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Small transparent rectangular thermal overload unit with text markings

Eaton

Eaton MSH9-7A Thermal Unit Trip Class 20 7.75-8.46A

SKU CH-AGZF-C7KAJ

Thermal overload unit rated 7.75 to 8.46 A, trip class 20, compatible with NEMA sizes 1, 3, 4, 5 and Series MS starters

  • TypeIndustrial Electrical Controls & Automation
  • ColorTransparent
  • Thermal overload protection for motors up to 8.46 A
  • Trip Class 20 timing matches standard motor start curves
  • Fits NEMA sizes 1 3 4 5 starters
  • Compatible with Eaton MS series and MST models
  • Transparent housing allows visual inspection of trip status

Eaton MSH9-7A Thermal Unit

The Eaton MSH9-7A is a thermal overload protection unit designed for industrial motor control applications. It provides Trip Class 20 response for motors drawing between 7.75 and 8.46 amperes full load current. This component integrates with NEMA Size 1, 3, 4, and 5 starters.

Suited for Series MS starter maintenance

Maintenance teams replacing thermal units in compatible Eaton Series MS starters will find this a direct fit. It also crosses to Grainger part numbers 1H385, 1H396, and 1H397. Buyers protecting motors outside the 7.75 to 8.46 ampere range or using non-compatible starter series must select a different unit.

Trip Class 20 thermal protection

The defining specification is the Trip Class 20 rating combined with the 7.75 to 8.46 ampere full load current window. This determines the thermal trip curve and the motor current the unit protects. Verify the motor nameplate current falls strictly within this range before installation.

Highlights

  • Thermal overload protection for motors up to 8.46 A
  • Trip Class 20 timing matches standard motor start curves
  • Fits NEMA sizes 1 3 4 5 starters
  • Compatible with Eaton MS series and MST models
  • Transparent housing allows visual inspection of trip status

Specifications

BrandEaton
TypeIndustrial Electrical Controls & Automation
ColorTransparent

Questions about this item

Does the Eaton MSH9-7A generate noticeable heat or noise when running continuously at 8.46 A?

As a thermal overload unit it produces no fan noise; heat rise is limited to the normal warming of the bimetal element at its 7.75 to 8.46 A rating.

Which starter or contactor must I already own for the MSH9-7A to function?

It fits NEMA Size 1, 3, 4 or 5 starters in the Series MS range, including models such as MST01, MST02 and their AH, DN, EH, FN, SN variants.

Will the MSH9-7A work with an older Series MS starter I already have?

Yes, it is compatible with legacy Series MS models including MST01, MST02 and the listed sub-variants across NEMA Size 1, 3, 4 and 5.

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