Chinese DIN-rail overvoltage, undervoltage and overcurrent protectors

[LeonR]

I've came across some of those on Aliexpress, like these:

https://www.aliexpress.com/item/4000173768389.html
https://www.aliexpress.com/item/33038568196.html
https://www.aliexpress.com/item/4000273878324.html

Are they any good for OVP/UVP? I haven't found a video showing what's inside them.

[LeonR]

No one with hands-on experience with those? I'm interested on using something like that on my circuit breaker box.

[salavat]

I can comment only on TOMZN breaker. I ordered 2 contactors (switching relays), one got installed (25A NO/NC), another is noname current/power/voltage meter.

Voltage meter (however it was after power regulator, which cuts off parts of a sine wave AC signal) was about the same as measured with UNI-T UT210E meter (measured voltage and current).

25A relay is noisy during switch on (never had those type of relays, may be it is normal).

TOMZN was a deliberate choice of the brand since I've seen reviews and inners of their components, which seems to be OK.