{"product_id":"hella-marine-35a-12v-micro-iso-relay-5-pin-spdt","title":"Hella Marine 35A 12V Micro ISO Relay | 5-Pin SPDT","description":"\u003cp class=\"nvn-hero\"\u003eThe Hella Marine 965453801 is a 35 amp, 12 volt micro ISO relay with five blade terminals and single pole double throw contacts. It lets a small switch run a big load, so you can wire bilge pumps, light bars, horns, and accessory circuits without cooking your dash switches. Compact, reliable, and built to Hella Marine's fit-and-forget standard.\u003c\/p\u003e\n\n\u003cdiv class=\"nvn-description\"\u003e\n\u003cp\u003eA relay is one of those parts nobody thinks about until they need one, and then it's the most important thing on the boat. The Hella Marine 965453801 is a 35 amp, 12 volt micro ISO relay with a single pole double throw contact set across five blade terminals. It lets a small switch control a big load, which is exactly what you want when you're wiring bilge pumps, light bars, horns, or any accessory that pulls more current than a dash switch should ever carry.\u003c\/p\u003e\n\u003cp\u003eHere's the simple version. You run a light trigger wire to the coil, and the relay does the heavy lifting on the load side. That keeps the high-current path short and direct, protects your switches, and stops voltage drop from cooking a long run of undersized wire. Because this one is a single pole double throw unit, it gives you both a normally open and a normally closed contact. So you can switch a circuit on when the coil energizes, or flip a load from one path to another. That changeover contact is what sets it apart from a basic on-off relay, and it opens up some clever wiring. Think of a setup that defaults to one circuit and swaps to another when you throw a switch.\u003c\/p\u003e\n\u003cp\u003eThe 35 amp rating gives you real headroom for most 12 volt marine loads. Bilge pumps, wash-down pumps, LED light bars, electric horns, fuel pumps, and accessory circuits all live comfortably under that number. We always tell folks to size the relay above the actual draw of the load, not right at it, so the contacts aren't working at their limit every time they close. Check the current draw stamped on your pump or light, add some margin, and you'll get years out of it. And always fuse the load. The relay switches current, it doesn't protect the circuit.\u003c\/p\u003e\n\u003cp\u003eWhere does one of these actually earn its keep? A classic case is a bilge pump you want to run off both a float switch and a manual override at the helm. The relay lets the float switch trigger the pump without that switch ever carrying the full pump current. Another is a set of spreader lights or a light bar, where the relay carries the amps and your dash switch just sends the signal. Electric horns, macerator pumps, and livewell pumps all follow the same pattern. Any time the load is bigger than the switch wants to handle, a relay belongs in the circuit.\u003c\/p\u003e\n\u003cp\u003eThe micro ISO body is the compact standard you'll find all over modern 12 volt systems. It drops into any matching micro ISO socket or relay holder, which is the cleanest way to mount it. A socket gives you a tidy place to land your wires and lets you swap the relay in seconds if you ever need to, without cutting anything. The five blade terminals plug straight in. If you're building a panel or adding a bank of accessories, these keep the wiring sane behind the dash.\u003c\/p\u003e\n\u003cp\u003eHella Marine builds this stuff to their fit-and-forget standard, which is the whole point of buying a known brand for a part this critical. A relay that chatters or sticks is a headache you don't want three hours offshore. Still, treat it like any electrical component on a boat and give it a protected, dry spot to live. Behind the helm, inside a console, or in a sealed electrical box all work well. Keep it out of the bilge spray and standing water unless it's inside a proper enclosure.\u003c\/p\u003e\n\u003cp\u003eWiring is straightforward if you've done a relay before. The coil terminals take your low-current trigger, and the heavier terminals carry the switched load. Like all ISO micro relays, the terminal layout is marked right on the body, so check the diagram before you land your wires rather than guessing. One thing to know up front. This is a 12 volt DC part. It isn't meant for 24 volt systems or any AC load, so match it to a 12 volt boat. Get the right relay for the job and it just disappears into the background doing its work, which is the best thing a relay can do.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul class=\"nvn-features\"\u003e\n  \u003cli\u003e35 amp contact rating gives real headroom for bilge pumps, light bars, horns, and accessory loads\u003c\/li\u003e\n  \u003cli\u003e12 volt DC coil matched to standard marine electrical systems\u003c\/li\u003e\n  \u003cli\u003eSingle pole double throw (SPDT) contacts provide both normally open and normally closed paths for changeover wiring\u003c\/li\u003e\n  \u003cli\u003e5 blade terminals plug straight into any matching micro ISO socket or relay holder\u003c\/li\u003e\n  \u003cli\u003eMicro ISO form factor is compact and stacks neatly behind the dash or in a panel\u003c\/li\u003e\n  \u003cli\u003eResistor coil suppression helps tame the voltage spike when the coil releases\u003c\/li\u003e\n  \u003cli\u003eLets a low-current switch control a high-current load, protecting your dash switches and wiring\u003c\/li\u003e\n  \u003cli\u003eBuilt to Hella Marine fit-and-forget standard for reliable, long service\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 Hella Marine 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\u003eWhat is the difference between an SPDT relay and a basic on-off relay?