Please call to PurchaseThe 4-Way Redundant Transfer Switch controls your Normal Street-Power with 3 Stand-By Emergency Generators . If any generator fails the next generator in-line will automatically take over. the controls used are one ATS-22 and two ATS-34. Pictured is the 800 Amp 4-Way Redundant Transfer Siwtch that was order by the United Nations for Haiti. Please Call for any inquiries or for purchasing.