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1. Rated capacitance:

The capacitance value for which the capacitor has been

designed and which is usually indicated upon it.

2. Category temperature range:

The range of ambient temperatures for which the capacitor has been designed to operate continuously; This is defined by the temperature limits of the appropriate category.

3. Upper category temperature:

The maximum ambient temperature for which a capacitor has been designed to operate continuously.

4. Lower category temperature:

The minimum ambient temperature for which a capacitor has  been designed to operate continuously.

5. Rated temperature：

The maximum ambient temperature at which rated voltage may be continuously applied.

6. Rated voltage:

The maximum direct voltage or the maximum RMS alternating voltage or peak value of pulse voltage which may be applied continuously to a capacitor at any temperature between the lower category temperature and the rated temperature.

7. Category voltage：

The maximum voltage which may be applied continuously to a capacitor  at its upper category temperature.

8. Temperature derating voltage：

For any temperature between the rated temperature and  the upper category temperature, the temperature derating voltage is the maximum voltage that may be applied continuously to a capacitor.

9. Insulation resistance（IR) / Time constant (t) Insulation resistance (IR) / Time constant (t):

The insulation resistance is the ratio between an applied DC voltage and the resulting leakage current after a minute of charge. It is expressed in MΩ. The time constant is expressed in seconds with the following

formula:

t (s)=lR (MΩ)×CR (μF).

10. Pulse rise time (dv/dt):

The pulse rise time defines the capability of a capacitor to withstand high current peaks due to fast voltage changes. The peak current is defined by the following formula:

lp(A)=C(uF) × dv/dt ( V/μs)

11. Dissipation factor and equivalent series resistance:

The dissipation factor or tangent of loss angle (tan δ) is the power loss of the capacitor divided by the reactive power of the capacitor at a sinusoidal voltage of specified frequency. The equivalent series resistance(ESR) is the resistive part of the equivalent circuit composed of capacitance, series resistance and inductance.