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About the Electrical Appliances and Materials Safety Act (PSE)
This page provides a clear explanation of the Electrical Appliance and Material Safety Act (PSE) as it applies to AC/DC power adapters and switching power supplies. Drawing on many years of experience and a proven track record, UNIFIVE has extensive knowledge of PSE and can recommend products that customers can use with confidence.
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What Is the Electrical Appliances and Materials Safety Act (PSE)?
The Electrical Appliances and Materials Safety Act (PSE) came into effect in April 2001, replacing the former Electrical Appliance and Material Control Act. Among electrical Products used in homes, stores, offices, and other locations, Products designated by Cabinet Order as electrical appliances and materials may not be sold unless they display a PSE mark indicating compliance with national technical standards, as well as the business operator's name, rated voltage, rated power consumption, and other required information.
If hazardous Products lacking these markings are distributed in the marketplace, the government may order manufacturers and other business operators to take measures such as recalling them. Products subject to regulation must undergo self-verification of compliance with technical standards. Among these, products considered particularly likely to cause hazards or damage are classified as specified electrical appliances and materials and are required to undergo inspection by a third-party organization.
| Category | Description |
|---|---|
| Specified Electrical Appliances and Materials | Products considered particularly likely to cause hazards or damage. A conformity assessment by a third-party organization (registered conformity assessment body) is required. Diamond-shaped PSE mark. |
| Electrical Appliances and Materials Other Than Specified Electrical Appliances and Materials | Electrical appliances and materials other than those listed above. Compliance with technical standards is verified through Self-inspection. Circular PSE mark. |
PSE Classification of AC/DC Power Adapters
The AC/DC Power Adapter we offer are classified as "DC power supply units" under Specified Electrical Appliances pursuant to the Electrical Appliances and Materials Safety Act. Therefore, they are sold only after undergoing a conformity assessment by a third-party organization (registered conformity assessment body) and displaying the diamond-shaped PSE mark.
Differences Between Extension Cord Sets and Products with Built-in AC/DC Power Adapter
Even electrical appliances that look similar may have different "electrical appliance names" under PSE depending on their intended use, and different technical standards may apply. Based on information published by the Ministry of Economy, Trade and Industry, this section explains the differences between extension cord sets (power strips) and Products with built-in AC/DC Power Adapter.
Extension Cord Sets (Power Strips)
Wiring devices used to supply electricity from a wall outlet to electrical appliances located some distance away are commonly called table taps or power strips, but their electrical appliance name under PSE is "extension cord set." A Products consisting of a power strip with an appliance plug is also treated in its entirety as an "extension cord set."
PSE classification: Electrical appliance classification "Wiring Devices" / Electrical appliance name "Extension Cord Set"
Power Strip with USB Ports = DC Power Supply Unit
A Products consisting of a power strip equipped with USB ports that can be used to charge smartphones is treated as a "DC power supply unit" under PSE. This is the same classification as the AC/DC Power Adapter we provide.
PSE classification: Electrical appliance classification "Alternating Current Electrical Appliances" / Electrical appliance name "DC Power Supply Unit"
| Products | PSE Classification |
|---|---|
| Power strip (outlets only) | Wiring Devices / Extension Cord Set |
| Power strip + appliance plug | Wiring Devices / Extension Cord Set |
| Power strip + USB ports | Alternating Current Electrical Appliances / DC Power Supply Unit |
| AC/DC Power Adapter | Alternating Current Electrical Appliances / DC Power Supply Unit |
Notice to Importers: Importers who import electrical appliances from overseas are required under the Electrical Appliances and Materials Safety Act to ensure that their Products comply with PSE technical standards.
Reference: Information Published by the Ministry of Economy, Trade and Industry
The electrical appliance classifications above are described in detail in the following materials published by the Ministry of Economy, Trade and Industry.
- Extension Cord Sets with Appliance Inlet Plugs (Ministry of Economy, Trade and Industry PDF)
- Treatment of Extension Cord Sets with Built-in AC/DC Power Adapter (Ministry of Economy, Trade and Industry PDF)
Our PSE-Compliant Products
We have many years of experience and a proven track record in obtaining PSE certification under the Electrical Appliances and Materials Safety Act. If you are looking for PSE-compliant AC/DC Power Adapter or switching power supplies, you can find Products on the following page.
Related Pages
For more information about our compliance with safety standards and quality control system, please also see the following pages.
Our Commitment to Quality:
Our Commitment to Quality (Top Page) / Compliance with Global Safety Standards / Quality Control System for Our AC/DC Power Adapter / RoHS 2 Compliance