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Transparent thermal overload unit with current rating markings

Eaton

Eaton MSH8-8A thermal unit 7.04-7.74 A

SKU CH-KGPT-5P4WT

Thermal overload unit rated 7.04 to 7.74 A with trip class 20 for NEMA sizes 1, 3, 4, 5 and Series MS starters

  • TypeIndustrial Electrical Controls & Automation
  • ColorTransparent
  • Thermal overload protection for 7.04 to 7.74 A motors
  • Trip Class 20 suits standard motor starting profiles
  • Fits NEMA Size 1, 3, 4, 5 starters
  • Compatible with Series MS and MST01/MST02 ranges
  • Transparent housing allows visual inspection of trip status

Eaton MSH8-8A Thermal Unit

The Eaton MSH8-8A is a thermal overload protection unit designed for industrial motor control circuits. It provides Trip Class 20 protection for full-load currents between 7.04 and 7.74 amperes. This component fits NEMA Size 1, 3, 4 and 5 starters and is compatible with Series MS devices.

Electrical maintenance teams and panel builders

This unit suits maintenance teams replacing a failed thermal element in existing Series MS starters without rewiring. It is not for circuits operating outside the 7.04 to 7.74 A range or for starters that require a different trip class. Buyers needing protection for other current ratings or NEMA sizes must select a different thermal unit.

7.04 to 7.74 A full-load current range

The decisive specification is the 7.04 to 7.74 ampere full-load current window. The thermal unit will only protect motors whose nameplate current falls inside this band. Verify the motor rating before ordering; an incorrect rating defeats the overload protection.

Highlights

  • Thermal overload protection for 7.04 to 7.74 A motors
  • Trip Class 20 suits standard motor starting profiles
  • Fits NEMA Size 1, 3, 4, 5 starters
  • Compatible with Series MS and MST01/MST02 ranges
  • Transparent housing allows visual inspection of trip status

Specifications

BrandEaton
TypeIndustrial Electrical Controls & Automation
ColorTransparent

Questions about this item

How can I verify the thermal unit trips correctly after installation?

The unit is a Trip Class 20 thermal overload device rated for 7.04 to 7.74 A full-load current; it should open the circuit when the motor current exceeds this range for the Class 20 time-current characteristic.

What comes in the box and what must be purchased separately?

The package contains the Eaton MSH8-8A thermal unit only; a compatible Series MS overload relay such as MST01, MST01AH, MST01DN, MST01DN1P, MST01EH, MST01FN, MST01SN or MST01SN1P must be bought separately.

Which version should I choose for a NEMA Size 3 starter?

The MSH8-8A covers NEMA Sizes 1, 3, 4 and 5 with a 7.04 to 7.74 A range; select this unit when the motor full-load current falls inside that window.

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