Hi Arun,
In relation to Labelling requirements in Japan , there is a mandatory "Electrical Appliance and Material Safety Law (DENAN)"
In the DENAN, ”Denki Yōhin” is classified into two categories - “Category A” and “Category B”
Category A product : Need to obtain “Certificate of Conformity (CoC) by Registered Conformity Assessment Body (RCAB) = Registered by Japanese Government.
Category B product : Not necessary to get CoC, but there is the obligation to conform to the Technical Requirements stipulated by the Ministerial Ordinance. Self- verification (confirmation) can be done by manufacturer.
There are many other products not being in scope of DENAN Law. And, even if subjecting to DENAN, there are also products being in scope of another regulation, e.g., therapeutic apparatus for households use, microwave oven, etc.
In simple word in order to claim compliance after necessary testing related activities , A PSE logo needs to be applied.