I'm going to use this 12VDC AC/DC power supply . It is the first time that I am going to use one and I have some questions about over voltage protection and peak current protection. These are the questions:
- The AC / DC internally has a 1A slow blow fuse. Is it necessary to add an external fuse? Maybe something less than 1A to protect the internal fuse?
Regarding the input overvoltage protection, I have thought to use a varactor. The problem is that I do not know to find the information in the datasheet about the maximum input AC voltage. What characteristics should the varactor have: max. continuous voltage, max. clamping voltage and energy rating? I have found this good explanation (How to choose the right Metal Oxide Varistor (MOV)) but I still do not know how to choose the varactor because I can not find all the information in the AC / DC converter datasheet.
About the output overvoltage protection, I have read this parameter in the datasheet: 'Over Voltage Protection (OVP)' -> '125% - 195%, auto recovery'. I do not understand this parameter well. Should I add a TVS diode to guarantee never to exceed 195% of 12VDC?
Below is a circuit diagram to clarify: