The 3RW4776-0NB00 is the power semiconductor module with an integrated NTC thermistor, designed as a service replacement for the Siemens 3RW4076 soft starter series. It carries a 432 A rating at 600 V — that's the continuous current the semiconductor stack handles, not the motor full-load current the starter controls. The NTC thermistor monitors the module temperature and feeds back to the starter's protection logic; if the junction temperature climbs toward the limit, the starter reduces the ramp current or trips before the silicon sees thermal damage. This is a subassembly, not a standalone soft starter. You bolt it onto the 3RW4076 power unit when the original semiconductor stack fails or when you're rebuilding a starter that's been in service long enough to accumulate thermal cycles. The 432 A figure tells you the module matches the 3RW4076's full rating — no derating needed for the replacement part itself.
Sourcing this replacement module
If the 3RW4776-0NB00 is the module called out in the starter's parts list, that's the one to order — the NTC characteristic and the mounting interface are specific to the 3RW4076 power unit.