Page 345 - Ferraz semiconductor DIN

Semiconductor fuses
Semiconductor (AC) fuses

®
Other Protistor Fuses
Ferrule Fuses
27x60 URQ/URS/URB - 690 V to 1000 VAC

Peak arc voltage

50 to 200 A URQ 250 A URQ 32 to170 A URB 125-160A URS
1500
Um(V) Um(V) Um(V)
2000
2000 2000 1300

1100
Um (V)
1000
1000 1000 900

700

0 500
0 100 200 300 400 500 600 700 0 100 200 300 400 500 600 700 500 600 700 800 900 1000 200 300 400 500 U (V) 600 700 800
U(V) U(V) U(V)
These curves show peak value Um of arc voltage which appears across the fuse-link as a function of operating voltage U @ cos ϕ = 0.15.

Corrective factor

50 to 200 A URQ 250 A URQ 32 to170 A URB 125-160A URS
K K K
1,2 1,2 1,2
1 1 1
0,8 0,8 0,8
0,6 0,6 0,6
0,4 0,4 0,4
0,2 0,2 0,2
0 200 400 600 0 100 200 300 400 500 600 0 200 400 600 800 1000
U(V) U(V) U(V)
2
Above: Mean curves show variation of total clearing time ( I tt) and total clearing duration tt as a function of operating voltage U.

DC Application data

L
(ms)
R In <= 160 A
80
70
Left: Curves indicate permissible value
60
In <= 200 A of time constant L/r as a function of the
50
DC working voltage
40 In <= 250 A
30
20
10
0
100 200 300 400 500 600
U(V)

SCAC197
12/04