Motor protection relay, 11-16 A, screws down to the contactor
The Siemens 3RU6126-4AB0 is a SIRIUS thermal overload relay with an adjustable current response value of 11 to 16 A, sized for motor protection in a standard 3-phase circuit up to 690 V at 50-60 Hz. Trip Class 10 means it trips fast enough to protect a motor during a stalled-rotor condition without nuisance-tripping on a normal start — the sweet spot for most general-purpose induction motors driving pumps, fans, and conveyors. This relay mounts directly onto a S0-size contactor — no separate DIN-rail footprint to budget for in the panel layout. The 45 mm width and 85 mm depth match the contactor's envelope, so the assembly wires up clean as a single unit.
Screw terminals, Class 10 thermal curve, and what the ratings actually mean for the panel
Auxiliary circuit terminals take 2x (20-16 AWG) or 2x (18-14 AWG). That's a standard screw-clamp that holds firm under thermal cycling — no spring clips to fight. The thermal overload release is ambient-compensated from -40 to +70 °C during operation, with a relative humidity ceiling of 90 %. Power loss runs 6.1 W typical at rated current, climbing to 8.1 W in hot operating state at AC. At 2.7 W per pole, the heat stays manageable inside a grouped starter column — no forced cooling required for most builds. That covers the transient environment of a 480 V industrial panel without external suppression.
Current production — sourced per RFQ through independent distribution
This relay is sourced to order against your BOM quantity through independent distribution channels. Submit an RFQ for the exact quantity and delivery window your line needs.