{"product_id":"blue-sea-ml-solenoid-24v-500a-remote-battery-switch","title":"Blue Sea Systems ML Solenoid 24V DC 500A with Remote Contura Switch","description":"\u003cp class=\"nvn-hero\"\u003eThe Blue Sea Systems ML Solenoid is a 24V DC, 500 amp battery switch you drive from a remote Contura switch at the helm. It's magnetic latching, so it holds its position with zero current draw once it flips. Great for isolating a house or start bank on trawlers, sailboats, and larger cruisers where the battery lives far from the switch.\u003c\/p\u003e\n\n\u003cdiv class=\"nvn-description\"\u003e\n\u003cp\u003eBlue Sea Systems builds the ML-Series for one job: switching serious DC current from somewhere other than the battery itself. This is the 24 volt, 500 amp solenoid in black, and it's controlled by the SPDT Remote Control Contura switch that comes in the box. Flip the switch at the helm, the solenoid closes, and your house bank or start bank connects. Flip it again and it opens. Simple to use, and rated for the kind of loads that would melt a lesser switch.\u003c\/p\u003e\n\u003cp\u003eThe \"ML\" stands for magnetic latching, and that's the feature that matters most here. Once the solenoid moves to its new position, it stays there with zero hold current. No coil buzzing away drawing amps all day, no heat building up behind the panel. That makes it a smart pick for long-term isolation jobs where the switch might sit closed for weeks, like separating a house bank from a start bank on a cruising sailboat, or killing all power to a boat that's going to sit on the hard for the winter.\u003c\/p\u003e\n\u003cp\u003eBecause this is the solenoid version, there's no manual control lever on the body. It's driven entirely by that remote Contura switch, wired to the coil. That's exactly what you want when the battery lives somewhere awkward, deep in a lazarette, under a settee, or back in the engine room, and you don't want to crawl back there every time you need to cut power. Mount the switch where your hand naturally falls at the helm and run control wire back to the solenoid.\u003c\/p\u003e\n\u003cp\u003eLet's talk wiring, because this is where installs go sideways. At 24 volts and a sustained 500 amps, you need heavy cable. We spec 4\/0 minimum on the main battery lugs for continuous high loads, and honestly on a trawler pulling long hours we'd go up from there. Undersized cable heats up fast and robs you of voltage right when you need it. The main studs take a proper crimped lug and a wrench, not a screwdriver-and-hope connection.\u003c\/p\u003e\n\u003cp\u003eThe control side is lighter but just as important to get right. That coil circuit wants its own fuse, and a lot of installers skip it. Put a 5 amp fuse inline on the control wire feeding the Contura switch. If something shorts in the switch or the wiring, that little fuse saves the coil instead of cooking it. And keep an eye on voltage drop on long control runs. The coil needs a solid 24 volts nominal to latch cleanly, so if you're running control wire a long way, size it up so the solenoid actually throws every time.\u003c\/p\u003e\n\u003cp\u003eA couple of real-world tips from boats we've rigged. If the remote switch is going in a wet locker or an open console that catches spray, pack the terminals with dielectric grease before you button it up. It's the difference between a switch that works in year five and one that gets crusty and intermittent. And if you're switching a big inverter or a bank of chargers, be aware those loads can arc the contacts on close because of the inrush. Pre-charging the circuit or switching before the inverter is fully loaded keeps the silver contacts clean and extends the life of the unit.\u003c\/p\u003e\n\u003cp\u003eMounting the Contura switch is straightforward. It drops into the standard Contura cutout, so it'll sit neatly in a Blue Sea panel or a custom dash. Just make sure you've got enough depth behind the panel for the switch body and the wiring, around 4 inches on a lot of express cruisers and center consoles. Measure before you cut.\u003c\/p\u003e\n\u003cp\u003eWho's this for? Boats running 24 volt systems that need remote, high-amp battery switching they can trust. Trawlers, larger sailboats, sportfishers with big house banks, and any 24 volt lithium setup where you want clean isolation without a parasitic draw. If your system is 12 volt, this isn't your part, Blue Sea makes a 12 volt version of the same solenoid. But for 24 volt at 500 amps, this is the honest, marine-grade answer, and it's built to shrug off the vibration, shock, and salt that kills cheaper switches.