{"product_id":"maretron-cbmd12-12-circuit-mpower-bypass-module","title":"Maretron MPower CBMD12 12-Circuit N2K Bypass Module","description":"\u003cp class=\"nvn-hero\"\u003eThe Maretron MPower CBMD12 is the manual safety net for your NMEA 2000 digital switching system. Twelve Carling Curvette rocker switches let you power every load by hand if the CLMD12 load controller or the N2K network ever drops, so critical circuits stay online no matter what.\u003c\/p\u003e\n\n\u003cdiv class=\"nvn-description\"\u003e\n\u003cp\u003eDigital switching is a beautiful thing right up until the day the network hiccups and you're staring at a dark helm. The \u003cstrong\u003eMaretron MPower CBMD12\u003c\/strong\u003e exists for exactly that day. It's a 12-circuit bypass module that mounts alongside your MPower CLMD12 12-channel DC load controller and gives you a purely manual way to keep power flowing to every load, even if the electronics that normally run the show go offline.\u003c\/p\u003e\n\u003cp\u003eHere's how it works in practice. The CLMD12 handles your automated, network-controlled switching under normal conditions. The CBMD12 sits in parallel as the fallback. Each of its twelve circuits carries its own Carling Curvette rocker switch, so if the CLMD12 malfunctions or the NMEA 2000 backbone loses communication, you flip the switch and that load gets power directly. Bilge pumps, nav lights, electronics, whatever you've wired in stays available. That's the difference between a minor annoyance and a genuine problem offshore.\u003c\/p\u003e\n\u003cp\u003eThe module is rated for 75 amps of maximum current capacity and works on both 12V and 24V DC systems, so it drops into the same installs the rest of the MPower line was built for. Output ratings are staged across the twelve circuits: two outputs handle up to 12A, six outputs handle up to 10A, and four outputs handle up to 5A. You match each load to the appropriate circuit and size its fuse accordingly. Overcurrent protection runs through standard ATC blade fuses, the same kind you already stock on the boat.\u003c\/p\u003e\n\u003cp\u003eWhat sets the Curvette rocker switches apart is that there's no arcing when you manually override a load. On a lot of digital switching products, the manual backup means physically moving a fuse, and every time you do that you're degrading the electrical connection a little more and flirting with an ignition source in a compartment that may not love sparks. The CBMD12 avoids all of that. You're throwing a sealed rocker switch, not yanking hardware.\u003c\/p\u003e\n\u003cp\u003eOne important detail on this particular part number. This is the \u003cstrong\u003eCBMD12\u003c\/strong\u003e, the OEM configuration, which ships without the fuse pack and without the jumper wire. That's deliberate, and it's the right choice for a professional install where the fabricator is already matching fuse ratings to each load's wiring and cutting jumper wire to length. If you want the retail bundle with the fuse pack and jumper wire included, that's the CBMD12-R, a separate part. Buy this version when you or your installer are speccing the fusing and interconnects yourself.\u003c\/p\u003e\n\u003cp\u003eA couple of things the bypass module won't do, so there are no surprises on the bench. It doesn't support paralleled outputs, because each circuit is controlled by its own independent switch. And it doesn't support dimming. If you need dimming or ganged circuits, that's a job for the load controller side of the system under network control, not the manual bypass. The CBMD12's whole job is dead-simple, reliable, hand-operated backup.\u003c\/p\u003e\n\u003cp\u003eFuse selection is where installers earn their keep here. The current rating of the fuse on each load has to protect both the load and the wiring feeding it, so you can't just drop in whatever's in the drawer. Undersize it and you'll nuisance-trip. Oversize it and you've defeated the protection. Because this OEM version doesn't include a fuse pack, plan your ATC fuse values as part of the wiring layout before you power anything up.\u003c\/p\u003e\n\u003cp\u003eThis is Maretron gear, which means it's engineered to live on a boat. The MPower family is built around watertight housings and the kind of corrosion resistance that below-deck marine electronics demand, and the CBMD12 pairs cleanly with the CLMD12 and the rest of the NMEA 2000 digital switching ecosystem. If you're building or servicing an MPower system and you want a manual override you can trust when the network can't help you, this is the module that does it.