What should be included in a modern three-phase shield?

Hello everyone! Not so often on my channel I touch on the topic of electricity, but today we'll talk about it. I will show, using the example of a newly assembled panel for a private house with a three-phase input, which modular equipment it makes sense to buy, and what you can save on.

1. Introductory machine.

You can do without an introductory machine in a private house only in one case - if there is one on the pole, and in the house for convenience, in this case, it is better to put a switch, or a load switch of the same rating.

2. Voltage monitoring relay.

In the photo above, this is the largest seven-module device on the top
din rail. Allows you to open the phase when the voltage in the network decreases or increases - it saves modern equipment from breakdowns + it will turn off the power of the whole house when zero burns out.

3. Three-way reversible switch.

A compact switch of the German company Hager is installed in the panel above. It has three positions: power off, generator power, and city power. Allows one click to switch the power source at home in case of an emergency in the city system.

4. Cross module

The most convenient four-level plastic box for distribution and redistribution of the load in phases and zero connection.

5. Differential automatic machines (RCBOs, Diffs)

The dashboard uses ONLY diffs - all sockets will be connected through them. Difs are protection against overload, electric shock and short circuit. Lighting groups will be made on RCD + circuit breakers.

But if the installer offers you expensive solutions such as VAR, UZM, SPD or machines with a time-current characteristic B, I I think you can refuse: the equipment is expensive, its behavior is not always predictable, a larger shield is required (it grows budget). The only exception is an automatic machine with character B: it makes sense to put it on the protection of the line feeding the PMM or the washing machine.