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When will a 32 amp mcb trip?

Updated: 6/7/2024
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11y ago

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The circuit protected by a 32 amp circuit breaker will trip when the circuit loading reaches on or about 32 amps.

Theoretically a 32 amp breaker will not trip until current exceeds 32 amps. But this is affected by actual conditions such as ambient temperature, the integrity of the termination, the temperature of the breakers immediately adjacent to it, etc. In the United States the NEC requires that you not knowing load a breaker to greater than 80% of its rating. This avoids what is called nuisance tripping.

Most common MCBs have an inverse-time component. This means the higher the current the faster it will trip. A current of 100 amps caused by a short circuit will trip faster than 33 amps which would most likely be an overload condition. The difference may not be noticeable without testing equipment.

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3w ago

A 32 amp MCB will trip when the current exceeds 32 amperes continuously for a period of time. The exact time it takes to trip will depend on the amount of current above the rated value and the characteristics of the specific MCB.

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