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B3.30 - Square D - Overload Relay Thermal Unit Max Amp_ 3A QOU150 - Square D UnitB3. 30 Square D Overload Relay Thermal Unit Square D plug in mounting standard thermal overload heater unit sensing method melting alloy, Standard Trip, full load ampere 2. 32 to 2. 94 Amp. Manufacturer: Schneider Electric Family: B Series Type: B Overload Heater Specifications Thermal Unit Motor Tripping Class: 20 Sensing Method : Melting Alloy Plug In Mounting Full Load Amps: 2. 32 to 2. 94 Amp Trip Type: Standard Trip Authentic Square D Product.