Motor protection relay for S0 contactors
The 3RU6126-1EB0: Total typical power dissipation is 5.4 W, with 1.9 W per pole at the rated current — a figure to budget for when packing relays side-by-side in a panel, especially given the 6 mm required spacing to grounded parts.
Class 10 trip and the 2.8–4 A window
The adjustable current response value of 2.8…4 A covers the lower end of the S0 frame's range — common for fractional-horsepower motors, small conveyors, or pump drives drawing around 3–4 A full-load. The Class 10 trip class matches IEC 60947-4-1 and ensures the relay opens before the motor winding insulation degrades during a stall. Surge voltage resistance is 6 kV and insulation voltage at pollution degree 3 is 690 V, so the relay can sit in a 480 V panel with adequate clearance to grounded metalwork. Shock resistance per IEC 60068-2-27 is 8 g for 11 ms — sufficient for most industrial machinery but worth noting if the relay is mounted on a contactor that sees frequent high-impact switching.
Mounting and environmental envelope
Fastening is by direct contactor mounting — the relay snaps onto the S0 contactor without additional DIN-rail hardware, keeping the assembly compact at 45 mm wide × 85 mm deep × 85 mm high. Installation altitude is limited to 2,000 m above sea level without derating — above that, the dielectric strength of air gaps decreases and the relay's insulation coordination may need review.
RoHS compliance date is May 1, 2012, covering the EU directive's substance restrictions. The relay carries no UL or CSA mark in the on-record data, so verify local code acceptance if the panel requires third-party certification for the overload relay itself.