Discover the versatility of Limit and Proximity switches, essential components in industrial controls.
What do limit switches do?
A Limit Switch is an electromechanical component that is used to detect the presence of an object. As the object contacts the actuator, the switch will cause an electrical connection to make or break. The limit switch then regulates the electrical circuit which controls the machine and the moving parts.
What triggers a limit switch?
Limit Switches are triggered by movement of a component on a machine where it makes contact with the actuator of the limit switch.
These switches are crucial for heavy-duty tasks like lifts and commercial vehicle controls, serving as sensors that record distance, measure temperature, or even protect circuits from exceeding limits.
Limit switches come in various sizes, electrical specifications, and actuator heads, ensuring compatibility with diverse applications. When an object makes contact with the actuator, limit switches can make or break electrical connections effectively.
What are the 5 types of Limit Switches?
1. Whisker
These switches have a long, relatively strong spring-arm actuator which will bend and actuate the switch once sufficient perpendicular force has been applied to it. Whiskers are typically used to monitor the placement and flow of objects on a conveyor/assembly line.
2. Roller
Roller limit switches feature a roller on a stationary shaft that can transfer a radial force of an object to the thrusting force of the plunger. The roller element is used to reduce friction, but it is the plunging movement that actuates the switch.
3. Lever
The limiter on these switches is a lever mounted on a rotating shaft, and the switch will actuate once the lever has rotated around the shaft to a certain limit. Levers have a speedy response time, so they are perfect in systems such as lifts and door entry, etc.
4. Plunger
Plunger limit switches are the most commonly used type, as they are simple, durable, cost-effective and very versatile. They consist of a plunger that actuates the switch when an object pushes on it directly. This means that they require substantially less force to actuate.
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