Limit & Proximity Switches

What do limit switches do?

Limit Switches are electromechanical components that are used to detect the presence, absence or position of an object, which means that they can be used to monitor the movement of machinery and ensure that it’s operating within safe limits. As the object contacts the actuator, the switch will automatically trigger an electrical connection to make or break the circuit and send a signal to the machinery control system.

What triggers a limit switch?

Limit Switches are triggered by the movement of a component on a machine that makes contact with the actuator of the limit switch.

These industrial switches are crucial for heavy-duty applications like lifts, conveyor belts 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.

What types of limit switches are available?

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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