Five terminal fully sealed automotive relay is capable of switching up to 50 amps.  Normally closed terminals can switch 30 amps.  Fully sealed design is perfect for for exposure to the elements.  Integrated diode across the coil prevents voltage spikes which can damage sensitive electronic equipment.  The best solution for switching high amperage loads such as head lamps, auxilliary lamps, fog horns, motors, fans, window lifters, air conditioners, heated windows and mirrors, and a myriad of other equipment existing on vehicles today.  Perfect for marine use.  12 volt coil.