The Normally Open Tact Switch

A normally open (NO) tact switch, also known as a momentary push button switch, is a type of switch that is open (non-conductive) in its default state and makes a momentary electrical connection when pressed. When the button is not being pressed, the circuit is open, and no electrical current flows. Pressing the button closes the circuit, allowing current to flow momentarily. As soon as the button is released, the circuit returns to its open state.

Here are key features and characteristics of a normally open tact switch:

Momentary Operation:

A normally open tact switch operates in a momentary fashion. It is designed for applications where a temporary electrical connection is needed.

Spring-Loaded Mechanism:

The switch typically includes a spring-loaded mechanism. When the button is pressed, the spring compresses, and when released, the spring returns the button to its original position, breaking the electrical contact.

Normally Open Configuration:

In its resting state (unpressed), the switch is open, and there is no electrical continuity between its terminals. This is the "normally open" configuration.

Versatility:

Normally open tact switches are versatile and find applications in various electronic devices, including keyboards, remote controls, control panels, and other devices where momentary switching is required.

Tactile Feedback:

Tact switches are often designed to provide tactile feedback, allowing users to feel and hear a click when the switch is pressed. This tactile feedback helps users know that the switch has been activated.

Compact Size:

Tact switches are known for their compact size, making them suitable for applications where space is limited.

Low Profile:

Many tact switches have a low profile, allowing them to be used in thin electronic devices.

Solder or PCB Mounting:

Tact switches are available in different mounting options. They can be soldered onto a circuit board (PCB mount) or mounted through holes in a panel or enclosure.

Contact Material:

The contacts inside the switch are typically made of metal or conductive materials to ensure a reliable electrical connection.

Electrical Ratings:

Normally open tact switches have specific electrical ratings, including voltage and current, that should be considered based on the requirements of the application.

It's important to note that the terms "normally open" and "normally closed" refer to the switch's resting state, not the frequency of use. A normally open tact switch can be used for various functions, including triggering events, activating functions, or sending signals in electronic circuits. The specific application will determine whether a normally open or normally closed switch is more suitable.