{"product_id":"elevator-relay-board-car-roof-interface-board-bt302-21kk-v4","title":"Elevator Relay Board BT302\/21KK V4.0 V4.1 – Car Roof Interface","description":"\n\u003ch2\u003eElevator Relay Board \u0026amp; Car Roof Interface Board – BT302\/21KK V4.0 \/ V4.1\u003c\/h2\u003e\n\u003cp\u003eKeep your elevator system running at peak performance with this precision-engineered \u003cstrong\u003eRelay Board and Car Roof Interface Board\u003c\/strong\u003e, compatible with BT302\/21KK models in versions V4.0 and V4.1. Whether you're a lift technician, building maintenance professional, or elevator service contractor, this replacement control board offers a direct-fit solution for restoring full elevator functionality quickly and reliably.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Designed for BT302\/21KK elevator systems, versions V4.0 and V4.1\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFunction:\u003c\/strong\u003e Serves as the relay board and car roof interface board — essential components for elevator control and signal routing\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Durable plastic housing with quality-grade electronic components for long service life\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDirect Replacement:\u003c\/strong\u003e Engineered to match OEM specifications for straightforward swap-out installation\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eReliable Performance:\u003c\/strong\u003e Ensures consistent signal relay and interface communication between the car roof and main control systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable style=\"border-collapse:collapse; width:100%;\"\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n    \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eCompatible Model\u003c\/strong\u003e\u003c\/td\u003e\n    \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eBT302\/21KK V4.0 \/ V4.1\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eBoard Type\u003c\/strong\u003e\u003c\/td\u003e\n    \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eRelay Board \/ Car Roof Interface Board\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n    \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n    \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003ePlastic (PCB housing)\u003c\/td\u003e\n  \u003c\/tr\u003e\n  \u003ctr\u003e\n    \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eCountry of Origin\u003c\/strong\u003e\u003c\/td\u003e\n    \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003eMade in Mainland China\u003c\/td\u003e\n  \u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWhy Choose This Board?\u003c\/h3\u003e\n\u003cp\u003eElevator downtime is costly. Having the right replacement part on hand means faster turnaround for technicians and less disruption for building occupants. This relay and car roof interface board is a trusted solution for professionals who need a reliable, model-specific replacement component.\u003c\/p\u003e\n\n\u003ch3\u003eInstallation Note\u003c\/h3\u003e\n\u003cp\u003eThis component is intended for installation by qualified elevator technicians and service professionals. Always follow local safety codes and the elevator manufacturer's guidelines when replacing control boards. For safety standards and guidance, refer to the OSHA Elevators \u0026amp; Escalators Safety page.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products You May Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1-percent-better-every-day-motivational-canvas-wall-poster-inspirational-quote\"\u003e\"1% Better Every Day\" Motivational Canvas Poster | Wall Art\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/everything-is-figureoutable-sage-green-quote-canvas-wall-art\"\u003e\"Everything Is Figureoutable\" Sage Green Quote Canvas Wall Art\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/en.wikipedia.org\/wiki\/Automotive_aftermarket\" target=\"_blank\" rel=\"noopener\"\u003eAutomotive aftermarket\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: Which elevator models is this relay board compatible with?\u003c\/h4\u003e\n\u003cp\u003eA: This relay board and car roof interface board is specifically designed for BT302\/21KK elevator systems, covering both V4.0 and V4.1 versions. Please verify your existing board's version number before purchasing to ensure compatibility.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Is this a direct replacement part for the original board?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. This component is engineered as a direct replacement to match the OEM specifications of the BT302\/21KK system, allowing for straightforward installation by a qualified elevator technician.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Who should install this elevator control board?\u003c\/h4\u003e\n\u003cp\u003eA: This part should be installed by a licensed or certified elevator technician or service professional. Proper installation ensures safety and compliance with local building and elevator maintenance codes.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Where is this product made?\u003c\/h4\u003e\n\u003cp\u003eA: This product is made in Mainland China.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Which elevator models is this relay board compatible with?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This relay board and car roof interface board is specifically designed for BT302\/21KK elevator systems, covering both V4.0 and V4.1 versions. Please verify your existing board's version number before purchasing to ensure compatibility.\"}}, {\"@type\": \"Question\", \"name\": \"Is this a direct replacement part for the original board?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes. This component is engineered as a direct replacement to match the OEM specifications of the BT302\/21KK system, allowing for straightforward installation by a qualified elevator technician.\"}}, {\"@type\": \"Question\", \"name\": \"Who should install this elevator control board?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This part should be installed by a licensed or certified elevator technician or service professional. 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