I-T-E "Vacu-Break" Fusible Panelboard Switches have been of consistant design for many years. These Switches can be found labelled I-T-E, I-T-E Imperial, I-T-E Gould, I-T-E Siemens-Allis and current as Siemens. These are Bolt-in design and require separate bus connection hardware. Hardware is often included with the item you are purchasing. Consult with our sales staff to be sure hardware has been addressed.