Page 332 - Ferraz semiconductor DIN

Semiconductor fuses
Semiconductor (AC) fuses

Other Protistor Fuses
®
Ferrule Fuses

14x51 & 22x58 URC / URD - 600 to 690 VAC

Time vs current characteristics

14x51 URC 14x51 URD 22x58 URD

a = 130 B1 = 1,25
a = 130 B1 = 1,25 a = 130 B1 = 1,25 A2 = 0,6 B2 = 0,6
A2 = 0,6 B2 = 0,6 A2 = 0,6 B2 = 0,6 Cf3 = 0,8
Cf3 = 0,8 Cf3 = 0,8

These curves indicate, for each rated current, pre-arcing time vs. R.M.S. pre-arcing current.
Tolerance for mean pre-arcing current ± 10%
Corrective factor - Peak arc voltage

Corrective factor Peak arc voltage

14x51 URC - URD 14x51 URC - URD

The mean curves show the variation of the This curve shows the peak value Um of the arc voltage which
total clearing I t and the total clearing duration t as a function appears across the fuse-link as a function of the operating voltage
2
t t
of operating voltage U. U @ cos j = 0.15.
22x58 URD 22x58 URD
K
1,2 Um(V)
2000
1
0,8 1600

0,6
1200
0,4
800
0,2
400
0 100 200 300 400 500 600 700
0 100 200 300 400 500 600 700
U(V)
SCAC184 12/04