Siemens 3RB3046-2XB0 Overload Relay

Siemens Sirius 3RB3046-2XB0 is a solid‑state overload relay for motor protection that mounts with Siemens Sirius contactors in the S3 size. It is rated for 32 to 115 A, delivering inverse‑time protection to motors against overloads, with class 20E thermal characteristics and suitability for contactor mounting on 3RB3 families. The relay uses screw terminals for both the main current path and the auxiliary circuit and supports a Manual‑Automatic‑Reset operating mode for restarting after a trip. As part of the SIRIUS 3RB3 protection family, it provides protection against excessive heating due to overload, phase unbalance, or phase loss for motors in standard drive applications. Key specifications include a 32–115 A current range, approximately 4.6 W power loss at rated current, insulation voltage up to 1000 V, and surge resistance up to 8 kV, enabling reliable operation in industrial environments. Typical applications include motor circuits for conveyors, pumps, and fans where compact, automatic protection is required without additional control logic, and where the relay can be integrated directly with the compatible 3RB3 protection scheme on a pane­lled control system. The unit’s screw terminals on both the main and auxiliary circuits facilitate straightforward wiring, making it a common choice for retrofits or new Sirius motor control installations seeking dependable, plug‑and‑play overload protection.