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Mechanical limit switches are contact sensing devices widely used for detecting the presence or position of objects in industrial applications.
Limit switches offer high precision in terms of accuracy and repeatability, primarily because they make direct contact with the target to be sensed. When an object contacts the limit switch lever (or plunger) the lever moves a “pre-travel” distance to the “operating point” where the contacts are tripped. Movement of the lever beyond this point is called the “over-travel”. These terms are depicted visually in the diagram below.
The term “limit switch” is derived from the operation of the device itself. As a target object makes contact with the operator of the switch, it moves the actuator to a limit where the electrical contacts of the switch change state.
Deciding which limit switch to purchase and selecting the right one for your application can be a confusing task. However, the decision is important and the successful application of the limit switch depends on the selection of the appropriate technology for the application.
Visit our page to learn how to select the right limit switch.
Limit switches contain the following major components. These may be modular and interchangeable, or can be part of a unitized single-piece switch.
When installing a plug-in switch the user mounts the receptacle to the fixture or machine. The wiring is then brought into the receptacle through the conduit entrance on the bottom of that component. The wires are connected to the terminals in the receptacle. The switch body then plugs into the receptacle and is secured with screws. The operating head is attached to the top of the switch body with screws as well.
Convenience is offered in that the head and switch body components can be quickly and easily replaced in the field without having to rewire the connections to the terminals in the receptacle.
Not sure if Eaton sensor and limit switch solutions are right for you? You can request samples of Eaton sensors FREE OF CHARGE to test them with your machine applications. We will make our Eaton experts available to assist with product selection and provide technical guidance so that you choose the right sensor for your needs.
Eaton's E50 modular plug-in limit switches are the industry standard with versatility of design and high reliability for low maintenance, installation and inventory costs. Standard Viton gaskets, seals and boots and a zinc die -cast enclosure provide are an exceptional industrial applications.
E49 mini metal limit switches are the ideal switches for those who need a cost-effective, compact solution, but do not want to sacrifice durability. The small size, metal body and long mechanical life make the E49 mini metal the perfect switch for machinery OEM applications.
Eaton's E47 precision switches provide high-accuracy switching at an affordable price. A variety of standard features, such as current capacity, operating force, travel characteristics and actuators, lets you custom fit the switch to your application.
