Siemens 3RV29281A N Motor Protection Relay

Siemens 3RV29281A is a disconnecting module (Trennerbaustein) for Siemens SIRIUS 3RV2 motor protection devices, sized for S00/S0 circuit-breaker frames. This accessory provides a clearly visible isolation point in motor control circuits and is designed to mount with 3RV2 protection equipment to enable safe maintenance lockout on low-voltage motor installations. Cataloged as a 3RV2928-1A family member, it aligns with the SIRIUS line’s protection and isolation features for S00/S0 frame sizes. It functions as a dedicated sectioning component within the 3RV2 system, delivering a physical separation path when the associated circuit breaker is opened, rather than acting as an independent protection relay. Typical applications include industrial motor circuits where defined isolation points are required for servicing, testing, or safety procedures, especially in compact control panels that rely on S00/S0-sized circuit breakers. The module supports standard accessory use within the 3RV2 family and complements the field-installable protection scheme by providing a local, visible break in the circuit to meet maintenance and safety requirements.