Page 341 - Ferraz semiconductor DIN

Semiconductor fuses
Semiconductor (AC) fuses

®
Other Protistor Fuses
Ferrule Fuses
27x60 URGD - 600 V to 690 VAC

Time vs current characteristics

Tolerance for mean pre-arcing current ± 8%
These curves indicate, for each rated current, pre-arcing time vs. R.M.S. pre-arcing current.

Corrective factor Peak arc voltage
63 to 200A URGD
63 to 200A URGD
K
1,2 Um(V)
2000
1
0,8

0,6
1000
0,4
Left: Mean curves
0,2
showing variation Left: Curves show
of total clearing peak value Um of
0 200 400 600 0 100 200 300 400 500 600 700 arc voltage which
U(V) time
250A URGD (I 2 t ) and the total 250A URGD appears across the
t
clearing duration t t fuse-link as a
K as a function of the function of opera-
1,2 Um(V)
operating voltage ting voltage U @
2000
1 U . cos ϕ = 0.15.
0,8
0,6
1000
0,4

0,2
0 100 200 300 400 500 600 0 100 200 300 400 500 600 700
U(V)

SCAC193
12/04