Control unit for 3RW4056 — what fits where
The Siemens 3RW4756-6SB30 is a control unit designed specifically for the 3RW4056 soft starter in Size S6, with screw terminals for field wiring. It runs on a 115 V control supply, so it's a straight swap into panels already wired for that voltage — no transformer change needed on the control circuit.
Lifecycle and compliance — still in production
RoHS compliance date is 05/01/2012, so it meets the EU substance restrictions that have been in force for over a decade.