Blue Sea Systems Automatic Charging Relays (ACRs)<div style="text-align: left;"><strong>[Product Information]</strong><ul><li id="replacementPartsFitmentBullet" class="aok-hidden" data-doesntfitmessage="We're not sure this item fits your " data-fitsmessage="This fits your "><span class="a-list-item"><span id="replacementPartsFitmentBulletInner"><a href="#" class="a-link-normal hsx-rpp-fitment-focus">Enter your model number</a>to make sure this fits.</span></span></li><li><span class="a-list-item"> Si-ACR automatic charging Relay - 12/24V DC 120a </span></li><li><span class="a-list-item"> Automatically combines batteries during charging， isolates batteries when discharging and when Starting engines </span></li><li><span class="a-list-item"> Protects sensitive electronics by temporary isolation of house loads from engine circuit during engine cranking </span></li><li><span class="a-list-item"> Hermetically sealed contacts/vapor proof </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/51uKM7X4wwL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51999EgqBjL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51yIPgoRafL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51n5OF%2BttoL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/51ickjjpKoL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41zSHSZGIAL.jpg" noproxy>