The ZC9011 Series fan center controls provide low-voltage control of one- and two-speed fan motors and auxiliary circuits in heating, cooling, or heating-cooling applications. Each fan center consists of a 24-V control transformer and a plug-in switching relay mounted on a 4-inch square electrical junction box cover. All line voltage connections are made inside the box with color-coded, pre-stripped leads, the company states. The input voltage is 120 or 208/280V, and the output voltage is 24V, 40VA.