\u003c\/summary\u003e\n    \u003cp\u003eAn SPDT, or single pole double throw, relay gives you two output contacts instead of one. There's a normally closed contact that's live when the coil is off, and a normally open contact that goes live when the coil energizes. A basic single-throw relay only switches one circuit on and off. The SPDT changeover lets you flip a load between two paths, which is handy for default-on circuits or swapping between two accessories.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow much current can this relay switch?\u003c\/summary\u003e\n    \u003cp\u003eIt's rated for 35 amps at 12 volts. That covers most common marine loads like bilge pumps, wash-down pumps, LED light bars, horns, and accessory circuits. We'd size it above your actual load draw, not right at it, so the contacts aren't maxed out on every cycle. And always put a fuse on the load, since the relay switches current but doesn't protect the circuit.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWill this fit my relay socket?\u003c\/summary\u003e\n    \u003cp\u003eIt's a micro ISO relay with five blade terminals, so it drops into any standard micro ISO socket or relay holder. Using a socket is the cleanest install. It gives you a tidy spot to land your wires and lets you swap the relay in seconds down the road without cutting anything.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eDoes it come with a socket or wiring pigtail?\u003c\/summary\u003e\n    \u003cp\u003eThis is sold as the relay itself. A matching micro ISO socket or holder is available separately, and we'd recommend one for a clean, serviceable install. Check your existing holder's terminal layout before ordering so everything lines up.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eCan I use it on a 24 volt system?\u003c\/summary\u003e\n    \u003cp\u003eNo. This is a 12 volt DC relay, so match it to a 12 volt boat. It isn't meant for 24 volt systems or any AC load. If you're on 24 volts, you'll want a relay with a 24 volt coil instead.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow do I wire it up?\u003c\/summary\u003e\n    \u003cp\u003eThe coil terminals take your low-current trigger wire, and the heavier terminals carry the switched load. Like all ISO micro relays, the terminal numbers are marked right on the body, so check the diagram printed on the relay before you land your wires. Run the trigger from your switch to the coil, bring your power and load to the switched terminals, and ground the coil.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhere should I mount it on the boat?\u003c\/summary\u003e\n    \u003cp\u003eGive it a protected, dry spot. Behind the helm, inside a console, or in a sealed electrical box all work well. Keep it out of bilge spray and standing water unless it's inside a proper enclosure. A relay that stays dry is a relay that keeps working.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat kind of loads do boaters use this for?\u003c\/summary\u003e\n    \u003cp\u003eAll sorts. Bilge and wash-down pumps, macerator and livewell pumps, LED light bars and spreader lights, electric horns, fuel pumps, and aftermarket accessory circuits. Any time the load pulls more current than a dash switch should carry, a relay like this belongs in the circuit.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat does the resistor on the coil do?\u003c\/summary\u003e\n    \u003cp\u003eIt helps tame the voltage spike that happens when the coil switches off. That spike can be hard on nearby electronics, so the built-in coil suppression is a nice touch on a 12 volt system with sensitive gear sharing the circuit.\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\u003eHella Marine 965453801 35A 12V Micro ISO Relay (SPDT)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eHella Marine\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eManufacturer Part Number\u003c\/th\u003e\n\u003ctd\u003e965453801\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eUPC\u003c\/th\u003e\n\u003ctd\u003e4082300787887\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eRelay Type\u003c\/th\u003e\n\u003ctd\u003eMicro ISO\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eContact Configuration\u003c\/th\u003e\n\u003ctd\u003eSingle Pole-Double Throw (SPDT)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eContact Form\u003c\/th\u003e\n\u003ctd\u003eForm C\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eTerminals\u003c\/th\u003e\n\u003ctd\u003e5 Blade Terminal\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eMounting\u003c\/th\u003e\n\u003ctd\u003ePlug-in blade terminals\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eAmperage Rating\u003c\/th\u003e\n\u003ctd\u003e35 Amp\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eOperating Voltage\u003c\/th\u003e\n\u003ctd\u003e12 Volt\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eCurrent Type\u003c\/th\u003e\n\u003ctd\u003eDC\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eCoil Suppression\u003c\/th\u003e\n\u003ctd\u003eResistor\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 is the difference between an SPDT relay and a basic on-off relay?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"An SPDT, or single pole double throw, relay gives you two output contacts instead of one. 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Like all ISO micro relays, the terminal numbers are marked right on the body, so check the diagram printed on the relay before you land your wires. Run the trigger from your switch to the coil, bring your power and load to the switched terminals, and ground the coil.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Where should I mount it on the boat?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Give it a protected, dry spot. Behind the helm, inside a console, or in a sealed electrical box all work well. Keep it out of bilge spray and standing water unless it's inside a proper enclosure. 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