Miniature Circuit Breaker

hi everyone,

i want to know the rule for selecting an MCB/MCCB for a given load i.e. of what rating MCB/MCCB should we select for a given load. say my load is 34 A , then of what exact rating MCB/MCCB should i use? . i know that the selected MCB/MCCB rating should be higher than the load current .

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