against the current datasheet before design-in; we send the datasheet and the exact ordering code with every quotation.
Related part numbers and alternatives
| Part number | Relationship | |
|---|---|---|
3RW5213-1AC14 | Same rating with 110–250 V AC/DC control voltage | Quote |
3RW5214-1AC04 | 25 A / 11 kW — next size | Quote |
3RW4026-1BB04 | 3RW40 — previous generation, basic soft starter | Quote |
Not sure which variant you need? Send us the nameplate photo or the old part number and we will identify the current equivalent.
Supply, documentation and lead time
What you receive
- Genuine Siemens product in original packaging
- Commercial invoice and packing list; Certificate of Conformance on request
- Datasheet, declaration of conformity and country of origin as issued by the manufacturer
- Manufacturer warranty, period stated on the quotation
How we quote
- Reply within one business day with price, lead time and stock position
- Alternatives proposed when they improve price or delivery
- Incoterms of your choice: EXW Hai Phong, FOB/FCA, CIF/DAP to your site
- Consolidated shipments for multi-line orders; export documentation for buyers outside Vietnam
Indicative HS code 8537.10 — final classification is confirmed on the commercial invoice.
Frequently asked questions
Is the 3RW5213-1AC04 available from stock, and what is the lead time?
Availability of the SIRIUS 3RW52 Soft Starter 7.5 kW changes with manufacturer production and distributor stock, so we confirm it per request rather than publishing a number that may be out of date. Send the part number and quantity through the quote form and you will receive stock position and lead time within one business day.
Is the 3RW5213-1AC04 genuine, and what documentation comes with it?
We supply only genuine Siemens products sourced from the manufacturer or authorized distribution channels. Each delivery includes the commercial invoice and packing list; a Certificate of Conformance, declaration of conformity and country-of-origin statement are provided on request, and the manufacturer's warranty applies.
Can you ship the 3RW5213-1AC04 outside Vietnam?
Yes. We quote EXW Hai Phong, FCA/FOB, CIF or DAP and prepare the export documentation. Buyers in Japan, ASEAN, Europe and North America regularly consolidate multi-brand orders with us into one shipment.
What if the 3RW5213-1AC04 is the wrong variant for my application?
Tell us the application in the notes field. Our engineers check the ordering code against your supply voltage, I/O, communication and environmental requirements and propose the correct variant or a successor part before quoting — at no charge.