{"product_id":"blue-sea-7615-atd-automatic-timer-disconnect-120a","title":"Blue Sea 7615 ATD Automatic Timer Disconnect","description":"\u003cp class=\"nvn-hero\"\u003eThe Blue Sea Systems 7615 ATD is an automatic timer disconnect that shuts down your DC loads before they drain the battery. Wire it in, set a timer from 15 minutes to 4 hours, and let it protect your starting battery while you're off the boat. Time, low-voltage, or signal-based cutoff, all in one 120-amp unit.\u003c\/p\u003e\n\n\u003cdiv class=\"nvn-description\"\u003e\n\u003cp\u003eEvery boater has done it. You leave a stereo, a bilge light, or an accessory circuit on, walk away, and come back to a battery that won't crank. The Blue Sea Systems 7615 ATD Automatic Timer Disconnect exists to stop exactly that. It's a combined timer and low-voltage disconnect that automatically isolates your DC loads from the battery, so a forgotten switch doesn't leave you stranded at the ramp.\u003c\/p\u003e\n\u003cp\u003eHere's how it works. A 12-volt signal, usually from your ignition or an accessory switch, triggers the internal relay and connects battery power to your devices. When that signal goes away, the built-in timer starts counting down. Once it reaches the preset time, the ATD opens and cuts power. You can set the disconnect anywhere from 15 minutes up to 4 hours, with steps at 5 seconds, 30 minutes, 1 hour, 1.5 hours, and 2 hours in between. That flexibility matters. A livewell pump might need a few minutes after shutdown, while cabin lights might get the full 4-hour window.\u003c\/p\u003e\n\u003cp\u003eBut the timer is only half the story. The 7615 also watches battery voltage. If your bank drops to a low-voltage threshold before the timer runs out, it disconnects early to preserve enough charge to start the engine. You can set that low-voltage cutoff at 11.0, 11.5, or 12.0 volts depending on how conservative you want to be. And if you'd rather run it purely on the ignition signal, you can turn both the timer and voltage options off and let the removal of the 12V signal do the work. Three ways to trigger a disconnect, one unit.\u003c\/p\u003e\n\u003cp\u003eOn the hardware side, this is classic Blue Sea build quality. The main studs are 3\/8-inch by 16 tinned copper, rated for a 120-amp continuous load and 210 amps intermittent for up to 5 minutes. That's enough for most house-bank accessory circuits on boats up to around 30 feet. A clip-on cover insulates the terminal connections, and one-piece stainless flange nuts keep everything torqued down safely at 140 inch-pounds. An integrated LED right on the face tells you the connection status at a glance, so you're never guessing whether the loads are live.\u003c\/p\u003e\n\u003cp\u003eA few install notes from the field. Mount the 7615 close to your battery bank. Long sense-wire runs cause voltage drop, and voltage drop can trigger premature disconnects that'll drive you crazy. Feed the trigger from a switched ignition source, not straight off the battery, or the timer stays active all the time and the unit never really sleeps. And fuse the positive control lead. An unfused install is asking for nuisance trips. None of this is hard, but getting it right the first time saves you a headache.\u003c\/p\u003e\n\u003cp\u003eWiring is straightforward for anyone comfortable with DC work. Size your cables to the load. Blue Sea rates the studs for 1 AWG to meet the full current spec, and they'll accept up to 1\/0 AWG. The input voltage range is 9.5 to 16 volts, and there's a 16-volt over-voltage lockout that protects the unit during charging spikes. In a dual-bank setup, the 7615 pairs naturally with a Blue Sea automatic charging relay for hands-off charge and load management. It's a common combination on boats that run a separate house and start bank.\u003c\/p\u003e\n\u003cp\u003eWho's this for? Anglers who run electronics and livewells off a house battery and want their start battery protected. Cruisers who leave the boat for days and don't want to babysit a switch. Anyone who's been burned by a dead battery after a long weekend. It's not a battery charger and it's not a full battery-management system on its own, but as a set-it-and-forget-it disconnect, the 7615 does one job and does it well. And because it's Blue Sea, you can wire it in and trust it to be there when you need it.