Class I power supplies have an earth-ground connection, whereas a Class II product does not. A Class I product must have two levels of protection between live (primary) parts and the end-user (secondary). The term protection class refers to the level of primary to secondary insulation determining whether a product needs to be protectively earthed to avoid an electric shock. Class I power supplies. . Understanding the differences between Class I, Class II, and Class III power supplies helps engineers and designers choose the right power supply for their projects. Each class is designed with unique characteristics, safety features, and applications in mind. The International Electrotechnical Commission (IEC) has defined three safety classes for power supplies: Class I, Class II, and. . Class 1 and Class 2 power supplies represent two distinct approaches to electrical safety, each with specific design requirements, safety mechanisms, and appropriate applications. Understanding these differences is essential for engineers designing electronic systems, procurement professionals. . Modern electronic devices rely on a steady supply of electrical power to function. Power supplies, also known as power adapters, play a critical role in converting readily available AC mains power or DC battery power to the specific voltage and current requirements of the electronic device. . Choosing between classes of power supply units (PSUs) is one of the most important things an engineer has to do. This choice greatly affects insulation strategy, grounding, compliance testing, and the system's overall reliability. The main distinction between Class I and Class II systems is how. .
