The TA75DU32 is a thermal bimetallic overload relay in Eaton's A-Line family, sized for 22–32 A and Trip Class 10. It's the part that sits between the contactor and the motor — if the motor pulls sustained overcurrent, the bimetal strip heats, trips the NC contact in the control circuit, and drops the contactor out before the winding cooks. Selectable manual or automatic reset means you can set it to latch on fault for attended lines or auto-reset for remote or unattended pumps. Three-pole, NEMA type, and designed to mount directly to A-Line contactors in the A/AE/AF50 through A/AE/AF75 frame range. If you're building a panel or replacing a cooked relay on a line-down call, the frame match is the first check — this one lands on those specific contactor frames, not the smaller or larger ones.
The 22–32 A adjustable range covers a lot of common motor FLA bands — 7.5 to 15 HP at 460 V three-phase, roughly. Trip Class 10 means it trips in 10 seconds or less at 600% of the set current, which is standard for standard-duty induction motors; you don't need Class 20 or 30 unless you're starting high-inertia loads like centrifuges or large fans. Thermal bimetallic construction means ambient temperature affects the trip curve — if the relay lives in a hot enclosure next to the contactor, derate or ventilate. No electronic adjustment or communications; it's a straight electromechanical overload block. That's a feature when you're fixing it where it sits — no configuration tool, no software version to match.
Panel fit and wiring note
Mounts directly to the A-Line contactor — no separate DIN-rail footprint, no additional bracket. Strip length around 8 mm.