The 3RB1026-1QB1: The 6...25 A adjustment range covers common motor FLA values for small to medium induction motors on 400 V or 480 V systems. Class 10 trip curve means it will trip within 10 seconds at 600% of the set current — fast enough to protect motors with short starting times (most standard pumps, fans, and compressors) but not fast enough for high-inertia loads like centrifuges or crushers that need Class 20 or 30. The size S0 footprint fits standard Siemens SIRIUS mounting rails and shares the same hole pattern as the 3RB20/3RB21 contactor range, so panel layout stays consistent.
Siemens 3RB1026-1QB1 Solid-State Overload Relay, 6-25A, Clas
MPN3RB1026-1QB1
Siemens SIRIUS 3RB1026-1QB1 solid-state overload relay, 6...25 A, Class 10, screw connection, size S0, built-on relay connector, manual-automatic reset.
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026
Product details
Frequently asked questions
What is the adjustment range and trip class of the 3RB1026-1QB1?
The adjustment range is 6 to 25 A, and the trip class is Class 10, meaning it will trip within 10 seconds at 600% of the set current.
What is the mounting size and connection type?
It uses size S0 individual mounting with screw connections, and includes a built-on relay connector for the alarm/ trip contacts.
MPN
3RB1026-1QB1