{"product_id":"oem-lennox-contactor-3-pole-40a-110-120v-coil-72p57","title":"OEM Lennox Contactor 3-Pole 40A 110\/120V Coil — 72P57","description":"\u003cp\u003eThe Lennox \u003cstrong\u003e72P57\u003c\/strong\u003e is a genuine OEM three-pole contactor rated at 40 amps with a 110\/120-volt control coil. It serves as the main electrical switch in your Lennox outdoor unit, closing three sets of contacts to send line power to the compressor and condenser fan motor when the control circuit is energized. The higher-voltage coil is used on systems that switch the contactor with a 120V control signal rather than 24V.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms\u003c\/strong\u003e include an outdoor unit that fails to start, a loud hum or buzz from the contactor, contacts that stick closed and won't let the compressor cycle off, and visible arcing, pitting, or heat discoloration on the terminals. A contactor that drops out intermittently can also cause short-cycling and hard starts.\u003c\/p\u003e\u003cp\u003eInstalling the OEM \u003cstrong\u003e72P57\u003c\/strong\u003e ensures the correct 110\/120V coil rating, 40A contact capacity, and factory terminal layout that Lennox engineered for your equipment. Generic substitutes with mismatched coil voltage can fail to pull in or burn out quickly, risking damage to the compressor. The genuine Lennox part delivers reliable switching and a true drop-in fit.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081081405811,"sku":"LNX-72P57","price":28.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-contactor-3pole-LNX-72P57.jpg?v=1783759886","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-contactor-3-pole-40a-110-120v-coil-72p57","provider":"National HVAC Parts","version":"1.0","type":"link"}