The Basics of Limit Switches - Eaton

The Basics of Limit Switches 2 Table of Contents Typical Limit Switch Features and Benefits of Limit Limitations of Limit Limit Switch Limit Switch Actuator/Operating Switch Standard Industrial Actuators and Operating Rotary Lever Typical Plunger Type Electrical Poles, Snap Action vs. Slow Electrical Polarity Single Pole-Double Double Pole-Double Indicating Low Energy Surface Mount Manifold Mounting Side Mounting Special Purpose Limit Neutral Position Two Step Gravity return Guard Cam Design Lever Arm Plunger Type Wobble Stick and Cat Mounting 3 4 4 4 5-7 5 5 5 5 6 8-9 8 8 9 10-1 2 10 10 10 11 11 12 12 12 13-1 4 13 14 14 15-1 6 15 15 15 16 17-1 8 17 18 18 19 20-2 2 3 Presence Sensing is the act of detecting the presence or absence of an object with a contact or non-contact sensing device.

With momentary switches, the contacts return back to their normal state as soon as the actuator is released. In maintained switches, the contacts remain operated even after

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