I'm selling a Charles Industries "AC Master Controller" (ACMC), model 93-ACMC50I-B. This is the Cadillac of all marine/RV automatic transfer switches. While this model is nominally the 50-amp model, the main contactor is actually rated for 100 amps to accommodate installations with main generators larger than 50 amps. The ACMC has four inputs and two outputs. The main generator input is rated for 100 amps, with a 50-amp rating for the second generator and each of two shore inputs. Each shore/generator is normally routed to its own output (Bus-A or Bus-B) but if only one selector is hot, the two outputs are automatically bridged. This allows the device to effectively be used to select among four inputs to a single output as needed, for example shore, small generator, large generator, and inverter. A more complete description of this unit can be found on the manufacturer's web site, here: http://www.charlesindustries.com/main/ma_acinpcom.html The installation and operation manual for this unit can be found here: http://www.charlesindustries.com/marine_manual/05_19_06_agile_lt_acmc50i_1[1].pdf This unit is fully operational and in excellent condition. We removed it because it was overkill for our boat -- we have only a single generator. One of the dielectric dividers between the main output terminals is cracked and has been repaired with epoxy. This divider does not impact operation and is there to prevent accidental shorting of the terminals during installation. I hesitate to even mention it but I want to be complete. Included are three of the recommended "cord grips," one for each of two input cords and one for the output cord. These items were extra-cost accessories. If I pack the unit for shipping I may need to remove these and pack them separately. New, this system cost over $3,000. It can be yours for a fraction of that price; make me an offer. If you have two generators, and/or two shore connectors, this device can make your life a bit easier. Right now we are cruising New England, with plans to be in DC at the end of October and then heading south for the holidays. You can meet us somewhere along our route, or I can pack and ship it, but it's heavy, probably 80 lbs by the time I am done packing it. Drop me an email if interested or if you have any questions. -Sean m/y Vector lying Plymouth, MA