Eaton FH26 Thermal Unit Trip Class 20

Eaton FH26 Thermal Unit

The Eaton FH26 is a thermal overload unit rated Trip Class 20 for industrial motor starters. It protects NEMA Size 0, 1 and 2 contactors by interrupting power when current exceeds the calibrated range. Electrical contractors and maintenance engineers select it for replacement or new panel builds requiring Class 20 thermal response.

Compatibility check

Verify that the motor full-load current falls within 2.36 to 2.58 A or 2.73 to 2.99 A before ordering. Confirm the starter is a Series A200 or B100 model, as the unit mounts only on those frames. Cross-reference the Grainger part numbers 11Z488 through 11Z497 to ensure the correct heater table match for the application.

Build and mounting

The transparent housing lets technicians visually confirm trip status without removing the cover. The unit snaps directly onto compatible NEMA contactors, so no extra brackets or wiring harnesses are needed. Its thermal mechanism resets manually after a fault, providing a clear tactile indication that the overload condition has been cleared.