Does the UPS protect against power surges and interference when off?

Question

Iron

Hello!
The question is - does the UPS protect against power surges and interference in the off state?
UPS (ippon smart power pro 2000), in addition to battery outputs, it also has two outputs labeled "surge protection" ( www.inline-online.ru/img/goods/137610/48108.jpg ).
When you turn off the UPS button, the power from the outputs from the battery is lost. But in the exits "surge protection" remains. So I’m wondering if it protects everything that is connected through “surge protection” in the off state, or does it only work as a simple socket? Maybe he still needs to be always on in order to process the current voltage and respond in time? Or maybe not. Maybe someone in the know?
Since there was already a sad case, the PowerCom UPS failed to cope with the power surge and the computer burned out. He worked exactly the same way. Maybe the UPS itself was not of very high quality, or maybe the “surge protection” outputs are not able to perform their functions with the UPS turned off, only then it’s not clear why they exist at all?
I did not want to repeat this grief.
Tell me how to be?
PS: It's not worth suggesting to switch everything through the battery outlets, this is the connection method that interests you.

Answer 1

Surge Protection is usually implemented in the same way as the protection in the so-called "network filters", namely, a varistor is connected in parallel, and possibly a choke and a capacitor.
The varistor protects against short-term voltage surges of small energies, absorbing them and converting them into heat. From a crazy electrician who gave two phases, he will not protect.
The inductor absorbs symmetrical pickups on the cable. It is powerless against surges.
The capacitor cuts off high frequency noise. You can also find a fuse. The fuse is not designed to protect electronics (while it works, everything usually has time to blow out), it protects against fire. Total - Surge Protection is similar to connecting equipment to a surge protector. The protection is active all the time.
Another surge protector is a ground arrester. It is effective only when the building has a real grounding (five-wire circuit), which is rare for Russia.