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The EATON FH43 is a thermal overload relay heater element designed for use with Type A and Type B overload relays in motor control applications. This heater element generates heat proportional to motor current, allowing the overload relay to trip and protect the motor from sustained overcurrent conditions. Sized and calibrated to match specific full-load amperage ranges, the FH43 is a precision replacement component installed by licensed electricians and motor control technicians during panel service or motor starter maintenance.
The FH43 heater element is used in industrial and commercial motor control centers, motor starter assemblies, and combination starters. It is suited for applications where motor overload protection is required on three-phase or single-phase systems. This element is a direct OEM-style replacement for worn, damaged, or improperly sized heater elements in compatible EATON overload relay housings. Installation is typically performed during scheduled maintenance or after a motor failure event requiring root-cause correction.
Designed as an OEM-style replacement heater element for EATON Type A and Type B thermal overload relays used in motor control and motor starter assemblies.
Installation of overload relay heater elements must be performed by a qualified electrician following NEC guidelines. Disconnect and lock out all power to the motor starter or motor control center before removing or installing heater elements. Verify the heater element amperage rating matches the motor full-load amp rating on the nameplate before installation. Do not operate the overload relay with missing or mismatched heater elements.
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