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Cooling and De-ionization

In a circuit breaker, current interruption is achieved when the arc is:
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Answer & Explanation
Correct AnswerB. Cooled and de-ionized

Quick Explanation

Successful interruption requires the arc path to lose conductivity around current zero. Cooling and de-ionization remove energy and charged particles, rapidly increasing dielectric strength between the contacts and preventing arc re-establishment.

Cooling and De-ionization explanatory diagram

Detailed Explanation

Correct Answer

B — Cooled and de-ionized

Explanation

Successful interruption requires the arc path to lose conductivity around current zero. Cooling and de-ionization remove energy and charged particles, rapidly increasing dielectric strength between the contacts and preventing arc re-establishment.

Key Concept

Cooling and De-ionization

Exam Point

Extinguish arc = cool + de-ionize + restore dielectric strength.

Quick Trick

Extinguish arc = cool + de-ionize + restore dielectric strength.

Exam Tip

Extinguish arc = cool + de-ionize + restore dielectric strength.

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