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Understand Limit Switches , Its types, working principles, applications & installation steps. Enhance your system efficiency with these essential components. Datasheets, Competitive Pricing, International Shipping & Secure Online Ordering. OnlineComponents.com is an Authorized Honeywell® Distributor. Limit Switch is a switch operated by the motion of a machine part or presence of an object. They are used for control of a machine, as safety interlocks, or to count objects passing a point. We will start by having a look at what they actually are, how they work, where we use them, and also the different types of limit switches . So let’s get into in, what is a limit switch ? A limit switch is an electro-mechanical device that is operated when an external force is applied to it.