The Siemens 3RV1923-1CA00-0FJ0 is an IP55 insulated combination housing for a 3RV motor starter protector or 3RT contactor assembly. It includes N and PE terminals, locks in the O-position (off), measures 54 mm wide, and comes with a metric cable gland from Benedikt & Jaeger.
What the IP55 rating means for installation
IP55 means the housing is dust-protected and protected against water jets from any direction. That suits it for washdown areas, outdoor cabinets, or dusty production floors — the kind of environment where a standard open starter would need a separate enclosure. The 54 mm width matches the standard 3RV/3RT footprint, so it clips onto the same DIN rail as the breaker and contactor without requiring extra panel space.
For a BOM-line commitment, the key fit check is the 54 mm width and the metric cable gland size — confirm the gland matches your incoming cable diameter before specifying.