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Transparent bimetallic thermal unit, rectangular form factor

Eaton

Eaton MSH18-6A Thermal Unit 15.13-16A

SKU CH-5QJP-8R44Z

Bimetallic thermal overload unit trips at 15.13 to 16.00 A for NEMA sizes 1, 3, 4 and 5

  • TypeBimetallic
  • ColorTransparent
  • Bimetallic thermal trip protects motors from overload
  • Trip Class 20 rated for standard motor starting
  • Covers 15.13 to 16.00 A full-load range
  • Fits NEMA Size 1, 3, 4 and 5 starters
  • Compatible with multiple MS series models

Eaton MSH18-6A Thermal Unit

The Eaton MSH18-6A is a bimetallic thermal unit rated for 15.13 to 16.00 A full load current. It provides Trip Class 20 overload protection for motor starters. The unit fits NEMA Size 1, 3, 4, and 5 starters in the Series MS range.

Compatible starter models

This thermal unit works with Grainger part numbers 1H385, 1H396, and 1H397. It also matches manufacturer models including MST01, MST01AH, MST01DN, MST01EH, MST01FN, MST01SN, MST02, MST02AH, MST02DN, MST02EH, MST02FN1P, MST02RN1PH, and MST02SN variants.

Transparent bimetallic construction

The transparent housing allows visual inspection of the bimetallic element. The unit installs directly into compatible Series MS motor starters. It is not suitable for applications requiring a different trip class or current range outside 15.13 to 16.00 A.

Highlights

  • Bimetallic thermal trip protects motors from overload
  • Trip Class 20 rated for standard motor starting
  • Covers 15.13 to 16.00 A full-load range
  • Fits NEMA Size 1, 3, 4 and 5 starters
  • Compatible with multiple MS series models

Specifications

BrandEaton
ModelMSH18-6A
TypeBimetallic
ColorTransparent

Questions about this item

Will the bimetallic element need periodic replacement?

The bimetallic thermal unit is a one-time protective device; after it trips on overload it must be replaced rather than reset.

What current level causes the unit to trip first during continuous operation?

The unit trips when current exceeds the 15.13 to 16 A full-load range for the duration defined by Trip Class 20.

Does the unit generate noticeable heat or noise when installed in a motor starter all day?

It produces only the normal warmth of a bimetallic strip carrying up to 16 A and operates silently.

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