Square D A1.39 Thermal Unit Overview

The Square D A1.39 is a thermal overload relay designed for use in industrial applications where reliable protection of electric motors is essential. It operates within a voltage range of 600V AC, making it suitable for various settings, including manufacturing plants, commercial buildings, and power distribution systems. This thermal unit is engineered to detect overheating of motors due to overload conditions. By monitoring the current flowing through the motor, it provides immediate protection against potential damage that can occur from prolonged excessive current draw. The A1.39 model operates at a current rating of 1.1 to 1.37A and is classified within Class 20, indicating that it is designed for applications requiring medium time delays when starting larger motors. This feature allows it to tolerate normal motor inrush currents at startup while ensuring timely disconnection during prolonged overloads, thus enhancing the operational life of both the motor and the relay. This product is characterized by its robust construction, ease of installation, and compatibility with various motor sizes, contributing significantly to safety and efficiency in electrical installations. Square D, as a brand, is well-recognized for its high-quality electrical components and has contributed considerably to advancements in electrical safety and motor control technology across diverse industries.