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul class=\"nvn-features\"\u003e\n  \u003cli\u003e24V DC rated for a continuous 500 amps, sized for large house and start banks\u003c\/li\u003e\n  \u003cli\u003eMagnetic latching design holds its position with zero hold current, no parasitic draw behind the panel\u003c\/li\u003e\n  \u003cli\u003eIncludes the SPDT Remote Control Contura switch in the ON-ON configuration for helm control\u003c\/li\u003e\n  \u003cli\u003eSolenoid body with no manual lever, driven entirely by the remote switch for clean out-of-sight mounting\u003c\/li\u003e\n  \u003cli\u003eBlack finish with a marine-grade housing built to resist vibration, shock, moisture, and salt spray\u003c\/li\u003e\n  \u003cli\u003eDeutsch DTM control connector for a secure, sealed coil connection\u003c\/li\u003e\n  \u003cli\u003eHeavy main studs accept crimped 4\/0 and larger cable lugs for high-amp runs\u003c\/li\u003e\n  \u003cli\u003eContura switch drops into the standard cutout for Blue Sea panels or a custom dash\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 Blue Sea Systems 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\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003cdiv class=\"nvn-faq\"\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eIs the remote switch included, or do I buy it separately?\u003c\/summary\u003e\n    \u003cp\u003eIt's included. This part ships with the SPDT Remote Control Contura switch in the ON-ON configuration, so you've got everything you need to control the solenoid from the helm. You just supply the cable, lugs, and a control-circuit fuse.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat does the 'ML' in ML-Series mean?\u003c\/summary\u003e\n    \u003cp\u003eMagnetic latching. The solenoid stays in whatever position it was last switched to, open or closed, without drawing any hold current. That's why it's a good choice for long-term battery isolation, there's no parasitic drain sitting behind your panel.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eDoes this model have a manual control lever?\u003c\/summary\u003e\n    \u003cp\u003eNo. This is the solenoid version, controlled only by the included remote Contura switch. If you want a battery switch with an on-body manual override knob, that's a different Blue Sea ML part. This one is designed to mount out of sight and get driven remotely.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat size cable do I need for 500 amps at 24 volts?\u003c\/summary\u003e\n    \u003cp\u003eFor sustained high loads we spec 4\/0 minimum on the main battery connections, and heavier on long runs or continuous-duty boats like trawlers. Undersized cable overheats and drops voltage. Use properly crimped lugs on the studs, not a loose mechanical connection.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eDo I need to fuse the control circuit?\u003c\/summary\u003e\n    \u003cp\u003eYes, and it's the step people skip. Put a 5 amp fuse inline on the control wire feeding the Contura switch. If the switch or wiring shorts, that fuse protects the coil instead of letting it burn out.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWill this work on a 12 volt boat?\u003c\/summary\u003e\n    \u003cp\u003eNo, this is the 24 volt version. Blue Sea makes a 12 volt version of the same solenoid for 12V systems. Match the coil voltage to your system, a 24V coil needs a solid 24 volts to latch reliably.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eCan I use it to switch a big inverter or charger bank?\u003c\/summary\u003e\n    \u003cp\u003eYou can, just mind the inrush. Large capacitive loads can arc the contacts on close. Pre-charging the circuit or switching before the inverter is fully loaded keeps the contacts clean and the unit lasting longer.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhere should I mount the remote switch?\u003c\/summary\u003e\n    \u003cp\u003eAnywhere your hand naturally falls at the helm. It drops into the standard Contura cutout in a Blue Sea panel or a custom dash. Leave about 4 inches of depth behind the panel for the switch body and wiring, and if it's in a spot that catches spray, pack the terminals with dielectric grease.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow much current does it draw once it's switched?\u003c\/summary\u003e\n    \u003cp\u003eEffectively none to hold position. Because it's magnetic latching, the coil only pulls current for the instant it changes state. That's the big advantage over a continuous-duty solenoid that has to stay energized the whole time it's closed.