I initially ordered the Ultima Switch. However, it was defective, and after reading a bit online, it seems many people have the same problem with the Ultima Switch: it doesn't turn the pump off again.
That's why I bought this electromagnetic switch, which does what it's supposed to.
Unfortunately, it wasn't working when I arrived in Martinique... Just bad luck, the 0.9% defective one worked for me, the original one lasted 22 years.