While selecting the gas for a circuit breaker, the property of gas that should be considered is its(i) dielectric strength(ii) non-inflammability(iii) non-toxicity

• A. (i) and (iii) only
• B. (i) and (ii) only
• C. (i), (ii) and (iii)
• D. (i) only

Answer: (C)

Properties of gas while selecting circuit breaker,
1. Dielectric strength.
2. Thermal conductivity.
3. Arc quenching.
4. Electrical properties.
5. Chemical properties. Toxicity of arc products.