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Limit switches are a contact proximity sensor device that consists of an <a href="/web/c/pneumatics-hydraulics-power-transmission/electric-actuators/" target="_self">actuator</a> mechanically linked to a set of output contacts. When an object comes into contact with the actuator, the device operates the contacts to make or break an electrical connection.Limit Switch MakeupLimit switches are made up of three key components:<ul><li>Actuator Head - The actuator is the part of the switch that makes physical contact with the object. In some limit switches, the actuator is attached to an operating head which translates a rotary, linear, or perpendicular motion to open or close the electrical contacts of the switch.</li><li>Switch Body – The switch body is the component containing the electrical contact mechanism, the contacts within the body open or close the electrical circuit when the actuator is activated.</li><li>Receptacle/Terminals - The component containing the terminal screws or screw/clamp assembly necessary for wiring purposes.</li></ul>Actuator TypesLimit switches are available with a wide range of actuator types. The type of actuator used can be determined by the mounting position, force required and objects to be detected.<ul><li>Rotary Lever - with lever actuators, a cam or plate hits the end of the lever arm which in turn rotates a shaft and operates the contacts in the switch. The rotation may be spring returned (momentary) or maintained.</li><li>Plunger - Plunger types are best where short controlled machine movements are present or where mounting space does not permit a lever type.</li><li>Cat Whisker or Coil Spring – Longer actuators with a coil wire that can be moved/bent in multiple directions. Typically used in conveying applications to count objects as they pass by.</li><li>Forked – Used with maintained contacts, consisting of two roller levers. One roller will trip the switch and when the second is moved to the opposite direction it will reset the switch.</li></ul>

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Limit Switches, Rotary Lever & Plunger Limit Switch | RS

Limit Switches

Shop our range of Omron Limit Switches. Browse our latest Omron Limit Switches offers. Find out more today at RS.

Omron Limit Switches | RS

Omron is a global supplier that helps innovate worldwide manufacturing through expertise in sensing and control technology, Omron offers a wide range of limit switches such as General purpose, high precision, multi-pole switches, and safety limits switches.

Shop our range of Telemecanique Limit Switches. Browse our latest Telemecanique Limit Switches offers. Find out more today at RS.

Telemecanique Limit Switches | RS

Telemechanique now Schneider Electric, is a market leader providing products and services for industrial control and automation. Telemecanique offer a comprehensive line of products with over 25,000 types of sensors, including limit switches, pressure switches, photo-electric, ultrasonic, inductive, and capacitive electronic sensors.

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ABB Limit Switches | RS

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Bartec Limit Switches | RS

Shop our range of Crouzet Limit Switches. Free Delivery Available.

Crouzet Limit Switches | RS

Shop our range of Eaton Limit Switches. Free Delivery Available.

Eaton Limit Switches | RS

Shop our range of Siemens Limit Switches. Free Delivery Available.

Siemens Limit Switches | RS

Shop our range of Steute Limit Switches. Free Delivery Available.

Steute Limit Switches | RS

Shop our range of Honeywell Limit Switches. Browse our latest Honeywell Limit Switches offers. Find out more today at RS.

Honeywell Limit Switches | RS

Honeywell offers a broad range of limit switches including heavy-duty, general-purpose and miniature limit switches. With a wide variety of actuator types, mounting styles, electrical specifications and terminations, Honeywell limit switches offer superior flexibility and performance as standard.<h2>What is a Limit Switch?</h2>A limit switch is essentially a position sensing device commonly used in industrial automation systems. Made up of three key components, a switch body, actuator and contact terminals, they work by making and breaking an electrical connection when an object makes physical contact with the actuator. Limit switches have a wide range of different actuator types designed for different applications including roller lever, roller plunger, hinge lever or lever arm to name a few. <h3>Type of Honeywell Limit Switch</h3>Compact Precision Limit Switches - Series features small metal or plastic package size, side or flange mounting, booted and unsealed actuators, and low-temperature options.General Purpose Limit Switches - Switches feature IEC standards, EN50041 & EN50047 mounting, plug-in/non-plug-in, plastic or metal housings, 3 conduit options, & a range of sealing choices.Heavy-Duty Limit Switches - Three series sealed to NEMA 1, 3, 4, 4X, 6, 6P, 12, 13 and IP65/66/67; Type 316 case stainless steel option and multiple mountings and actuators.Miniature Limit Switches - Series offer compact switch size, booted and unsealed actuators, multiple configurations, and snap-action, positive break contacts.Hazardous Area Limit Switches - For harsh and explosive environments, switch options include non-sparking actuators, captive cover screws, grounding screws, & silver/gold contacts.Specialty Limit Switches - Unique switches for special applications with metal and plastic housings along with various switching characteristics and switch mechanics.<h4>What can a Limit Switch be used for?</h4>With reliability and repeatability as standard, limit switches can be used in a number of applications including material handling, printing machinery, machine tools, agricultural equipment, overhead cranes and hoists, packaging and earth-moving, stamping, conveyors, surface transportation and textile, and printing machinery.

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ABB Limit Switches

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