Square D PS005549AV Thermal Overload Relay Thermal Unit

Square D PS005549AV Thermal Overload Relay Thermal Unit is the B25.0 melting-alloy thermal unit designed to attach to Square D overload relays and magnetic motor starters, delivering thermal protection for AC motors up to 600 VAC. The unit is rated for a 40°C ambient and supports Type S and Type B melting-alloy configurations, offered as a Class 20 standard-trip device with manual operation, per Schneider Electric product pages and distributor listings. It is intended for use with melting-alloy thermal overload relays, NEMA overload relays, and other motor-control applications where dependable, heat-based protection is required. Typical FLA ranges associated with the B25.0 assembly vary by the number of heating elements: about 17.5–19.2 A for a single thermal unit and about 14.1–15.8 A for a three-element configuration, with exact values depending on the relay package and wiring.