The 3RB1246-1PB40: The 1.25 to 6.3 A current range matches small to medium induction motors in S00/S0 contactor frames — typical for pumps, fans, and conveyors up to about 3 kW at 400 V. The adjustable class 5 to 30 lets you match the thermal memory to the motor's start profile: class 5 for fast-starting loads like centrifugal pumps, class 10 for general-purpose, class 20 or 30 for high-inertia loads like crushers or long-start conveyors. The DC 24 V control supply is standard for modern PLC-driven panels; the analog output provides a 0/4-20 mA signal proportional to the motor current, useful for remote monitoring or trending without adding a separate transducer.
Panel integration
The relay mounts individually on DIN rail (snap-on) or can be screwed directly to a mounting plate. Straight-through main circuit wiring keeps the power path clean — no looping back through the contactor. Screw terminals on the auxiliary circuit accept 0.5–2.5 mm² stranded or solid wire. The manual-automatic-remote reset selector lets the panel designer choose local hand reset, automatic reset after a fault clears, or remote reset via a PLC digital output.