It mounts directly onto a contactor (contactor mounting), so it integrates into a motor starter assembly on a DIN-rail panel without additional brackets or wiring trays.
It carries ATEX certification (DMT 98 ATEX G 001), so it's approved for use in explosive-gas atmospheres (Zone 1 or 2) when paired with the correct upstream protection and housed in a certified enclosure — a critical detail for chemical, oil-and-gas, or grain-handling lines. The auxiliary contact ratings cover both 24 V DC (1 A) and 120 V AC (3 A) control circuits, so it can signal a PLC input directly at 24 V or drive a 120 V alarm circuit without an interposing relay — saves a part on the BOM. With a depth of 140 mm, width of 70 mm, and height of 120 mm, it's a standard S3 footprint; verify the enclosure depth clearance before panel layout, especially if the contactor behind it adds length.
Wiring and conductor sizing
Main circuit terminals accept solid conductors from 2x (0.5 to 1.5 mm²) up to 2x (0.75 to 2.5 mm²) for auxiliary side, and stranded conductors up to 10 to 70 mm² on power side. Auxiliary contacts use screw-type terminals, same as the main circuit — consistent tooling for the panel builder, no need to switch between spring-cage and screw drivers on the same starter.
No official successor has been announced; the 3RU1146-4EB0 remains the current order code for this S3 thermal overload relay.
Shock-resistant to 8g for 10 ms, so it holds up to the vibration on a compressor skid or a conveyor drive end.