Arrow Hart 42012 Overload Heater, Pack of 3

The Arrow Hart 42012 Overload Heater is a thermal protection element designed for use in motor starters and overload relays, providing reliable overcurrent protection for electric motors. These heaters are typically installed in NEMA-rated motor controllers to safeguard against excessive heat buildup due to overload conditions, preventing motor damage and downtime. Key features include a ceramic body with spring-loaded contacts for secure mounting and a bimetallic or eutectic alloy element that trips the relay when current exceeds safe limits. Advantages over similar products include compatibility with legacy Arrow Hart and Eaton systems, ease of replacement, and cost-effectiveness for industrial applications such as conveyor systems, pumps, and HVAC equipment. Drawbacks may include limited availability due to the brand's acquisition by Eaton and the need for precise matching to motor full-load amperage (FLA) to avoid nuisance trips or insufficient protection. These units are ideal for low to medium horsepower motors in manufacturing and process control environments, offering a balance of durability and sensitivity. Based on image analysis, this pack appears used with some dirt accumulation, but functional integrity seems intact. For optimal performance, pair with compatible overload relays like those from Eaton's Freedom series.