Yes. The MCB offers protection against overloads for currents in the range 1.13In ÷ 1.45In. Since the overload is typically borne by most equipment, the trip is not
instantaneous.

‐ If there is a current of 1.13In, the switch must not trip before 60 minutes (In≤63A) or 120 minutes (In> 63A).
‐ If there is a current of 1.45In the switch must trip within 60 minutes (In≤63A) or 120 minutes (In> 63A).
‐ In case of higher currents the product standard establishes that the MCB has to trip within 60 seconds for a current equal to 2.55In.

Intervention times may appear long but take into account the need to avoid untimely trips due to overload situations that do not last over time.

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