___ is the rms value of the total current comprising the AC and DC components of the current in the circuit breaker pole at the instant of contact separation.

• A. Symmetrical breaking current
• B. Symmetrical short circuit current
• C. Making current
• D. Asymmetrical breaking current

Answer: (D)

Symmetrical breaking current:
It is the rms value of a a.c component of the current in the pole at the instant of contact separation.

Asymmetrical breaking current:
It is the rms value of the total current comprising the a.c and d.c components of the current in the pole at the instant of contact separation.