A circuit breaker is an electrical switch designed to automatically stop the flow of current in case of faults like short circuits and overloads.

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They prevent electrical fires 🔥 They protect appliances & machinery 🛠️ They ensure human safety

Why Are Circuit Breakers Important?

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1️⃣ Miniature Circuit Breaker (MCB): Used in households 🏠 2️⃣ Molded Case Circuit Breaker (MCCB): Used in industries 🏭 3️⃣ Air Circuit Breaker (ACB): Used for high current applications ⚙️ 4️⃣ Oil Circuit Breaker (OCB): Uses oil for arc quenching 🛢️ 5️⃣ SF6 Circuit Breaker: Uses Sulfur Hexafluoride gas for insulation 💨

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Types of Circuit Breakers:

When excess current flows, a bimetallic strip bends or an electromagnetic coil trips the breaker The contacts separate, stopping the flow of electricity It prevents damage and must be reset manually or automatically

Working Principle of a Circuit Breaker:

A) MCB B) MCCB C) ACB D) SF6 Circuit Breaker

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Which of the following circuit breakers is best suited for high voltage applications?

Answer: D) SF6 Circuit Breaker Explanation: SF6 circuit breakers are ideal for high voltage applications because they use Sulfur Hexafluoride (SF6) gas, which has superior insulation and arc-quenching properties. This gas reduces the risk of electrical breakdowns and ensures reliable operation in high-voltage systems. SF6 breakers are widely used in power transmission and industrial applications due to their high efficiency, minimal maintenance requirements, and compact design compared to air or oil-based breakers.