What is a normal open switch?

What is a Normally Open Switch?

A Normally Open Switch (NO Switch) is a type of switch where the electrical circuit remains open (not connected) in its default state. This means there is no flow of current until the switch is pressed or activated, at which point the circuit closes, allowing current to pass through.

In industrial applications, Normally Open Switches are widely used for controlling power, triggering signals, or activating devices only when required. For example, they are commonly found in start buttons for machinery or lighting controls.

At HBAN Company, our HBGQ Series Normally Open Switch stands out with its innovative anti-vandal design, offering IP65 waterproofing, 50000 mechanical cycles, and a variety of sizes such as 16mm, 19mm, and 22mm mounting holes. This makes it highly reliable and versatile for numerous industrial applications.

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How to Tell if a Contact is Normally Open or Normally Closed?

The simplest way to distinguish between a Normally Open (NO) or Normally Closed (NC) contact is by observing or testing the switch in its default state:

• Normally Open (NO): The circuit is open in the default state, meaning no electrical connection exists. The circuit only closes (and becomes conductive) when the switch is activated.
• Normally Closed (NC): The circuit is closed by default, meaning the electrical connection is active. The circuit opens (disconnects) when the switch is activated.

Quick Testing Tip: Using a multimeter, set it to continuity mode and test the contacts:

• If there is no continuity in the default state, it's a Normally Open Switch.
• If there is continuity in the default state, it's a Normally Closed Switch.

In our product portfolio, both Normally Open and Normally Closed functions are available across multiple series, including the HBGQ Series, as well as HBS1, LA38, and HBY5 Series switches. This versatility ensures that customers can find the perfect solution for their specific needs.

Need help selecting the right switch for your application? Get in touch with us for personalized assistance!

What is the Difference Between NC and NO Switch?

For example, our HBGQ Series Normally Open Switch is ideal for applications requiring momentary activation, such as starting industrial equipment or triggering signals. On the other hand, our HBS1-AGQ Series can support Normally Closed functionality for applications where safety or default active states are critical.

What Does a Push Button Switch Normally Open Do?

A Normally Open Push Button Switch performs a simple but critical function: it closes the circuit only when pressed or activated. Once released, the circuit opens again, stopping the flow of current. This type of switch is widely used in applications requiring momentary contact, such as:

• Industrial Machines: Starting and stopping equipment like conveyor belts or CNC machines.
• Lighting Systems: Temporarily activating lights in industrial or public spaces.
• Alarm Systems: Triggering emergency alarms when pressed.

HBGQ Series: A Perfect Fit for Momentary Control

• Durable Design: With a mechanical lifespan of 50000 cycles, it is built for longevity in demanding environments.
• Customizable Options: Available with flat, high, or domed heads to fit the ergonomic needs of any application.
• High-Quality Materials: Constructed from brass or stainless steel, ensuring high strength and resistance to wear.
• Flexible Connections: Options for pin terminals or screw terminals simplify installation.
• Certified Safety: Fully compliant with CE and UL certifications, ensuring safety and reliability.

Interested in this product? Send us an inquiry today to receive a quote or learn more about our bulk order discounts!