I needed a SPDT mains rocker switch for a project.
Foolishly, I looked on eBay and found a pack of 5 rated at 6A 250V.
When they arrived I tested them using my trusty Fluke DMM.
One was intermittent and had an ON resistance of 20 Ohms.
The others were also intermittent. The ON resistance varied - sometimes up to 1 or 2 Ohms.
2 Ohms at 6A gives a power dissipation of 72W.
If a switch gets as hot as a 6OW tungsten light bulb, to me that is worrying.
It's a potential fire / safety hazard.
I looked up the manufacturer's website. As you might expect, the switches were made in China.
The spec stated an ON resistance of 35 milliohms max.
Naturally, I have arranged a return & refund. The seller will be receiving negative feedback.
I have ordered some from Farnell that will hopefully operate as specified.
It seems to me that every time I buy something made in China it turns out to be poor quality rubbish.
I had a similar experience with a replacement fan for a NVIDIA 960 GPU card.
The existing sleeve bearing fan became noisy after a couple of years.
It was impossible to find a replacement in the UK, so I ordered one with the same part number from China.
After I fitted it, it lasted just one day before it became as noisy as the original.
The fan design and construction is rubbish.
I have now ordered an alternative fan that uses two ball bearings - again it had to come from China. I could find no alternatives.
I've also had bad experiences with fake ICs from China.
I despair that we have to put up with this.

What has happened to the electronics industry?