What it is and what it does
The Siemens SIRIUS 3RT1946-4GA07-ZW97 is a terminal block designed as Type E per UL 508, sized S3 for use with a circuit breaker. It provides increased clearances and creepage distances for combination motor controllers, making it a fit for UL-listed panels where Type E coordination is specified.
Integration and mounting
The terminal block mounts on a 35 mm DIN rail per DIN EN 50022, consistent with standard SIRIUS contactor footprints. It is designed for multi-unit packaging of 24 units, so a panel build requiring several blocks should account for the packaging quantity. The Type E designation means it meets UL 508 spacing and creepage requirements for combination motor controllers — critical for UL 508A panel shops.