We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Transparent thermal overload unit with FH39 marking

Eaton

Eaton FH39 Cutler-Hammer Thermal Unit 8.82-9.58A

SKU CH-15TR-MY4DZ

Thermal overload unit rated 8.82 to 9.58 A, Trip Class 20, compatible with NEMA sizes 0, 1, 2 and Series A200, B100 starters

  • TypeIndustrial Electrical Controls & Automation
  • ColorTransparent
  • Reliable motor protection with Trip Class 20 thermal overload
  • Accurate trip response across 7.9 to 8.5 A and 9.1 to 9.9 A ranges
  • Broad compatibility with NEMA Size 0, 1, 2 starters
  • Direct fit for Series A200 and B100 contactors
  • Matches multiple Grainger and manufacturer model numbers

Eaton FH39 Thermal Unit

The Eaton FH39 Cutler-Hammer thermal unit provides Trip Class 20 overload protection for motor starters. It covers a full-load current range of 8.82 to 9.58 amperes and fits NEMA Size 0, 1, and 2 devices. The transparent housing allows visual inspection of the internal mechanism. It is designed for industrial electrical control panels requiring reliable thermal tripping.

Panel builders using Series A200 or B100 starters

This unit suits maintenance teams replacing thermal elements in compatible Eaton starters listed by Grainger part numbers 11Z488 through 11Z497. It is not for applications needing electronic overload relays or adjustable trip settings. Buyers requiring protection outside the 7.9 to 9.9 ampere specification must select a different heater element.

8.82 to 9.58 ampere operating window

The heater comfortably handles motors with full-load currents between 7.9 and 8.5 amperes or 9.1 and 9.9 amperes per the manufacturer data. It runs out of range for loads below 7.9 amperes or above 9.9 amperes, where a different thermal unit rating is required. The Trip Class 20 response suits standard motor acceleration profiles.

Highlights

  • Reliable motor protection with Trip Class 20 thermal overload
  • Accurate trip response across 7.9 to 8.5 A and 9.1 to 9.9 A ranges
  • Broad compatibility with NEMA Size 0, 1, 2 starters
  • Direct fit for Series A200 and B100 contactors
  • Matches multiple Grainger and manufacturer model numbers

Specifications

BrandEaton
TypeIndustrial Electrical Controls & Automation
ColorTransparent

Questions about this item

Which Eaton motor starter series must I already have for the FH39 thermal unit to fit?

The FH39 fits Series A200 and B100 motor starters in NEMA sizes 0, 1, and 2.

Will the FH39 protect an older B100J0B starter the same way it protects newer B100 models?

Yes, the FH39 is listed as compatible with the B100J0B and all other B100 variants shown.

How can I confirm the FH39 is tripping correctly after installation?

Apply a load within the 8.82 to 9.58 A range; the thermal element should open the circuit on sustained overload per Trip Class 20 timing.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.