Active production — no obsolescence signal
The 3RW4745-0NC00: This is a power semiconductor module rated for 313 A at 690 V, designed as a replacement NTC assembly for the 3RW4444 and 3RW4445 soft starter frames.
What it fits and what it does
The 3RW4745-0NC00 is the NTC thermistor module that mounts inside the 3RW4444 or 3RW4445 soft starter — it monitors the thyristor heatsink temperature and feeds the signal back to the control board for overtemperature protection. Rated at 690 V and 313 A, it matches the full-load current of the host soft starter; if you are servicing a 3RW4444 or 3RW4445 unit and the NTC module has failed, this is the direct Siemens replacement part.