Snap Action Switch Work: Mechanism and Applications.

David M.Blass

The miniature snap action switch, known as a micro switch, is actuated by relatively little physical force. It works by tipping a pivot point and is sometimes referred to as an "over-center" mechanism. Read on to learn more about this switch. This article will review the mechanisms involved, how they operate, and how reliable they are. You will be amazed at how simple they are! This article is intended to be a quick reference for how these types of switches work.

Snap-Action Switch with 16.3mm Roller Lever: 3-Pin, SPDT, 5A - Proto-PIC


A snap action switch's electrical resistance is defined by the pressure exerted between its contacts. A standard IEC 512-4c/4d defines this contact resistance. The IEC 512-4c/4d specifies the tests that determine the level of the switch's resistance and its capacity to withstand solid decelerations and accelerations. This article explores the mechanism of the snap action switch and how to determine if this switch meets your requirements.

Snap action switches are designed for AC operation. They do not have an arc absorber, and their contact gap is relatively small. They are best for applications involving low switching voltage and current. The curved spring provides the upward force needed to initiate the switch action. Despite their small size, these switches are susceptible to shocks and vibrations. It is also best in low-voltage applications. The actuator may not move during the changeover.

Types of Snap Action Switches:

Snap-action switch - All industrial manufacturers

There are two main types of snap action switches. The toggle switch is an electronic micro switch, while a snap-action switch is a miniature version that operates using a tipping point mechanism. It has multiple approvals, including UL, ENEC, TUV, 3C, and CQC. The switch is made of environmentally friendly materials, and its production is REACH-compliant. In addition, it has an IP67 protection grade and a long service life.

The snap action switch is a mechanical switch that sends a rapid transfer of contacts. Several types of snap action switches are available, including miniature models and IP-rated switches. A snap action switch's versatility is unparalleled, and TE offers a complete line of switches and actuators. To find the best fit for your application, you need to consider the size and type of your switch. This article explores the types of snap action switches and how they function.

Contact welding failures:

A snap action switch is an excellent option to prevent contact welding. The spring mechanism reduces contact wear and damage by reducing arcing. However, high switching speeds can cause bouncing, leading to marked wear and contact welding, which may make the circuit unable to open. High switching speeds are also associated with a higher risk of electric shocks. This article will discuss the most common causes of contact welding failures and how to prevent them.

Failure modes:

A high-quality, reliable snap action switch should provide a life cycle of 10 to 20 million electrical and mechanical cycles before failure occurs. This reliability can reduce the cost of switch replacement since replacing a failed switch is often cheaper than buying a new one. However, the price difference between a good quality snap action switch and a cheap one is often only pennies. Designers should also consider the total cost of ownership, including the switch's cost and any repairs or replacements that occur.

The operating force and rated current are essential for any snap action switch. A snap-action switch should provide enough force to activate when it detects a specific condition. A good snap-action switch can operate at a high voltage and provide good contact. Sometimes, a snap action switch fits with a solenoid for high-current switching applications. But it is essential to consider all these aspects before purchasing a snap-action switch.

Global Electrical Requirements:

Ensure that the switch meets global electrical requirements. These include UL and cUL in the United States, CSA in Canada, ENEC in Europe, and CQC in China. If you do not have any prior experience with snap-action switches, consider starting with an essential line of these devices. These products are available in various configurations and electrical ratings. In addition to that, designers can select from these lines when creating their custom snap-action switches.

Despite its high sensitivity, the Snap Action Switch can fail for various reasons. Some of these failure modes are listed below. Several of them involve excessive force or improper installation. The switch has the excessive force and could be subjected to a severe shock or vibration. As a result, the switch may become unstable and not function properly. The best way to avoid this is to ensure that the switch is installed on a flat surface correctly.


A snap action switch is an essential building block for almost any application. It can either be open or closed, with no in between. However, reliability isn't the only factor in choosing the right switch. Some factors affect the success of your application, such as the type of switch you choose and the vendor you select. Consider the following factors to determine whether a snap action switch will work for your application.

It is essential to use a switch with high reliability, especially one that can withstand harsh environments. This is particularly true for high-voltage applications, such as electrical appliances. Switches with high reliability should have a higher current rating than those without to ensure long life. Moreover, a snap-action switch can provide more than a decade of reliable service. Regardless of its reliability, it is a good choice for critical control applications.

Operating Force:

The operating force of a snap action switch is a function of the actuator. It should be selected with care. A stroke too close to the operating point can damage the actuator, resulting in an unstable contact. The mounting plate and driving mechanism can be adjusted to ensure proper operation. The figure at the right shows a typical illustration of the activation force. The contact force decreases near the operating point and increases near the reverse point, but there is also a slight contact bounce before reversal.

Snap action switches should be reliable in a wide variety of environments. High-reliability applications include medical devices, industrial controls, and military equipment. Designers should consider the type of processes suitable for the application, the type of fluids that are present, and the maximum operating temperature for the switch. In addition, environmental requirements are also essential in applications involving safety. Therefore, it's important to consider the operating and ambient temperature ranges when selecting a snap action switch.

Snap Switches with Rapid Opening and Closing | TE Connectivity


To gain insight into the competitive landscape of the snap action switch market, it is imperative to look at key industry statistics. This report focuses on the key factors that drive demand for this product. The report includes historical data for 2010 and projections for 2030, and it also offers comprehensive information about current trends and growth opportunities. In addition to market statistics, it offers a competitive analysis and includes an in-depth discussion of the key market players. In addition, this report includes an extensive section on critical technologies and trends in the snap action switch market.

One primary concern with snap action switches is that their contacts tend to oxidize, resulting in an inertia film. While this may not be a significant issue when a switch is operating under low current, it can lead to damage if the contact fails to break the film. Fortunately, this problem can be addressed by adjusting the mounting plate and driving mechanism. A typical example of activation forces can be seen in the figure above. In the case of AC applications, the force of the contact decreases as the switch is turned on, and the reverse force increases. The contact may bounce before a reversal, resulting in noise or pulse count errors.

In addition to applications, the snap action switch market can be segmented by geography. North America accounts for the largest share of global demand for snap action switches. The United States is the leading region for this product, while Europe is the second largest region. The Asia Pacific, Middle East, and Africa are the fastest-growing regions for the snap action switch market. The report also highlights key industry trends for the snap action switch market. You can access the report via the links below.

David M.Blass
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