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Transparent rectangular thermal unit with bimetallic element and terminal markings

Eaton

Eaton FH30 Thermal Unit 4.04-4.40A

SKU CH-KZ04-MGQF7

Bimetallic thermal overload unit covers 4.04 to 4.40 A for NEMA 0, 1 and 2 starters

  • TypeBimetallic
  • ColorTransparent
  • Reliable overload protection for 3.43–3.73 A loads
  • Thermal trip class 20 suits motor circuits
  • Bimetallic 1.300 element reacts to sustained overcurrent
  • Fits NEMA sizes 0, 1 and 2 starters
  • Compatible with Series A200 and B100 contactors

Eaton FH30 Thermal Unit for Motor Protection

The Eaton FH30 is a bimetallic thermal overload relay designed for NEMA Size 0, 1 and 2 starters. It provides Trip Class 20 protection for motors with full-load currents between 3.43 and 4.40 amperes. The transparent housing allows visual inspection of the trip mechanism. Compatible with Series A200 and B100 contactors.

Sustained Overload Response

Under continuous overload the bimetallic element heats proportionally to motor current, delivering an inverse-time trip curve that matches Trip Class 20 requirements. This behaviour prevents nuisance tripping during normal start-up while ensuring disconnect within the defined time band for sustained faults. The unit resets manually after cooling.

Replaces Worn or Mismatched Heaters

This thermal unit replaces original heaters in Eaton Cutler-Hammer starters when the motor nameplate current falls within the 3.43 to 4.40 A range. The upgrade is worth it when existing heaters are corroded, have tripped repeatedly, or no longer match the installed motor rating. It does not suit applications requiring electronic overload features or current ranges outside the stated bands.

Highlights

  • Reliable overload protection for 3.43–3.73 A loads
  • Thermal trip class 20 suits motor circuits
  • Bimetallic 1.300 element reacts to sustained overcurrent
  • Fits NEMA sizes 0, 1 and 2 starters
  • Compatible with Series A200 and B100 contactors

Specifications

BrandEaton
ModelFH30
TypeBimetallic
ColorTransparent

Questions about this item

Does the FH30 thermal unit generate noticeable heat or noise during continuous operation?

The bimetallic FH30 is a passive overload relay with no fan or moving parts, so it runs silently and adds negligible heat to the enclosure.

Which contactor or starter must I already have for this FH30 unit to fit and protect the circuit?

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

Will the FH30 work with the older A200 or B100 starters I am keeping in the panel?

Yes, the unit is listed as compatible with both Series A200 and B100 equipment, so it can replace the original thermal unit in those starters.

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