Semiconductor fuses
Semiconductor (AC) fuses
SCAC212
Other Protistor®Fuses
BS88-4 Fuses
10x51, 17x49, 2X17x49, - 690 VAC
12/04
Times vs current characteristics
URE URS URT
• These curves indicate, for each rated current, the pre-arcing time vs. the R/M.S. pre-arcing current.
• Tolerance for the mean pre-arcing current ± 10%
URE
URS
URT
Corrective factor - Peak arc voltage
* The mean curves show the variation of the total
clearing time (I2tt) and the total clearing duration tt
as a function of operating voltage U
This curve show the peak value Um of the arc voltage
which appears across the fuse link as a function of the ope-
rating voltage U @ cos ϕ = 0.15.
Corrective factor Peak arc voltage
16
20
25
32
35 40
45 50
55 63
75
80
65
75 85
90
110
140 150
160
Corrective
factor
Peak arc
voltage