7610120 Amp SI-Series Automatic Charging Relay Allows temporary isolation of house loads from engine circuit during engine cranking to protect sensitive electronicsAutomatically combines battery banks during the charging cycle and isolates under discharge12/24 Volt auto ranging voltage inputWaterproof rated IP67 - temporary immersion for 30 minutesIgnition protected - safe for installation aboard gasoline powered boatsRemote LED output indicates relay state away from ACRLED light indicates when batteries are combinedLED blinks in undervoltage lockout and starting lockoutSupports high-output alternators up to 120 AmperesIncluded with the ADD A BATTERY Dual Circuit SystemAutomatically combines battery banks during the charging cycle and isolates under dischargeIgnition protected - safe for installation aboard gasoline-powered boatsActivates from any charging source - alternators, battery chargers, or solar panelsHermetically sealed contacts / vaporproofSide and bottom knockouts for power cable connectionsClip-on cover protects and insulates terminal connectionsTin-plated copper studs for maximum corrosion resistance7/8" (22.22mm) stud length to accept multiple cable terminals1/4" x 0.031" male quick connect terminals for ground and remote LED and starting interruptWARNING: This product can expose you to chemicals including di(2-ethylhexyl)phthalate (dehp) which is known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.