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul class=\"nvn-features\"\u003e\n  \u003cli\u003e75 amps maximum current capacity across all twelve circuits, rated for both 12V and 24V DC systems\u003c\/li\u003e\n  \u003cli\u003eTwelve independent Carling Curvette rocker switches for hand control of every load\u003c\/li\u003e\n  \u003cli\u003eStaged output ratings: two outputs at 12A max, six at 10A max, four at 5A max\u003c\/li\u003e\n  \u003cli\u003eManual bypass keeps loads powered if the CLMD12 controller or NMEA 2000 network fails\u003c\/li\u003e\n  \u003cli\u003eCurvette switches override loads with no arcing, unlike fuse-pulling backup methods\u003c\/li\u003e\n  \u003cli\u003eOvercurrent protection via standard ATC blade fuses you already stock aboard\u003c\/li\u003e\n  \u003cli\u003eOEM configuration ships without fuse pack or jumper wire for custom professional installs\u003c\/li\u003e\n  \u003cli\u003ePurpose-built to pair with the MPower CLMD12 12-channel DC load controller\u003c\/li\u003e\n  \u003cli\u003eMaretron watertight, corrosion-resistant construction for below-deck marine use\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cdiv class=\"nvn-trust\"\u003e\n  \u003ch2\u003eWhy Buy from NVN Marine\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003eAuthorized Maretron reseller, full manufacturer warranty\u003c\/li\u003e\n    \u003cli\u003eNMEA member and ABYC certified, advice from real boat techs\u003c\/li\u003e\n    \u003cli\u003eSame-day shipping before 3 PM ET on in-stock items\u003c\/li\u003e\n    \u003cli\u003eNY headquarters and Fort Lauderdale flagship retail store\u003c\/li\u003e\n  \u003c\/ul\u003e\n\u003c\/div\u003e\n\n\u003cp class=\"nvn-trust-note\"\u003eGenuine Maretron MPower component, backed by NVN Marine support.\u003c\/p\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"nvn-faq\"\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat does the CBMD12 bypass module actually do?\u003c\/summary\u003e\n    \u003cp\u003eIt gives you a manual way to power each of twelve loads by hand. If your MPower CLMD12 load controller malfunctions or the NMEA 2000 network drops communication, you flip the corresponding Curvette rocker switch and that circuit gets power directly, keeping critical loads online.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eDoes this version include the fuse pack and jumper wire?\u003c\/summary\u003e\n    \u003cp\u003eNo. This is the CBMD12 OEM configuration, which ships without the fuse pack and without the jumper wire. If you want those included, look for the CBMD12-R retail version instead. Buy this one when your installer is speccing the fusing and interconnects.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat's the maximum current capacity?\u003c\/summary\u003e\n    \u003cp\u003e75 amps maximum across the module. Individual outputs are staged: two outputs handle up to 12A, six outputs up to 10A, and four outputs up to 5A. Match each load to a circuit rated for it.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eDoes it work on both 12V and 24V systems?\u003c\/summary\u003e\n    \u003cp\u003eYes. The CBMD12 is rated for both 12V and 24V DC power systems, so it fits the same installs as the rest of the MPower digital switching line.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat kind of fuses does it use?\u003c\/summary\u003e\n    \u003cp\u003eStandard ATC blade fuses for overcurrent protection. You choose each fuse rating to protect both the load and the wiring feeding it. Because this OEM version has no fuse pack, plan those values as part of your wiring layout.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhy rocker switches instead of pulling a fuse?\u003c\/summary\u003e\n    \u003cp\u003eThe Carling Curvette rocker switches override a load with no arcing. Fuse-pulling backup methods degrade electrical connections over time and can create an ignition source. Throwing a sealed rocker switch avoids both problems.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eCan it dim circuits or run paralleled outputs?\u003c\/summary\u003e\n    \u003cp\u003eNo on both counts. The bypass module doesn't support dimming, and it doesn't support paralleled outputs because each circuit is controlled by its own independent switch. Those functions live on the load controller side under network control.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eDo I need the CLMD12 to use this?\u003c\/summary\u003e\n    \u003cp\u003eYes. The CBMD12 is designed to be installed in conjunction with the MPower CLMD12 12-channel DC load controller. It's the manual bypass for that controller, not a standalone switching panel.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eIs this a genuine Maretron part?\u003c\/summary\u003e\n    \u003cp\u003eYes. This is a genuine Maretron MPower CBMD12, built with the watertight, corrosion-resistant construction Maretron uses across its marine electronics line.