Siemens 3RA1943-2A Contactor

Siemens 3RA1943-2A is a wiring kit (electrical and mechanical) designed to accompany reversing starter assemblies for size S3 contactors in the SIRIUS line. This accessory provides the necessary electrical connections and mounting components to configure a reversing starter S3, enabling proper integration with compatible Siemens hardware in motor-control circuits. The part number 3RA1943-2A identifies this specific kit within the Siemens accessory family, and it is intended for use with size S3 contactors as part of a reversing starter configuration. In practice, it serves as an accessory to complete the reversal functionality of the S3 starter assembly rather than as a standalone switching device, making it suitable for industrial applications where bidirectional motor control is required.