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Transparent Eaton FH23 thermal unit with current range markings

Eaton

Eaton FH23 Thermal Unit 2.11-2.32A

SKU CH-4Y8X-JB3A4

Thermal overload unit covering 2.11 to 2.32 A for NEMA 0, 1, 2 starters

  • TypeIndustrial Electrical Controls & Automation
  • ColorTransparent
  • Thermal overload protection for motors rated 2.11 to 2.32 A
  • Trip Class 20 ensures reliable overload response
  • Compatible with Series A200 and B100 motor starters
  • Fits NEMA Size 0, 1 and 2 contactors
  • Transparent housing allows visual inspection of trip status

FH23 Thermal Unit for Overload Protection

The Eaton FH23 thermal unit provides overload protection for motor starters and contactors. It covers a full-load current range of 2.11 to 2.32 amperes and suits NEMA sizes 0, 1 and 2. Electrical technicians and panel builders use it to replace worn or damaged heater elements in compatible assemblies.

Trip Class 20 Thermal Response

This unit operates at Trip Class 20, meaning it trips within a defined time under sustained overcurrent. The thermal mechanism reacts to heating from load current rather than ambient temperature alone. Power draw is negligible because the element is passive and carries only the motor current.

Sustained Overload Behaviour

Under continuous overload the element heats progressively and opens the control circuit when the trip threshold is reached. It does not reset automatically; the starter must be manually re-engaged after the fault clears. The 1.79 to 1.95 A and 2.07 to 2.26 A ratings apply to other models in the same series.

Highlights

  • Thermal overload protection for motors rated 2.11 to 2.32 A
  • Trip Class 20 ensures reliable overload response
  • Compatible with Series A200 and B100 motor starters
  • Fits NEMA Size 0, 1 and 2 contactors
  • Transparent housing allows visual inspection of trip status

Specifications

BrandEaton
TypeIndustrial Electrical Controls & Automation
ColorTransparent

Questions about this item

How is the Eaton FH23 thermal unit installed and which step is often missed?

Snap the unit into the overload relay base for NEMA size 0, 1 or 2 starters; the step often missed is verifying the full-load current falls within the 2.11-2.32 A range before closing the cover.

What maintenance or replacement will the Eaton FH23 thermal unit need later?

Replace the thermal unit after a trip event or when the heater element shows discolouration; no lubrication or cleaning is required for the sealed Trip Class 20 element.

What limit appears first on the Eaton FH23 thermal unit under sustained overload?

The thermal element reaches its Trip Class 20 time-current limit first, opening the circuit when current exceeds the 2.11-2.32 A rating for the defined trip time.

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