Is the newest Mod. 1 Spectra Fusible Unit from General Electric. 200A, 3 Phase, 240V, 150HP Maximum. No mounting hardware is needed for bus connections. This is a plug-in type switch. After connecting there are a few screws that fasten to the chassis for positive install. This unit also features a future additional expansion switch option. This is actually one of the easiest switches to install saving on labor and time.