Testing Lab of Power Supply/ IT / AV Products

Power adapters sold in Japan must comply with the Electrical Appliance and Material Safety Law (DENAN) and obtain PSE certification. This guide explains the PSE certification safety requirements and process specifically for power adapters entering the Japanese market.

PSE Classification for Power Adapters

Power adapters in Japan's DENAN framework are classified as follows:

• AC Adapters (Class P-3 specified products):Require diamond PSE mark with third-party certification by an RCAB (Registered Conformity Assessment Body). This includes wall-mount adapters and desktop adapters with AC input

• USB Power Adapters (non-specified products):Many USB adapters with 5V output can use the round PSE mark under self-declaration, but this classification should be confirmed based on product specifications

Applicable Japanese standards:

J62368-1　Safety requirements for audio/video, IT and communication technology equipment

J55032 / J55035　EMC emission and immunity standards

Appendix 10 (DENAN interpretation)　Specific safety requirements for AC adapters under DENAN

Safety Testing Key Points

Power adapter PSE safety testing focuses on the following areas:

• Voltage rating verification:Japan uses 100V AC / 50Hz (eastern Japan) and 60Hz (western Japan). Adapters must be tested at 100V AC nominal and at overvoltage conditions (115V AC)

• Electric strength test:Primary-secondary insulation must withstand dielectric testing per J62368-1 requirements

• Temperature test:Critical at 100V AC input. Many adapters designed for 220-240V markets run hotter at lower input voltages due to increased current draw. Components must be verified at Japan's 100V AC conditions

• Abnormal operation:Output short circuit, overload, and single-fault conditions must not create fire or electric shock hazards

• Plug configuration:Adapters with integral AC plugs must meet Japan's JIS C 8303 plug blade dimensions (flat parallel blades, 6.3mm wide, 15mm long)

PSE Certification Process for Diamond PSE

For power adapters requiring diamond PSE certification:

1. ①Application to RCAB:Submit application with product documentation

1. ②Type testing:RCAB-designated laboratory conducts safety and EMC testing

1. ③Factory inspection:RCAB conducts initial production condition assessment

1. ④Certificate issuance:RCAB issues the diamond PSE certificate

Timeline: approximately 8-12 weeks. Annual factory inspections are required to maintain certification. GTG Group provides power adapter PSE certification consulting and testing coordination services.

Labeling Requirements

• Diamond PSE mark with RCAB registration number

• Manufacturer name (in Japanese or English)

• Rated voltage (100V AC), rated frequency (50/60Hz), rated output

• Japanese language warnings and safety instructions

This article is AI-assisted and for reference only. It does not constitute any certification commitment or legal advice. Please refer to the latest official regulations.

Contact: 18826804895 | net01@gtggroup.com