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Limit Switch - Basic Properties, Terminology and Theory

What is a Limit Switch?

Limit Switch is an electro-mechanical device that consists of an actuator mechanically linked to a set of contacts. When an object comes into contact with the actuator, the device operates the contacts to make or break an electrical connection.

Limit switches are used in a variety of applications and environments because of their ruggedness, simple visible operations, ease of installation and operational reliability.
limit switch categories
Limit switches are used in a wide variety of applications and are available in four unique categories:
  • Global - Designed to IEC standard for world-wide acceptance. These metal or plastic switches are available with a wide variety of actuators, electrical specifications, terminations, circuitry and sealing ratings.
    Uses include - Injection molding machinery, PLC interface, machine tool equipment, elevators, escalators and moving stairs, gaming machines, material handling, packaging and textile equipment, food and beverage, industrial doors, scissor and platform lifts, electronic assembly equipment.
  • Medium-duty - Application-proven enclosed switches (precision snap-acting switches sealed in rugged metal housing). Available with a variety of actuators, electrical specifications, terminations, circuitry and sealing ratings.
    Uses include - Presence/absence detection where physical contact with an object is permissible, as well as applications requiring accurate repeatability and long life such as are found in overhead cranes and hoists, packaging and earth moving equipment, stamping machines, conveyors, surface transportation and textile machinery, printing equipment and farm machinery. Sealed versions for washdown applications.
  • Heavy-duty - Housed in a rugged, die-cast body, the switch is epoxy coated for protection. Wide choice of mounting and actuator options. Low temperature and fluorocarbon (high temperature) construction, as well as factory-sealed, pre-wired versions, are available.
    Uses include - Presence/absence detection in harsh duty environments where physical contact with an object is permissible such as food and beverage machinery, shipboard and dockside applications, caustic waste handling, power generating plants, pulp and paper equipment, welding machinery, automotive machine tools and conveyors.
  • Safety locking and unlocking styles - Used to protect personnel and equipment by monitoring the position of movable components.
    Uses include - Machine tool, wood working, robots, material handling, plastic injection, baling machines, packaging.
Safety Limit Switches
Safety Limit Switches are available in:
  • Key-operated interlock
  • Hinged guard
  • Solenoid locking
  • Emergency stop cable-operated
Limit Switches are available in a variety of body, rotary arm styles, operation requirements, environmental factors including moisture, contamination, temperature, shock and vibration. Other factors to consider in making your selection include operating force, reset force, overtravel, pretravel, along with safety requirements. Select from a wide assortment of choices to fit your application.
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