\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\u003eBlue Sea Systems ML Solenoid 24V DC 500A with Remote Contura Switch\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eBlue Sea Systems\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eManufacturer Part Number\u003c\/th\u003e\n\u003ctd\u003e7719100-BSS\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eUPC\u003c\/th\u003e\n\u003ctd\u003e632085771911\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eSeries\u003c\/th\u003e\n\u003ctd\u003eML-Series\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eProduct Type\u003c\/th\u003e\n\u003ctd\u003eRemote Battery Switch Solenoid\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eVoltage\u003c\/th\u003e\n\u003ctd\u003e24V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eContinuous Rating\u003c\/th\u003e\n\u003ctd\u003e500 Amps\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eRelay Type\u003c\/th\u003e\n\u003ctd\u003eMagnetic Latching\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eColor\u003c\/th\u003e\n\u003ctd\u003eBlack\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eIncluded Switch\u003c\/th\u003e\n\u003ctd\u003eSPDT Remote Control Contura Switch\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eSwitch Configuration\u003c\/th\u003e\n\u003ctd\u003eON-ON\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eManual Control\u003c\/th\u003e\n\u003ctd\u003eRemote only, no manual lever\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eControl Connector\u003c\/th\u003e\n\u003ctd\u003eDeutsch DTM\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\": \"Is the remote switch included, or do I buy it separately?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"It's included. This part ships with the SPDT Remote Control Contura switch in the ON-ON configuration, so you've got everything you need to control the solenoid from the helm. You just supply the cable, lugs, and a control-circuit fuse.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What does the 'ML' in ML-Series mean?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Magnetic latching. The solenoid stays in whatever position it was last switched to, open or closed, without drawing any hold current. That's why it's a good choice for long-term battery isolation, there's no parasitic drain sitting behind your panel.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Does this model have a manual control lever?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"No. This is the solenoid version, controlled only by the included remote Contura switch. If you want a battery switch with an on-body manual override knob, that's a different Blue Sea ML part. This one is designed to mount out of sight and get driven remotely.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What size cable do I need for 500 amps at 24 volts?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"For sustained high loads we spec 4\/0 minimum on the main battery connections, and heavier on long runs or continuous-duty boats like trawlers. Undersized cable overheats and drops voltage. Use properly crimped lugs on the studs, not a loose mechanical connection.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Do I need to fuse the control circuit?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Yes, and it's the step people skip. Put a 5 amp fuse inline on the control wire feeding the Contura switch. If the switch or wiring shorts, that fuse protects the coil instead of letting it burn out.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Will this work on a 12 volt boat?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"No, this is the 24 volt version. Blue Sea makes a 12 volt version of the same solenoid for 12V systems. Match the coil voltage to your system, a 24V coil needs a solid 24 volts to latch reliably.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Can I use it to switch a big inverter or charger bank?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"You can, just mind the inrush. Large capacitive loads can arc the contacts on close. Pre-charging the circuit or switching before the inverter is fully loaded keeps the contacts clean and the unit lasting longer.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Where should I mount the remote switch?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Anywhere your hand naturally falls at the helm. It drops into the standard Contura cutout in a Blue Sea panel or a custom dash. Leave about 4 inches of depth behind the panel for the switch body and wiring, and if it's in a spot that catches spray, pack the terminals with dielectric grease.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"How much current does it draw once it's switched?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Effectively none to hold position. Because it's magnetic latching, the coil only pulls current for the instant it changes state. That's the big advantage over a continuous-duty solenoid that has to stay energized the whole time it's closed.\"\n            }\n        }\n    ]\n}\n\u003c\/script\u003e\n","brand":"Blue Sea Systems","offers":[{"title":"Default Title","offer_id":45005267304541,"sku":"2007942","price":194.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0299\/7266\/0317\/files\/ImageServerAPI_3559d823-ee88-4813-9a44-8eaca55bcd68.jpg?v=1788759781","url":"https:\/\/nvnmarine.com\/products\/blue-sea-ml-solenoid-24v-500a-remote-battery-switch","provider":"NVN Marine","version":"1.0","type":"link"}