LV Fuses based on IEC
LV Fuses based on IEC
(OP)
Dear Colleagues,
Does anybody knows if the rated shortcircuit value of the LV fuses is related to:
Symmetrical, peak or what current?
We are trying to understand it because the manufacturer manual says shortcircuit based on IEC 60947-2 (and we have only fuses gG, not fused circuit breakers)however, the protocol of the fuses says based on 60269-1.
And in any case the manufacturer catalogue says "Switching shortcircuit" and gives only one value
but, we do not know if this one correspond to a "initial current" or a "peak current".
I will thank Any comment or suggestion.
Does anybody knows if the rated shortcircuit value of the LV fuses is related to:
Symmetrical, peak or what current?
We are trying to understand it because the manufacturer manual says shortcircuit based on IEC 60947-2 (and we have only fuses gG, not fused circuit breakers)however, the protocol of the fuses says based on 60269-1.
And in any case the manufacturer catalogue says "Switching shortcircuit" and gives only one value
but, we do not know if this one correspond to a "initial current" or a "peak current".
I will thank Any comment or suggestion.






RE: LV Fuses based on IEC
The breaking capacity is stated in symmetrical RMS amps and is quoted at at a defined power factor or, for DC applications, a defined circuit time constant. The power factor or time constant changes depending upon breaking capacity and as the breaking capacity increases the breaking conditions get more severe.