Is this a common occurance or a one time thing? if it's common the cooktop might not be wired to the supply correctly causing th phases to be unbalanced drawing too much current from one phase instead of both evenly ish. you'd have to meter it out to see but if you aren't knowledgable with electrical stuff get an electrician to check it if it only happened the one time and isn't anymore probably don't need to worry about it
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