В самолётных автоматах такое нормируется. Вот например для Klixon TC гарантируется правильный порядок выбивания при условии что разница номиналов как минимум два раза: " The 2, 3, 6 and 9TC breaker ratings are coordinated so any rating will trip before another circuit breaker, twice its rating, in the event of a fault of up to 6000 amps let-thru current. This results in improved overall equipment performance, since only the smallest faulted circuit is interrupted, while larger circuits remain operational (see pages 6 and 7 for 6/9TC details). " Но и стоит соответственно, и токи небольшие.
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momijizukamori
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Date: 5 Jun 2016 00:50 (UTC)"
The 2, 3, 6 and 9TC breaker ratings are coordinated so any rating will trip before another circuit breaker, twice its rating, in the event of a fault of up to 6000 amps let-thru current.
This results in improved overall equipment performance, since only the smallest faulted circuit is interrupted, while larger circuits remain operational (see pages 6 and 7 for 6/9TC details).
"
Но и стоит соответственно, и токи небольшие.