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The Progressive Dynamics 5100 Series Automatic Transfer Switch features a quick change circuit board that is easily replaced in the event of a failure with no need to disconnect and install the entire unit. A time delay feature ensures the generator is at a stable level before transfer occurs. Built-in strain reliefs allow the installer to simply push the branch circuit wires inside the unit for connection, eliminating the need to purchase and install seperate strain reliefs for each circuit. Dimensions: 9.25′ L x 7.28′ W x 4.2′ H.