Yes, I know about those three lines protection.

In MR DIY powerstrip, if there is power surge and all four switches are turned on, only Green socket will be protected from surge while the Blue, Orange and Red sockets will be hit by surge.

In this case, the MOV should be installed as shown below in red line (Point of entry):

This way, all four sockets will be protected from surge coming from Live wire by redirecting surge to Neutral wire out.
I have no idea why the MOV is installed that way protecting only one socket   and still pass SIRIM.

Even the protection voltage also wrong.
Should be 275

Well the truth about surge protection is electrical surges are kinda unpredictable in terms of amplitude (peak to peak volt) or duration (surge time) so designing a perfect surge arrestor is close to impossible. Even industrial surge protector guys such as Emerson etc usually do not offer any sort of guarantee.

In fact some manufacturers put multiple MOVs across the same system in hopes that one of them 'catches' the strike. Theoretically installing a MOV at the 'entrance' is a good industry practice but there is no concrete proof that installing elsewhere along the PCC (Point of common coupling) affects the efficiency of the surge arrestor system.

If you have an expensive equipment, investing in a proper surge arrestor instead of Mr DIY is highly recommended 

Anyway, when 1000V comes along, do you think that small MOV will help?

Industrial surge protection cost thousands of dollars. And most of all, they have good grounding (which also cost thousands to achieve).

Uncle must have failed electronics in college. The MOV is placed in the COMMON ground and neutral point - which is exactly the same as what you mentioned in the later post.

lel these cheapo thing got surge protector? jew so gullible to believe them?

betul la use 471

u wrote 275... the 275 is part number or volt?

where did i write?

in anycase if got one behind the part number, usually is multiplier la.

u got eye sight problem?

come i screen cap for you who wrote 275

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I not sifu la lol. If you paranoid then make a trip to Jln Pasar, buy another MOV with same part number and stick it to the entrance also can.

What makes u consider surge arrestors at the first place? If your lights dim while your neighbours wash their car it's better to check grounding instead