SIRIUS solid-state overload relay, S3 frame, 115 A continuous
The 3RB3143-4XB0 is a SIRIUS solid-state overload relay in the S3 size, rated for a thermal current of 115 A at 480 V and 600 V. It mounts directly onto a contactor via the fastening method, saving DIN-rail space in a packed enclosure. Trip class is field-adjustable across CLASS 5E, 10E, 20E and 30E, so you can match the relay's response to the motor start profile — fast trip for short-acceleration loads, slower for high-inertia starts — without swapping hardware.
Panel fit and termination
Footprint is 70 mm wide, 106 mm tall, and 124 mm deep — the S3 frame fits alongside the matching SIRIUS contactor range. The screwdriver spec calls for a PZ2 Pozidriv tip with a 5-6 mm shaft diameter — keep that bit in your panel kit.
Storage and transport limits are -40 to +80 °C. Vibration resistance is 1-6 Hz at 15 mm amplitude and 6-500 Hz at 20 m/s² for 10 cycles; shock resistance is 8g for 11 ms on the signaling contact in tripped position. That passes the typical IEC 60068-2-27 profile for industrial cabinet gear. Power dissipation per pole is 1.53 W — at 115 A continuous, three poles generate about 4.6 W total. That's low enough that you don't need forced cooling in a standard IP54 enclosure, but keep it away from heat-sensitive components on the same DIN rail.
No stock-holding claim — quoted per RFQ.