Limit Switches

Limit Switches

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Definition

A Limit Switch is a detection switch which consists of a basic switch in a metal or resin case.
The strong outer case protects the inside of the switch from external forces, moisture, oil, dust and dirt so that it can be used in locations that demand mechanical strength and environmental resistance.

Features

High Mechanical Durability These switches will encounter significant amounts of force and shock, so the case and actuator are constructed from tough materials.
Superior Environmental Resistance We developed a sealed design and materials that can be used even in harsh environments with exposure to moisture, oil, dust, dirt and high or low temperatures.

Limit Switches are used in environments that demand mechanical strength or environmental resistance where normal Basic Switches could not be used.

Models

There are two types of Limit Switches: General-purpose Vertical Types and Horizontal Types, which have superior mechanical strength.
We have a rich lineup of products in a wide variety of sizes so that you can choose the most suitable switches for your application environment.
We even offer switches that provide improvement of particular specification, such as high sealing property or high durability for use in harsh conditions.

  • Large

  • Small

Vertical Types

High sealing property, High shock resistance and High strength

Standard Switches with many variations

Compact and
Low-cost

Compact and
Low-profile with a high sealing property
Horizontal Types

High-shut-off capacity and High durability

High durability at a low price

Compact with high accuracy

Compact with high durability

Light and compact, High durability, High sealing property

Select the best configuration for your applications from a wide variety of external sizes and specifications.

Structures

The main components that make up a Limit Switch are the actuator, cover, bult-in switch and switch case.

1. Actuator

The force and movement received from the detection object are relayed to the built-in switch through the internal plunger.
The major types of actuators are roller lever, plunger and flexible rod.



Roller Lever


Plunger


Flexible Rod

Select the best actuator type based on the shape and movement of the detection object.

2. Cover

Attach the cover after you have wired the external connection cable to the terminal on the built-in switch.
Use rubber packing to seal the connection between the cover and the switch case.

3. Built-in Switch

The built-in switch can instantly turn ON and OFF through its snap-action mechanism.
The external movement or force reverses the movable spring and moves the moving contact from the lower NC contact to the upper NO contact.

4. Switch Case

The case encloses the built-in switch for protection.
Cases are made of metal or resin to increase mechanical strength.
A special connector is attached to the conduit opening on the bottom of the switch case to secure the external connection cable into place and to form a protective seal for the internal components.

Applications Examples

Position Detection for Production Lines

  • Position detection for drive units (such as ones for assembly robots) and workpieces

Position Detection for Industrial Equipment and Devices

  • Open or closed detection for doors and covers on machine tools or semi-conductor manufacturing equipment

Assembly Robots

Machine Tools

Semiconductor Manufacturing Equipment