{"product_id":"trane-ctr03021-oem-definite-purpose-contactor-2-pole-24v-40a","title":"Trane CTR03021 – OEM Definite Purpose Contactor | 2-Pole | 24V | 40A","description":"\u003ch1\u003eTrane P\/N CTR03021 – Genuine OEM Definite Purpose Contactor (2-Pole, 24V, 40A)\u003c\/h1\u003e\n\u003cp\u003eThe \u003cstrong\u003eTrane CTR03021\u003c\/strong\u003e is a Genuine Original Equipment Manufacturer (OEM) definite purpose contactor, primarily used in Trane and American Standard air conditioning and heat pump systems. This heavy-duty 2-pole contactor is engineered to manage the high-current electrical loads of compressors and fan motors, ensuring reliable system start-ups and operation. Choosing an authentic Trane replacement ensures the exact electrical ratings and mounting compatibility required by your HVAC unit, preventing premature component failure or safety hazards common with lower-quality generic alternatives. \u003c\/p\u003e\n\u003cp\u003eBeing an authentic OEM component, the CTR03021 features high-grade electrical contacts and a durable housing designed for superior heat resistance and electrical conductivity. This specific model is a standard replacement part, providing a stable 24V control circuit for single-phase equipment. Installing the original factory part maintains the system's UL\/CSA certifications and ensures compliance with factory-spec safety protocols.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eKey Features and Function:\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDefinite Purpose Design:\u003c\/strong\u003e Optimized specifically for HVAC and refrigeration systems with a focus on durability and high cycle life.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGenuine OEM Reliability:\u003c\/strong\u003e Official Trane replacement built to factory standards for exact fitment and long-term durability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnhanced Contact Life:\u003c\/strong\u003e High-grade contacts resist pitting and welding under heavy electrical loads.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard Mounting:\u003c\/strong\u003e Features a universal foot-mounting base that allows for easy replacement in most 2-pole applications. \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eProduct Details and Key Specifications:\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e CTR03021\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCatalog #:\u003c\/strong\u003e N\/A (Part number serves as catalog ID)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Trane \/ American Standard\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Type:\u003c\/strong\u003e Definite Purpose Contactor\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePoles:\u003c\/strong\u003e 2-Pole\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoil Voltage:\u003c\/strong\u003e 24 VAC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFull Load Amps (FLA):\u003c\/strong\u003e 40A\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResistive Amps (RES):\u003c\/strong\u003e 40A\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSwitching Voltage:\u003c\/strong\u003e Up to 600 VAC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTerminal Connection:\u003c\/strong\u003e Lug or Quick Connect\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGross Shipping Weight:\u003c\/strong\u003e 0.7 LB \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003e🛠️ HVAC Depot Pro Tip: The \"Pitting and Buzzing\" Test\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eOver time, the high-voltage contacts inside your CTR03021 will begin to \"pit\" or develop carbon buildup from electrical arcing. If you hear a loud \"buzzing\" or \"chattering\" sound when the unit calls for cooling, or if your outdoor fan runs but the compressor won't start, the contactor is likely failing. Even if the coil tests fine with a multimeter, excessive pitting creates high resistance that can overheat and destroy your compressor. Always replace a noisy or burnt contactor immediately to avoid a much more expensive repair. \u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eCross-Reference:\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eThe CTR03021 is a direct OEM replacement for the following part numbers:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM \u0026amp; Catalog Numbers:\u003c\/strong\u003e CTR03021, CNT03021, HW20AA107, 3021.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand Specific Replacements:\u003c\/strong\u003e Honeywell DP2030A5002, Supco DP30242, Mars 33234. \u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eExtensive Model Compatibility List:\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003e\u003cem\u003eNote: Use 'CTRL+F' to search for your specific model:\u003c\/em\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eTrane\/American Standard AC and HP Units (Specific Models):\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e4TTA3030A1000AA, 4TTA3036A1000AA, 4TTA4030A1000AA, 4TTA4036A1000AA\u003c\/li\u003e\n\u003cli\u003e2TTA3F36A1000AA, 2TTB3F36A1000AA\u003c\/li\u003e\n\u003cli\u003e4TWB3030A1000AA, 4TWB3036A1000AA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"TRANE US INC","offers":[{"title":"Default Title","offer_id":52929103626603,"sku":"CTR03021","price":39.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0922\/9683\/9531\/files\/CTR03021.jpg?v=1771604176","url":"https:\/\/tophvacparts.com\/products\/trane-ctr03021-oem-definite-purpose-contactor-2-pole-24v-40a","provider":"HVAC Parts and Equipment Depot: Homeowners \u0026 Contractors Welcome | Plano, TX","version":"1.0","type":"link"}