The Komatsu 3EB5521761 is a genuine OEM ignition lock switch designed for a wide range of Komatsu heavy machinery. This essential component ensures reliable starting and operation for excavators including the PC200-8, PC210-8, PC220-8, PC240-8, PC270-8, PC300-8, PC350-8, PC400-8, and PC450-8 models. It also fits WA380-6, WA430-6, WA470-6 wheel loaders, GD555-5, GD655-5 motor graders, and D61EX-15, D61PX-15 dozers. It provides secure control over the machine's electrical system for starting and accessory functions.