The Siemens 3RW4743-0NC00 is a power semiconductor module designed as a service part for the 3RW4443 soft starter family. It carries an NTC thermistor for thermal monitoring and is rated 690 V at 203 A. This is not a standalone soft starter — it is the internal thyristor/SCR module that handles the motor start current. When a 3RW4443 unit fails on the power stage, this is the swap-in replacement that avoids scrapping the whole unit.
Siemens 3RW4743-0NC00 Power Semiconductor Module, 690 V
MPN3RW4743-0NC00
Siemens 3RW4743-0NC00 power semiconductor module, NTC, 690 V, 203 A, for 3RW4443 soft starters.
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026
Specifications
| Parameter | Value |
|---|---|
| Product designation | Power semiconductor module |
| Parameter | Value |
|---|---|
| Substance prohibitance | 05/01/2012 |
Product details
Frequently asked questions
Where can I buy 3RW4743-0NC00 and get a price?
The 3RW4743-0NC00 is available to order through independent distribution.
What is the 3RW4743-0NC00 used for?
It is a power semiconductor module (thyristor/SCR stage) with an integrated NTC thermistor, rated 690 V and 203 A, used as a service replacement for the Siemens 3RW4443 soft starter family.
MPN
3RW4743-0NC00