{"product_id":"oem-lennox-potential-relay-51m04","title":"OEM Lennox Potential Relay — 51M04","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e51M04\u003c\/strong\u003e potential relay controls the start capacitor in your compressor or motor circuit. During startup it keeps the start capacitor in the circuit to provide extra torque, then drops it out once the motor reaches speed based on the back-EMF (potential) it senses — protecting the start capacitor from overheating.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e A failed \u003cstrong\u003e51M04\u003c\/strong\u003e often results in a compressor that hums but won't start, trips the breaker, or starts hard and struggles. Because the relay and start capacitor work together, a bad relay can burn out capacitors repeatedly or leave the start cap in the circuit too long, leading to nuisance overload trips and premature compressor wear.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e Potential relays must match the correct pick-up and drop-out voltages for the motor they serve. The OEM Lennox \u003cstrong\u003e51M04\u003c\/strong\u003e is spec'd to the exact voltage thresholds and contact rating your Lennox equipment requires, ensuring reliable starts and protecting the compressor and start capacitor from damage that mismatched generic relays commonly cause.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081103851891,"sku":"LNX-51M04","price":24.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-capacitor-start-LNX-51M04.jpg?v=1783762885","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-potential-relay-51m04","provider":"National HVAC Parts","version":"1.0","type":"link"}