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Categories of Limit Switches


A limit switch is an electro-mechanical device that have an actuator mechanically linked to a set of contacts. When any object comes into contact with the actuator then device operates the contacts to make or break an electrical connection. Limit switches are used in a various kinds of applications and environments because of their ruggedness, simple visible operations, ease of installation and operational reliability.
Limit switches are used in an assortment of applications and environments due to their ruggedness, reliability of operation and simplicity of installation.
Limit switches are available in a variety of rotary arm styles, body, operation requirements, and environmental factors including moisture, contamination, temperature, shock and vibration. Other factors to consider when choosing a limit switch include operating force, reset force, over-travel, pre-travel, along with safety requirements. Limit switches are also available in four unique different categories: Global, Medium-duty, Heavy-duty and Safety Locking an Unlocking Styles.

Global limit Switches :
The Global Limit switches is designed to IEC standards for world-wide acceptance of this type of limit switch. These plastic or metal switches are available with a wide variety of actuators, electrical specifications, terminations, circuitry and sealing ratings.
Application of Global limit switches includes:
Injection molding machinery, PLC interface, machine tool equipment, elevators, escalators and moving stairs, gaming machines, material handling, packaging and textile equipment, food and beverage, scissor and platform lifts, industrial doors,  electronic assembly equipment.
Medium Duty limit switches :
Medium-duty limit switches can be divided as application-proven enclosed switches (precision snap-acting switches sealed in rugged metal housing). These medium duty limit switches are available with a variety of actuators, electrical specifications, terminations, circuitry and sealing ratings.

Application of Medium Duty limit switches includes:
Presence/absence detection where physical contact with any object is permitable, as well as applications requiring accurate repeatability and long life such as those found in overhead cranes and hoists, packaging and earth moving equipment, conveyors, stamping machines, surface transportation and textile machinery, printing equipment and farm machinery.

Heavy Duty limit switches :
Housed in a rugged, die-cast body, the limit switch is epoxy coated for protection and this limit switches offers a wide choice of mounting and actuator options. Low temperature and fluorocarbon (high temperature) structure, as well as factory-sealed, pre-wired versions, are available.

Application of Heavy duty limit switches includes:
Presence/absence detection in harsh duty environments where physical contact with any object is permissible such as food and beverage machinery, shipboard and dockside applications, caustic waste handling, power generating plants, welding machinery, pulp and paper equipment,  automotive machine tools and conveyors.
Heavy Duty Limit switches are used to protect personnel and equipment by monitoring the position of movable components.
Application of Safety Locking and Unlocking limit switches include:
Machine tool, robots, wood working, material handling, plastic injection, baling machines, and packaging.
Safety limit switches are available in Key-operated interlock, Hinged guard, Emergency stop cable-operated, Solenoid locking.


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