{"product_id":"eaton-aa43p-nema-a200-thermal-overload-relay-3-pole-19-135a-panel-mount-class-20","title":"Eaton AA43P – NEMA A200 Thermal Overload Relay | 3-Pole | 19–135A | Panel Mount | Class 20","description":"\u003cp\u003eThe \u003cstrong\u003eEaton AA43P\u003c\/strong\u003e is a NEMA Size 4 thermal overload relay engineered for robust motor protection in high-current industrial applications. With a \u003cstrong\u003efull-load amp range of 19 to 135 amps\u003c\/strong\u003e and \u003cstrong\u003eClass 20\u003c\/strong\u003e trip characteristics, this ambient-compensated, three-pole relay is designed for panel mounting on A200 NEMA starter assemblies. It safeguards motors against overload, phase unbalance, and single-phasing conditions — delivering reliable, maintenance-friendly protection across heavy-duty environments.\u003c\/p\u003e\n\u003ch3\u003eWhat Is a Thermal Overload Relay?\u003c\/h3\u003e\n\u003cp\u003eA thermal overload relay protects motors by monitoring current and interrupting the control circuit when sustained overcurrent is detected. It uses bimetallic thermal heater elements: as motor current exceeds safe levels, heat causes the bimetal to deflect, tripping the relay and opening the motor circuit. This prevents winding damage and motor burnout. The AA43P’s ambient compensation feature adjusts the trip point based on surrounding temperature, making it accurate in both hot and cold environments.\u003c\/p\u003e\n\u003ch3\u003eKey Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e AA43P\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Eaton (Cutler-Hammer)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeries:\u003c\/strong\u003e A200 \/ Freedom NEMA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNEMA Size:\u003c\/strong\u003e 4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePoles:\u003c\/strong\u003e 3-Pole\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFull Load Amp Range:\u003c\/strong\u003e 19 – 135A\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTrip Class:\u003c\/strong\u003e Class 20\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Thermal Type A\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAuxiliary Contact:\u003c\/strong\u003e 1 Normally Closed (1NC)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAmbient Compensation:\u003c\/strong\u003e Yes (Compensated)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting:\u003c\/strong\u003e Panel mounted\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReset:\u003c\/strong\u003e Manual or Automatic\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible With:\u003c\/strong\u003e Eaton A200 NEMA motor starters\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eLarge three-phase motor protection (pumps, compressors, fans)\u003c\/li\u003e\n\u003cli\u003eIndustrial motor control centers (MCCs)\u003c\/li\u003e\n\u003cli\u003eHVAC and refrigeration equipment\u003c\/li\u003e\n\u003cli\u003eConveyor systems and material handling\u003c\/li\u003e\n\u003cli\u003eManufacturing automation and process control\u003c\/li\u003e\n\u003cli\u003eWater and wastewater treatment systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eAA43P vs AA43A – Mounting Difference\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eAA43P\u003c\/strong\u003e is panel mounted, making it suitable for standalone installations where the relay is mounted directly to a panel or enclosure surface. The \u003cstrong\u003eAA43A\u003c\/strong\u003e is starter mounted and installs directly onto the A200 contactor body. Both share the same 19–135A full-load range and Class 20 trip characteristics.\u003c\/p\u003e\n\u003ch3\u003eWhy Choose Eaton Freedom NEMA Overload Relays?\u003c\/h3\u003e\n\u003cp\u003eEaton’s A200 Freedom NEMA overload relays feature adjustable bimetallic ambient-compensated protection, interchangeable heater packs, and screw-type power terminals with captive, backed-out self-lifting pressure plates — significantly reducing installation and maintenance time. Available in sizes covering applications up to 900 HP, these relays minimize inventory complexity while maximizing coverage.\u003c\/p\u003e","brand":"Eaton","offers":[{"title":"New","offer_id":48396195430648,"sku":"AA43P-N","price":574.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/1209\/3176\/files\/AA43P.png?v=1779906878","url":"https:\/\/alphabreakersandcontrols.com\/products\/eaton-aa43p-nema-a200-thermal-overload-relay-3-pole-19-135a-panel-mount-class-20","provider":"Alpha Breakers \u0026 Controls","version":"1.0","type":"link"}