What is 3RW2920-4AD00 used for?
The Siemens 3RW2920-4AD00 is an RC circuit designed as a replacement or spare part for the 3RW2238-0DB1 through 3RW2250-0DB1 soft starters. It suppresses voltage spikes and transients across the starter's internal contacts, protecting the control circuitry from inductive kickback during motor start and stop cycles. This is a field-replaceable module, not a standalone device — you swap it into the soft starter housing when the original snubber fails or as a preventive maintenance item.
Compatibility and fit
The 3RW2920-4AD00 is listed for the 3RW2238-0DB1 through 3RW2250-0DB1 soft starters. It matches the mechanical mounting and electrical termination of those specific frames. For starters outside that range, the mounting bracket and terminal spacing will not align.