Discussion
The voltage that appears across the contacts after the circuit breaker is opened is called :
Answer: B
It is called the recovery voltage.
When a circuit breaker interrupts a fault, the arc is extinguished at a current zero, and the system voltage then reappears across the open contacts. The power-frequency voltage that appears across the contacts after final arc extinction is the recovery voltage; the high-frequency transient that rides on it immediately after interruption is the restriking voltage.
Arc voltage is the drop across the arc while it is still burning, before interruption. A surge voltage is a transient from lightning or switching, not the steady voltage across open contacts, and 'break open voltage' is not a standard term.
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