Answer / raghavendran

power frequency withstand capability of a CB is its
capability to with any over voltage at system frequency for
a definite period of time say 1min.

Impulse frequency withstanding capability is to withstand
the impulsive voltage levels for a predefined period of
time.say 1.2(rise time)/50 microsec(fall time),100KV
say(impulse voltage level)

Answer / ibrahim

the root mean square (r.m.s.) value of sinusoidal power
frequency voltage that the cb can withstand during tests
made under specified conditions and for a specified time

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electrical

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