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Transparent thermal overload unit with FH31 label

Eaton

Eaton FH31 Cutler-Hammer Thermal Unit 4.41-4.81A

SKU CH-CC5N-N14EJ

Thermal overload unit rated 4.41 to 4.81 A, trip class 20, compatible with Series A200 and B100 starters

  • TypeIndustrial Electrical Controls & Automation
  • ColorTransparent
  • Trip Class 20 protects motors from sustained overloads
  • Full-load current range 3.74 to 4.81 A matches application needs
  • Compatible with Series A200 and B100 starters for direct fit
  • Transparent housing allows visual inspection of element condition
  • Works with NEMA Size 0, 1 and 2 controllers for broad use

Eaton FH31 Thermal Unit 4.41-4.81A

The Eaton FH31 Cutler-Hammer thermal unit provides overload protection for motor starters in industrial electrical control panels. It is designed for maintenance engineers and panel builders who need a direct replacement for Series A200 or B100 starters operating within the specified current range.

Trip Class 20 Thermal Overload

This unit operates with a Trip Class 20 thermal mechanism calibrated for full load currents between 3.74 to 4.07 A and 4.32 to 4.71 A. The thermal design responds to sustained overcurrent conditions to protect connected motors from heat damage without requiring external control voltage or programming.

Transparent Housing NEMA Size 0-2

The transparent housing allows visual inspection of the internal mechanism and trip indicator during routine maintenance checks. It fits NEMA Size 0, 1, and 2 starters and cross-references Grainger part numbers 11Z488 through 11Z497 for straightforward identification in existing inventory systems.

Highlights

  • Trip Class 20 protects motors from sustained overloads
  • Full-load current range 3.74 to 4.81 A matches application needs
  • Compatible with Series A200 and B100 starters for direct fit
  • Transparent housing allows visual inspection of element condition
  • Works with NEMA Size 0, 1 and 2 controllers for broad use

Specifications

BrandEaton
TypeIndustrial Electrical Controls & Automation
ColorTransparent

Questions about this item

Does the FH31 thermal unit require periodic replacement or recalibration after installation?

The thermal unit operates as a fixed-trip overload device with no moving parts to wear; it does not need scheduled replacement or recalibration under normal conditions.

What current level causes the FH31 to trip first during continuous operation?

The unit trips at the lower end of its 3.74 to 4.07 A full-load-current range when sustained current exceeds that threshold.

How much heat does the FH31 generate when it carries full load all day?

As a thermal overload element it dissipates only the I²R loss of the heater coil at the rated 3.74–4.07 A range, producing minimal heat inside the starter enclosure.

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