How does a plunger limit switch work?

**How does a plunger limit switch work?**.

A plunger limit switch is a type of switch commonly used in mechanical and industrial applications to detect the presence or position of an object within a defined range. It consists of a housing, a plunger, and electrical contacts. The operation of a plunger limit switch is based on the movement of its plunger.

**Step 1: Installation**.

The plunger limit switch is typically installed in a fixed position with its plunger extending outwards. When an object comes into contact with the plunger, it triggers the switch to change its state.

**Step 2: Contact arrangement**.

Inside the housing of the plunger limit switch, there are electrical contacts that are normally open or closed. When the plunger is not activated, the contacts maintain their default state. When the plunger is pressed in, the contacts change their state.

**Step 3: Mechanical action**.

As the plunger is pressed in by the external object, it compresses a spring inside the switch housing. This compression causes the electrical contacts to either open or close, depending on their default configuration.

**Step 4: Electrical signal**.

When the contacts change their state, an electrical signal is sent to the connected circuit or device. This signal can be used to initiate a specific action, such as stopping a machine, activating an alarm, or triggering a response in an automated system.

**Step 5: Limiting function**.

The plunger limit switch is designed to operate within a specific range of motion. Once the plunger reaches its maximum travel distance, it cannot be activated any further. This provides a “limiting” function to prevent damage to the switch or the object being detected.

**Conclusion**.

In summary, a plunger limit switch works by using the movement of its plunger to change the state of its electrical contacts, which then sends a signal to a connected circuit or device. Its limiting function ensures that it operates within a defined range, making it an essential component in various industrial and mechanical applications.

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