In the world of electrical systems, power supplies come in different types and classifications based on safety standards and performance. Among these, Class 2 power supply units are widely used in residential, commercial, and industrial applications. But what is Class 2 power supply, and why is it important?

This blog explains the definition, characteristics, applications, and compliance guidelines for Class 2 power supplies—helping you choose the right unit for your needs.

What is Class 2 Power Supply?

A Class 2 power supply is defined by the National Electrical Code (NEC) and Underwriters Laboratories (UL) as a power source that limits output to a safe level under both normal and fault conditions. Specifically, a Class 2 circuit is limited to:

• Maximum of 30 volts (V) AC or 60V DC

• Maximum of 100VA (volt-ampere) output power

These limitations make Class 2 power units inherently safe for use in various low-voltage applications, such as LED lighting systems, security devices, and home automation products.

4 Key Features of Class 2 Power Supply

Output Voltage Limitation

The output voltage of a Class 2 power supply is restricted to prevent electrical hazards. This limitation ensures the voltage remains within safe levels, typically not exceeding 60V DC, minimizing the risk of shock or fire.

Output Power Limitation

A Class 2 power supply cannot deliver more than 100VA. This restricted output makes it safer to use with devices that don’t require high power, such as LED lights, sensors, and small appliances.

Safety Considerations

One of the main reasons for using Class 2 power supplies is safety. Because both voltage and power are limited, even in the event of a short circuit or fault, the system remains protected without needing complex circuit protection devices.

No Electrical Hazard

Class 2 circuits are considered safe-to-touch, and often don’t require wiring in conduit or the use of a licensed electrician. This makes them ideal for DIY installations and low-voltage applications in both residential and commercial environments.

4 Key Applications of Class 2 Power Supply

Home Appliances

Many smart home devices and small electronics operate on Class 2 power. These include thermostats, doorbells, and media players.

Security and Safety Systems

Class 2 power units are commonly used in alarm systems, CCTV cameras, and access control systems for safe and reliable operation.

Lighting Systems

The most widespread use is in Class 2 power unit for LED lights. They power LED strips, bulbs, and panels in both indoor and outdoor settings.

Medical Equipment

Certain low-power medical monitoring devices and diagnostic tools use Class 2 power to ensure patient safety and equipment reliability.

How Do I Know if My Power Supply is Class 2?

To determine whether your device is using a Class 2 power supply, check the label on the power adapter or the manufacturer’s specifications. Look for terms like:

• “Class 2 Power Unit”

• UL certification marks (e.g., UL 1310 or UL 60950)

• Output voltage and current ratings not exceeding Class 2 limits

You can also find Class 2 power supply AC DC adaptor options labeled clearly for LED and other low-voltage applications.

What is the Difference Between Class 1, Class 2, and Class 3 Power Supplies?

Class 2 vs Class II Power Supply: What’s the Difference?

Although they sound similar, Class 2 and Class II are very different:

• Class 2 refers to limitations in output voltage and power for safety.

• Class II refers to insulation type (double insulation, no ground wire required).

For a more detailed explanation, check out our dedicated blog post:

👉 Class 2 VS Class II Power Supply: 9 Differences

Conclusion

So, what is a Class 2 power supply used for? From LED lighting to home automation and safety systems, Class 2 power units provide a safe, efficient, and code-compliant power source for many low-voltage devices.

Whether you’re searching for a Class 2 power supply AC DC adaptor or choosing the right Class 2 power unit for LED lights, understanding these standards helps ensure safety, reliability, and compliance in your electrical setup.