Which relay to choose?

Question

Electronic components

I want to put a relay in the shield to automatically switch to the generator.
3 phase, changeover. It will be controlled by the presence of 220V on the control contact.
The scheme is as follows:
I got confused in the ABB catalog, I can’t understand what an impulse relay means. Tell me which one to order.

Answer 1

IMHO.
A quick look through the catalog shows that the maximum switching current for the 3C/O CR series modular relays is only 10A.
For a current of 20A, I recommend using a circuit with 2 contactors.

Answer 2

An impulse relay is a relay that does not require direct current to hold the contact, but rather one impulse is enough.
If, according to the requirements, this is not necessary (there is a voltage of 220 volts on the winding - the relay has switched, there is no voltage - the relay has returned back), then you need to select a conventional relay.
If the control comes from 220 volts, then you need to take a relay with a winding of 220 volts (as I understand it, alternating voltage or otherwise must be rectified with the appropriate consequences).
Contacts for 20 amps or higher, and the corresponding voltage on them. It is better to take with a margin, of course.

Answer 3

I suppose something like this
www.elimpuls.energoportal.ru/silovoe-rele-kontaktor-63a-4no-4r-3m-uk-230v-04078-8451.html
Pulse is not needed, you need the usual one.

Answer 4

If I understand you correctly, then these relays also have the following names:
1) Russian - on-off (there is a subspecies - polarized). Pulse - the first time I hear.
2) Foreign - Bistable.
And to recommend something ... We use Siemens 7PA22 or 7PA23 in typesetting cabinets . But, there is not a very large breaking capacity.
Question: what voltage do you switch?