\u003c\/p\u003e\n  \u003c\/details\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable class=\"nvn-specs\"\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003cth\u003eTitle\u003c\/th\u003e\n\u003ctd\u003eMaretron M-Power CBMD12 Bypass Module 12 Circuit N2K without Fuse Pack and Jumper Wire\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eMaretron\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eManufacturer Part Number\u003c\/th\u003e\n\u003ctd\u003eCBMD12\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eUPC\u003c\/th\u003e\n\u003ctd\u003e873804004112\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd\u003e1.84 lb\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eMaximum Current Capacity\u003c\/th\u003e\n\u003ctd\u003e75 Amps\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eNumber of Circuits\u003c\/th\u003e\n\u003ctd\u003e12\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eCompatible Systems\u003c\/th\u003e\n\u003ctd\u003e12V and 24V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eOutput Ratings\u003c\/th\u003e\n\u003ctd\u003e12A Max (two outputs), 10A Max (six outputs), 5A Max (four outputs)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eSwitch Type\u003c\/th\u003e\n\u003ctd\u003eCarling Curvette Rocker Switches\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eOvercurrent Protection\u003c\/th\u003e\n\u003ctd\u003eStandard ATC fuses\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eNetwork\u003c\/th\u003e\n\u003ctd\u003eNMEA 2000\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eControl Method\u003c\/th\u003e\n\u003ctd\u003eManual ON\/OFF bypass\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003ePaired Module\u003c\/th\u003e\n\u003ctd\u003eMPower CLMD12 12-Channel DC Load Controller\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eIncluded Accessories\u003c\/th\u003e\n\u003ctd\u003eNone (OEM version, no fuse pack or jumper wire)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eCategory\u003c\/th\u003e\n\u003ctd\u003eElectrical\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n    \"@context\": \"https:\/\/schema.org\",\n    \"@type\": \"FAQPage\",\n    \"mainEntity\": [\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What does the CBMD12 bypass module actually do?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"It gives you a manual way to power each of twelve loads by hand. If your MPower CLMD12 load controller malfunctions or the NMEA 2000 network drops communication, you flip the corresponding Curvette rocker switch and that circuit gets power directly, keeping critical loads online.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Does this version include the fuse pack and jumper wire?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"No. This is the CBMD12 OEM configuration, which ships without the fuse pack and without the jumper wire. If you want those included, look for the CBMD12-R retail version instead. Buy this one when your installer is speccing the fusing and interconnects.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What's the maximum current capacity?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"75 amps maximum across the module. Individual outputs are staged: two outputs handle up to 12A, six outputs up to 10A, and four outputs up to 5A. Match each load to a circuit rated for it.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Does it work on both 12V and 24V systems?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Yes. The CBMD12 is rated for both 12V and 24V DC power systems, so it fits the same installs as the rest of the MPower digital switching line.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What kind of fuses does it use?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Standard ATC blade fuses for overcurrent protection. You choose each fuse rating to protect both the load and the wiring feeding it. Because this OEM version has no fuse pack, plan those values as part of your wiring layout.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Why rocker switches instead of pulling a fuse?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"The Carling Curvette rocker switches override a load with no arcing. Fuse-pulling backup methods degrade electrical connections over time and can create an ignition source. Throwing a sealed rocker switch avoids both problems.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Can it dim circuits or run paralleled outputs?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"No on both counts. The bypass module doesn't support dimming, and it doesn't support paralleled outputs because each circuit is controlled by its own independent switch. Those functions live on the load controller side under network control.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Do I need the CLMD12 to use this?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Yes. The CBMD12 is designed to be installed in conjunction with the MPower CLMD12 12-channel DC load controller. It's the manual bypass for that controller, not a standalone switching panel.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Is this a genuine Maretron part?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Yes. This is a genuine Maretron MPower CBMD12, built with the watertight, corrosion-resistant construction Maretron uses across its marine electronics line.\"\n            }\n        }\n    ]\n}\n\u003c\/script\u003e\n","brand":"Maretron","offers":[{"title":"Default Title","offer_id":45000707932253,"sku":"1004665","price":208.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0299\/7266\/0317\/files\/107977XL.jpg?v=1788751804","url":"https:\/\/nvnmarine.com\/products\/maretron-cbmd12-12-circuit-mpower-bypass-module","provider":"NVN Marine","version":"1.0","type":"link"}