Westinghouse AA33A Three Phase Thermal Overload Relay

The Westinghouse AA33A Three Phase Thermal Overload Relay is a panel-mounted protection device delivering dependable motor overload protection for industrial automation. Designed for use with motor starters and control panels, it protects three-phase motors in conveyors, pumps, compressors, HVAC equipment, and other factory automation machinery operating in commercial and industrial facilities. As a thermal overload relay, it safeguards motors from overload conditions to help prevent damage and unplanned downtime in automated production lines and material handling systems. Its installation supports motor control centers and power distribution environments, making it a common choice for panel-mounted industrial controls and retrofit projects. Common replacements listed for this type of relay include Eaton Freedom Overload Relay, Allen-Bradley Bulletin 592 Overload Relay, and Square D Class 9065 Overload Relay.