Which difavtomat to choose for the outlet group and electrical appliances?

Good afternoon, Ruslan.

PUE recommends installing an RCD for group lines supplying sockets designed to connect portable power consumers. Portable PUE considers devices that are held by the user during operation: electric drills, lamps, other hand-held power tools. An RCD protecting a person working with a portable power receiver disconnects the line if the insulation of the tool is broken or lowered.

Probably, by the outlet group you mean all the sockets that are used to connect the refrigerator, air conditioning, microwave, and other stationary equipment. RCD protection requires a thoughtful approach. Some protective devices installed in the input shield will save all equipment from overvoltage. Others, installed on "potentially dangerous outgoing lines", can "notice" weakened or broken insulation, which threatens with fire, "feel" that a person has come under stress.

RCD type “A”, as the PUE writes, monitor and respond to damage that causes ripple currents of an alternating or other nature. RCD type "AC", disconnect only alternating currents caused by leaks through broken insulation.

If you need to “promptly” detect abnormal current ripples generated, for example, by a washing machine, put “A”. Ripple currents also affect some dimers, televisions, and computers.

The final conclusion is this: choose an RCD, deciding what it should save from. You can still read this article. I note that the structuring of the power supply scheme of a cottage or apartment facilitates the selection of protection devices.