The 3RB1246-1QB11: The 6.3...25 A setting range covers IEC frame sizes from about 1.5 kW to 11 kW at 400 V (four-pole induction motor). The class 5...30 adjustment lets you tune the trip delay: class 5 for short-stall submersible pumps, class 10 for standard conveyors, class 20 or 30 for high-inertia loads like centrifuges. Screw terminals on the auxiliary circuit match standard panel wiring practice; the main circuit uses through-hole transformer sensing, so no power wiring passes through the relay body.
Siemens 3RB1246-1QB11 Overload Relay, 6.3-25 A, Discontinued
MPN3RB1246-1QB11
Siemens SIRIUS 3RB1246-1QB11 overload relay, 6.3...25 A, for full motor protection, size S00/S0, class 5...30, individual mount, screw terminals, DC 24 V control supply.
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026
Product details
Frequently asked questions
What does the 6.3...25 A range cover in motor size?
At 400 V three-phase, the 6.3...25 A setting range covers motors from roughly 1.5 kW to 11 kW (four-pole induction). The class 5...30 trip curve adjustment lets you match it to the specific load type — short-stall pumps through high-inertia centrifuges.
MPN
3RB1246-1QB11