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Transparent thermal unit FH53 with bimetallic element

Eaton

Eaton FH53 Thermal Unit 26.50-28.50A

SKU CH-F1V0-F034R

A bimetallic thermal overload unit rated 26.50–28.50 A, Trip Class 20, for NEMA Size 2 starters

  • TypeBimetallic
  • ColorTransparent
  • Thermal overload protection with 26.50-28.50 A trip range
  • Trip Class 20 ensures coordinated motor protection
  • Bimetallic 1.900 element reacts to sustained overcurrent
  • Fits NEMA Size 2 starters for direct replacement
  • Compatible with Series A200 and B100 contactors

FH53 Thermal Unit 26.50-28.50A

The Eaton FH53 is a bimetallic thermal unit rated for a full-load current range of 26.50 to 28.50 amperes. It provides overload protection for NEMA Size 2 motor starters in industrial control panels. The transparent housing allows visual inspection of the trip mechanism. It is designed for use with Series A200 and B100 starters.

Trip Class 20 overload characteristic

This unit operates on Trip Class 20 timing, meaning it will trip within a defined period under sustained overload conditions to protect motor windings. The bimetallic element responds to heat generated by excessive current. No separate accessories or software are included; the unit functions as a direct replacement component. Compatibility is defined by the starter model series.

For maintenance on Series A200 or B100 starters

Electrical technicians servicing compatible Eaton Cutler-Hammer starters can install this unit to restore overload protection. It suits panels where the motor full-load current falls within the 28.8 to 31.4 or 33.4 to 36.4 ampere ranges. Installers working with different NEMA sizes or non-compatible starter series must select an alternative thermal unit.

Highlights

  • Thermal overload protection with 26.50-28.50 A trip range
  • Trip Class 20 ensures coordinated motor protection
  • Bimetallic 1.900 element reacts to sustained overcurrent
  • Fits NEMA Size 2 starters for direct replacement
  • Compatible with Series A200 and B100 contactors

Specifications

BrandEaton
ModelFH53
TypeBimetallic
ColorTransparent

Questions about this item

How often should the FH53 thermal unit be inspected or replaced under normal operation?

The FH53 is a bimetallic thermal unit rated for Trip Class 20 overload protection. It operates on a calibrated trip curve rather than a fixed service interval. Replacement is only required after a trip event or if the unit shows physical damage or calibration drift.

What is the maximum continuous current the FH53 can carry before its thermal element trips?

The FH53 covers a full-load current range of 28.8 to 31.4 A and 33.4 to 36.4 A. Sustained current above the upper end of the selected range will cause the bimetallic element to trip in accordance with its Trip Class 20 time-current characteristic.

How much heat does the FH53 dissipate when carrying rated current all day in an enclosed panel?

The bimetallic element generates heat proportional to the square of the load current. At the top of its 33.4 to 36.4 A range the unit dissipates several watts, so panel ventilation must be sized to remove that heat and keep ambient temperature within the starter's rating.

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