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Transparent thermal overload unit with adjustment dial and terminal block

Eaton

Eaton MSH11-7A Thermal Unit Trip Class 20 9.36-10.3 A

SKU CH-28SE-X580D

Thermal overload unit rated 9.36 to 10.3 A, Trip Class 20, fits NEMA sizes 1, 3, 4, 5 and Series MS starters

  • TypeIndustrial Electrical Controls & Automation
  • ColorTransparent
  • Thermal overload protection rated for 9.36-10.3 A full load current
  • Trip Class 20 response suits motor start-up profiles
  • Fits NEMA size 1, 3, 4 and 5 starters
  • Compatible with Eaton MS series and listed MST models
  • Transparent housing allows visual inspection of trip status

Eaton MSH11-7A Thermal Unit

The Eaton MSH11-7A is a thermal overload unit rated for Trip Class 20 with a full-load current range of 9.36 to 10.3 A. It fits NEMA Size 1, 3, 4, and 5 starters and is compatible with Series MS devices. Industrial maintenance teams and panel builders use it to replace worn or tripped elements in existing motor control gear.

Trip Class 20 response time

Trip Class 20 defines the maximum time the unit allows an overload before tripping, which is slower than Class 10 or Class 5 units. This characteristic suits motors with longer acceleration cycles but will not protect fast-trip requirements. Installers must verify that the application’s startup profile matches Class 20 timing to avoid nuisance trips or insufficient protection.

9.36 to 10.3 A current range

The decisive specification is the 9.36 to 10.3 A full-load current window; the unit will not protect motors operating outside this band. Buyers needing coverage for lower or higher current motors must select a different thermal unit. Compatibility with the listed Series MS and Grainger part numbers confirms mechanical fit, but electrical sizing remains the single factor that decides suitability.

Highlights

  • Thermal overload protection rated for 9.36-10.3 A full load current
  • Trip Class 20 response suits motor start-up profiles
  • Fits NEMA size 1, 3, 4 and 5 starters
  • Compatible with Eaton MS series and listed MST models
  • Transparent housing allows visual inspection of trip status

Specifications

BrandEaton
TypeIndustrial Electrical Controls & Automation
ColorTransparent

Questions about this item

Which trip class and current range should I pick for my motor starter?

This thermal unit is fixed at Trip Class 20 and covers a full-load current range of 9.36 to 10.3 A; choose it only when your motor’s nameplate current falls inside that window.

What does Trip Class 20 mean for actual overload protection?

Trip Class 20 allows the motor to run at locked-rotor current for roughly 20 seconds before the thermal unit opens, giving a slower response than Class 10 or 5 units.

Which NEMA starter sizes and series does this unit fit?

It is compatible with NEMA Sizes 1, 3, 4 and 5 and works with Eaton Series MS starters, including the MST01 and MST02 model families listed.

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