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul class=\"nvn-features\"\u003e\n  \u003cli\u003e120A continuous and 210A intermittent (5 min) rating handles most house-bank accessory circuits\u003c\/li\u003e\n  \u003cli\u003eThree trigger modes: timer countdown, low-voltage cutoff, or removal of the 12V signal\u003c\/li\u003e\n  \u003cli\u003eAdjustable disconnect timer from 15 minutes to 4 hours (5 sec, 30 min, 1 hr, 1.5 hr, 2 hr steps)\u003c\/li\u003e\n  \u003cli\u003eSelectable low-voltage disconnect at 11.0V, 11.5V, or 12.0V to preserve starting charge\u003c\/li\u003e\n  \u003cli\u003e3\/8-inch by 16 tinned copper studs accept 1 AWG to 1\/0 AWG cable\u003c\/li\u003e\n  \u003cli\u003eIntegrated LED shows connection status at a glance\u003c\/li\u003e\n  \u003cli\u003eClip-on insulating cover protects terminal connections from accidental shorts\u003c\/li\u003e\n  \u003cli\u003eOne-piece stainless flange nuts torque to 140 in-lb for secure, vibration-proof connections\u003c\/li\u003e\n  \u003cli\u003e16V over-voltage lockout protects the unit during charging spikes\u003c\/li\u003e\n  \u003cli\u003eLow 4mA open-state draw keeps standby current to a minimum\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\u003eWhat does the Blue Sea 7615 ATD actually do?\u003c\/summary\u003e\n    \u003cp\u003eIt automatically disconnects your DC loads from the battery so a forgotten accessory doesn't drain it dead. You get a countdown timer plus a low-voltage cutoff in one 120-amp unit. Set it, walk away, and your starting battery stays protected.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eHow does the disconnect get triggered?\u003c\/summary\u003e\n    \u003cp\u003eThree ways. A timer that counts down after the 12V signal is removed, a low-voltage threshold that trips if the bank drops too far, or simply the removal of the 12V signal itself. You can turn the timer and voltage options on or off to suit your setup.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat timer settings can I choose?\u003c\/summary\u003e\n    \u003cp\u003eThe disconnect time is selectable at 5 seconds, 15 minutes, 30 minutes, 1 hour, 1.5 hours, 2 hours, or 4 hours. Pick the window that fits the load you're protecting.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWill it keep my start battery from going dead?\u003c\/summary\u003e\n    \u003cp\u003eThat's the whole point. If the bank voltage drops to your set threshold of 11.0, 11.5, or 12.0 volts before the timer runs out, the ATD disconnects early to preserve enough charge to crank the engine.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhere should I mount it?\u003c\/summary\u003e\n    \u003cp\u003eClose to the battery bank. Long sense-wire runs cause voltage drop, and that can trigger early disconnects. Keep it near the battery and feed the trigger from a switched ignition source rather than straight off the positive post.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat cable size and fuse does it need?\u003c\/summary\u003e\n    \u003cp\u003eBlue Sea rates the studs for 1 AWG cable to meet the full 120-amp spec, and they'll accept up to 1\/0 AWG. Fuse the positive control lead. An unfused install can cause nuisance trips.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat's the current rating?\u003c\/summary\u003e\n    \u003cp\u003e120 amps continuous and 210 amps intermittent for up to 5 minutes. The operating draw is 175mA closed and just 4mA open, so standby current stays minimal.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eDoes it work with lithium batteries?\u003c\/summary\u003e\n    \u003cp\u003eThe voltage thresholds are set for lead-acid and AGM banks. LiFePO4 has a much flatter discharge curve, so the low-voltage cutoff points are less useful on lithium. You can still run it as a timer-based or signal-based disconnect on a lithium setup, just don't lean on the voltage feature.\u003c\/p\u003e\n  \u003c\/details\u003e\n  \u003cdetails\u003e\n    \u003csummary\u003eWhat's the warranty?\u003c\/summary\u003e\n    \u003cp\u003eFull Blue Sea Systems manufacturer warranty. We're an authorized Blue Sea reseller, so any claim runs through us back to the manufacturer.\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 7615 ATD Automatic Timer Disconnect\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\u003e7615\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eUPC\u003c\/th\u003e\n\u003ctd\u003e632085076153\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eNominal Voltage\u003c\/th\u003e\n\u003ctd\u003e12V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eContinuous Rating\u003c\/th\u003e\n\u003ctd\u003e120A\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eIntermittent Rating\u003c\/th\u003e\n\u003ctd\u003e210A (5 Min)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eAmperage Operating Current\u003c\/th\u003e\n\u003ctd\u003e175mA (closed) \/ 4mA (open)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eDisconnect Time Range\u003c\/th\u003e\n\u003ctd\u003e5 sec, 15 min, 30 min, 1 hr, 1.5 hr, 2 hr, or 4 hr\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eLow Voltage Disconnect\u003c\/th\u003e\n\u003ctd\u003e11.0V, 11.5V, or 12.0V (10 sec)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eCharge Sense Connect\u003c\/th\u003e\n\u003ctd\u003e13.0V (3 sec)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eCharge Sense Disconnect\u003c\/th\u003e\n\u003ctd\u003e12.75V (10 sec)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eInput Voltage Range\u003c\/th\u003e\n\u003ctd\u003e9.5-16V\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eOver Voltage Lockout\u003c\/th\u003e\n\u003ctd\u003e16.0V (5 sec)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eTerminal Stud Size\u003c\/th\u003e\n\u003ctd\u003e3\/8-16 (M10)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eStud Material\u003c\/th\u003e\n\u003ctd\u003eTinned Copper\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eTerminal Stud Torque\u003c\/th\u003e\n\u003ctd\u003e140 in-lb (15.82 Nm)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eCable Size to Meet Ratings\u003c\/th\u003e\n\u003ctd\u003e1 AWG (50mm2)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eMaximum Cable Size\u003c\/th\u003e\n\u003ctd\u003e1\/0 AWG (50mm2)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eTerminal Ring Diameter Clearance\u003c\/th\u003e\n\u003ctd\u003e1.12in (28.45 mm)\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 Blue Sea 7615 ATD actually do?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"It automatically disconnects your DC loads from the battery so a forgotten accessory doesn't drain it dead. You get a countdown timer plus a low-voltage cutoff in one 120-amp unit. Set it, walk away, and your starting battery stays protected.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"How does the disconnect get triggered?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Three ways. A timer that counts down after the 12V signal is removed, a low-voltage threshold that trips if the bank drops too far, or simply the removal of the 12V signal itself. You can turn the timer and voltage options on or off to suit your setup.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What timer settings can I choose?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"The disconnect time is selectable at 5 seconds, 15 minutes, 30 minutes, 1 hour, 1.5 hours, 2 hours, or 4 hours. Pick the window that fits the load you're protecting.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Will it keep my start battery from going dead?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"That's the whole point. If the bank voltage drops to your set threshold of 11.0, 11.5, or 12.0 volts before the timer runs out, the ATD disconnects early to preserve enough charge to crank the engine.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Where should I mount it?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Close to the battery bank. Long sense-wire runs cause voltage drop, and that can trigger early disconnects. Keep it near the battery and feed the trigger from a switched ignition source rather than straight off the positive post.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What cable size and fuse does it need?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Blue Sea rates the studs for 1 AWG cable to meet the full 120-amp spec, and they'll accept up to 1\/0 AWG. Fuse the positive control lead. An unfused install can cause nuisance trips.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What's the current rating?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"120 amps continuous and 210 amps intermittent for up to 5 minutes. The operating draw is 175mA closed and just 4mA open, so standby current stays minimal.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"Does it work with lithium batteries?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"The voltage thresholds are set for lead-acid and AGM banks. LiFePO4 has a much flatter discharge curve, so the low-voltage cutoff points are less useful on lithium. You can still run it as a timer-based or signal-based disconnect on a lithium setup, just don't lean on the voltage feature.\"\n            }\n        },\n        {\n            \"@type\": \"Question\",\n            \"name\": \"What's the warranty?\",\n            \"acceptedAnswer\": {\n                \"@type\": \"Answer\",\n                \"text\": \"Full Blue Sea Systems manufacturer warranty. 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