{"product_id":"lennox-100438-05-definite-purpose-contactor-40-amp-1-pole-24-vac-50-60-hz","title":"Lennox 100438-05 Definite Purpose Contactor – 40 Amp, 1-Pole, 24 VAC, 50\/60 Hz 10F74","description":"\u003ch1 class=\"MsoNormal\"\u003e\u003cb\u003eLennox 100438-05 Definite Purpose Contactor – 40 Amp, 1-Pole, 24 VAC, 50\/60 Hz\u003c\/b\u003e\u003c\/h1\u003e\n\u003cp class=\"MsoNormal\"\u003eThe \u003cb\u003eLennox 100438-05 Definite Purpose Contactor\u003c\/b\u003e is an OEM HVAC electrical component designed to provide dependable switching for compressors, condenser fan motors, and other electrical loads in compatible Lennox heating and cooling equipment. Featuring a \u003cb\u003e40-amp rating\u003c\/b\u003e, \u003cb\u003e1-pole configuration\u003c\/b\u003e, and \u003cb\u003e24 VAC coil\u003c\/b\u003e, this contactor provides reliable control for residential and light commercial HVAC applications.\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003eDesigned for repeated electrical cycling, the \u003cb\u003e100438-05\u003c\/b\u003e allows the low-voltage control circuit to safely switch higher-voltage HVAC equipment on and off. Its 24-volt coil is compatible with standard HVAC control circuits, making it an ideal replacement when the original contactor has worn, burned, or pitted contacts.\u003c\/p\u003e\n\u003cdiv class=\"MsoNormal\" align=\"center\" style=\"text-align: center;\"\u003e\u003chr size=\"2\" width=\"100%\" align=\"center\"\u003e\u003c\/div\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cb\u003eKey Features and Function:\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e• \u003cb\u003e40 Amp Rating\u003c\/b\u003e – Designed for demanding HVAC electrical loads\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e• \u003cb\u003e1-Pole Configuration\u003c\/b\u003e – Provides single-pole switching for compatible equipment\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e• \u003cb\u003e24 VAC Coil\u003c\/b\u003e – Works with standard low-voltage HVAC control circuits\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e• \u003cb\u003e50\/60 Hz Operation\u003c\/b\u003e – Suitable for compatible 50 Hz and 60 Hz electrical systems\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e• \u003cb\u003eDefinite Purpose Design\u003c\/b\u003e – Engineered specifically for HVAC and motor-control applications\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e• \u003cb\u003eOEM Lennox Replacement\u003c\/b\u003e – Designed for compatible Lennox heating and cooling equipment\u003c\/p\u003e\n\u003cdiv class=\"MsoNormal\" align=\"center\" style=\"text-align: center;\"\u003e\u003chr size=\"2\" width=\"100%\" align=\"center\"\u003e\u003c\/div\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cb\u003eProduct Details and Key Specifications:\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e• \u003cb\u003ePart Number:\u003c\/b\u003e 100438-05\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e• \u003cb\u003eCatalog Number:\u003c\/b\u003e 10F74\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e• \u003cb\u003eManufacturer:\u003c\/b\u003e Lennox\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e• \u003cb\u003ePart Type:\u003c\/b\u003e Definite Purpose Contactor\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e• \u003cb\u003eCurrent Rating:\u003c\/b\u003e 40 Amps\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e• \u003cb\u003eNumber of Poles:\u003c\/b\u003e 1\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e• \u003cb\u003eCoil Voltage:\u003c\/b\u003e 24 VAC\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e• \u003cb\u003eFrequency:\u003c\/b\u003e 50\/60 Hz\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e• \u003cb\u003eApplication:\u003c\/b\u003e Air Conditioners, Heat Pumps, Condensing Units, and Packaged HVAC Equipment\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e• \u003cb\u003eFunction:\u003c\/b\u003e Controls High-Voltage Electrical Loads Using a Low-Voltage Control Signal\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e• \u003cb\u003eInstallation Type:\u003c\/b\u003e OEM Replacement\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e• \u003cb\u003eCompatible Brand:\u003c\/b\u003e Lennox\u003c\/p\u003e\n\u003cdiv class=\"MsoNormal\" align=\"center\" style=\"text-align: center;\"\u003e\u003chr size=\"2\" width=\"100%\" align=\"center\"\u003e\u003c\/div\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cb\u003e\u003cspan style=\"font-family: 'Segoe UI Emoji',sans-serif; mso-bidi-font-family: 'Segoe UI Emoji';\"\u003e🛠️\u003c\/span\u003e HVAC Depot Pro Tip: Inspect the Contactor Contacts\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003eBurned, pitted, or heavily discolored contact points can cause intermittent compressor operation, voltage drops, excessive heat, and equipment failure. When replacing a contactor, inspect the wiring terminals and capacitor for signs of overheating or damage.\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003eAlways disconnect electrical power before servicing HVAC electrical components.\u003c\/p\u003e\n\u003cdiv class=\"MsoNormal\" align=\"center\" style=\"text-align: center;\"\u003e\u003chr size=\"2\" width=\"100%\" align=\"center\"\u003e\u003c\/div\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003cb\u003eCross-Reference \u0026amp; Compatibility:\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003eThe \u003cb\u003eLennox 100438-05\u003c\/b\u003e is intended for compatible HVAC equipment requiring:\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e• \u003cb\u003eOEM Part Number:\u003c\/b\u003e 100438-05\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e• \u003cb\u003eCatalog Number:\u003c\/b\u003e 10F74\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e• \u003cb\u003eContactor Type:\u003c\/b\u003e Definite Purpose\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e• \u003cb\u003eCurrent Rating:\u003c\/b\u003e 40 Amp\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e• \u003cb\u003eCoil Voltage:\u003c\/b\u003e 24 VAC\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e• \u003cb\u003ePoles:\u003c\/b\u003e 1\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e• \u003cb\u003eFrequency:\u003c\/b\u003e 50\/60 Hz\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e• \u003cb\u003eCompatible Equipment:\u003c\/b\u003e Select Lennox air conditioners, heat pumps, condensing units, and packaged HVAC systems\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e\u003ci\u003eAlways verify the OEM part number, coil voltage, amperage rating, pole configuration, terminal arrangement, and mounting dimensions before ordering.\u003c\/i\u003e\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003e \u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":53713790599531,"sku":"66255146686","price":46.42,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0922\/9683\/9531\/files\/10f74.jpg?v=1786566210","url":"https:\/\/tophvacparts.com\/products\/lennox-100438-05-definite-purpose-contactor-40-amp-1-pole-24-vac-50-60-hz","provider":"HVAC Parts and Equipment Depot Open To Homeowners and Contractors","version":"1.0","type":"link"}