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Capacitor selection and busbar layout can significantly impact system performance, efficiency, and reliability. At Celem, we’re proud to share our expertise and collaborate with engineers and designers around the world.

Whether you’re launching a new project or refining an existing one, we’re happy to consult with you—sharing insights, practical recommendations, and decades of experience in high-power capacitor applications.

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Derating curves of capacitors

All Celem capacitors feature a derating curve, which illustrates their operating capabilities across different frequencies. In the centre of the curve—typically in the mid-frequency range—the capacitor can operate at full rated reactive power.

As the frequency decreases (moving left on the curve), The impedance of the capacitor increases and more voltage is required to flow a given current. Since the nominal voltage of the capacitor can’t be increased, the current must be limited.

As we move to the right on the derating curve—toward higher frequencies—the current reaches its maximum allowable level. However, since the capacitor’s impedance decreases inversely with frequency, the voltage must be reduced accordingly to maintain the capacitor’s rated power. Operating above the nominal power level will exceed the capacitor’s ability to dissipate heat effectively.