A \(69-\mathrm{kV}\) circuit breaker has a voltage range factor \(\mathrm{K}=1.21\), a continuous current rating of \(1200 \mathrm{~A}\), and a rated short-circuit current of \(19,000 \mathrm{~A}\) at the maximum rated voltage of \(72.5 \mathrm{kV}\). Determine the maximum symmetrical interrupting capability of the breaker. Also, explain its significance at lower operating voltages.