The Siemens 3RH1921-1DA11-0KR0-ZX90 is a side-mounted auxiliary switch block for motor contactors in the S0 through S12 frame sizes. It provides one normally-open and one normally-closed contact, wired via screw terminals on a 10 mm pitch per EN 50012. This is a special-purpose device, and the manufacturer has designated it as a phased-out product.
Lifecycle and Replacement
The lifecycle stage for this order code is listed as current, but the description explicitly states it is a phased-out product. The official successor is the SIRIUS 3RH2 series. For a BOM freeze or a line-down replacement, the 3RH2 is the drop-in path to quote against.
Sourcing
As a phased-out special-purpose device, the 3RH1921-1DA11-0KR0-ZX90 is sourced through independent distribution channels. Availability and current pricing are confirmed at quote time against an RFQ. For new designs or long-term BOM stability, the SIRIUS 3RH2 successor is the recommended specification.