2.19 Rated impulse withstand voltage Uimp Peak value of an impulse voltage at a specified form and polarity under which the switching device can be stressed at specified testing conditions without malfunction and whereas the sparking distance is referred to. The rated impulse withstand voltage of the switching device must meet or exceed the impulse overvoltage (transient overvoltage) that may occur in the circuit the device is operating in. IEC/EN 60947-1; 4.3.1.3 Rated insulation voltage Ui The rated insulation voltage of equipment is the value of voltage to which dielectric tests and creeping distances are referred to. The maximum rated operational voltage by no means can be higher than the rated insulation voltage. IEC/EN 60947-1; 4.3.1.2 Rated making capacity Rated value of current, a switching device can satisfactorily make corresponding to its utilization category. The rated making capacity is stated by reference to the rated operational voltage and rated operational current according to the relevant device norm. IEC/EN 60947-1; 4.3.5.3 Rated operational current Ie Rated current a switching device can carry in uninterrupted duty, taking into account rated operational voltage, rated frequency, rated operational mode, utilization category and ambient temperature. IEC/EN 60947-1; 4.3.2.3 Rated operational voltage Ue Voltage of a switching device, which, together with the rated operational current, determins the application of the device and where all the different examinations and utilization categories are referred to. For single pole devices the rated operational voltage is in general the voltage over the pole. For multiple pole devices it is in general stated as chained voltage. IEC/EN 60947-1; 4.3.1.1 Rated short-circuit breaking capacity Icm Short-circuit current a switching device can break at the rated operational voltage and frequency at a defined power factor for AC or a defined response time for DC applications. It is expressed by the maximum peak value of the unaffected current, that such device can break under specified conditions. IEC/EN 60947-1; 4.3.6.3 Rated short-circuit making capacity Icn Short-circuit current a switching device can make at the rated operational voltage and frequency at a defined power factor for AC or a defined response time for DC applications. It is expressed by the maximum peak value of the unaffected current, that such device can make under specified conditions. IEC/EN 60947-1; 4.3.6.2 Rated short-time withstand current Icw Short-time current that a switching device can carry under, in the individual device norm specified, test conditions without being damaged. IEC/EN 60947-1; 4.3.6.1
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