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Transparent Eaton FH25 thermal unit, bimetallic overload protection

Eaton

Eaton FH25 Thermal Unit 2.55-2.79A

SKU CH-15J8-SAB1S

Bimetallic thermal overload unit trips at 2.55–2.79 A for NEMA 0–2 starters

  • TypeBimetallic
  • ColorTransparent
  • Bimetallic thermal protection trips reliably at overload currents
  • Trip Class 20 ensures consistent response time for motor circuits
  • Covers full-load currents from 2.16 to 2.79 amperes
  • Fits NEMA sizes 0, 1 and 2 starters directly
  • Compatible with Series A200 and B100 overload relays

Eaton FH25 Thermal Unit overview

The Eaton FH25 is a bimetallic thermal overload unit designed for motor protection in industrial control panels. It suits maintenance engineers and panel builders who need reliable trip performance for compatible NEMA starters.

Bimetallic construction and mounting compatibility

The transparent housing allows visual inspection of the bimetallic element while the unit mounts directly into Series A200 and B100 starters. It matches Grainger part numbers 11Z488 through 11Z497 for straightforward replacement in existing installations.

Trip Class 20 thermal response

Rated for Trip Class 20, the unit operates across full-load current ranges of 2.16 to 2.35 A and 2.49 to 2.72 A, with a nominal range of 2.55 to 2.79 A. The bimetallic mechanism provides consistent thermal protection without auxiliary power or audible noise during normal operation.

Highlights

  • Bimetallic thermal protection trips reliably at overload currents
  • Trip Class 20 ensures consistent response time for motor circuits
  • Covers full-load currents from 2.16 to 2.79 amperes
  • Fits NEMA sizes 0, 1 and 2 starters directly
  • Compatible with Series A200 and B100 overload relays

Specifications

BrandEaton
ModelFH25
TypeBimetallic
ColorTransparent

Questions about this item

What trip class does the FH25 thermal unit use, and what overload current range does it cover?

The unit operates at Trip Class 20 and protects overloads from 2.16 to 2.35 A and from 2.49 to 2.72 A.

Which NEMA starter sizes and series does the FH25 fit?

It is compatible with NEMA Size 0, 1 and 2 starters and with Series A200 and B100 contactors.

How is the FH25 installed, and what step is often missed?

Snap the bimetallic unit into the overload relay block on the contactor; the step often missed is matching the exact current range to the motor full-load amps.

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