DC Square-body Fuses
Sizes 120- 122 - 2x122
SR 2000V DC
SCDC39
Protistor DC fuses
Protistor DC fuses
12/04
Size 120
SRC from 20 to 215 A
t (s)
I (A)
10 10 2 10 310 210 3 10 4
10 4
10 3
10 2
10
1
10 -1
10 -2
10 -3
10 -4
20 25
32 40
50
63100
160
215
C
C'
10 210 3 10 4
80
125
200
Above, left to right: Curves indicate, for each rated current, pre-arcing time vs. R.M.S. pre-arcing current
a= 130
A2=0.6
B1= 1.25
B2= 0.6
Cf3= 0.8
a= 130
A2=0.6
B1= 1.25
B2= 0.6
Cf3= 0.8
a= 130
A2=0.6
B1= 1.25
B2= 0.6
Cf3= 0.8
DC applications data
Time vs. current characteristics
Electrical characteristics
L/R (ms)
U (V)
1000
1200
1400
1600
1800
2000
2200
2400
90
80
70
60
50
40
30
20
10
0
Above: Curve indicates the maximum permissible value
of time constant L/R as a function of the DC working
voltage
1 : L/R = 45 ms
2 : L/R = 15 ms
Max. AC voltage (50/60 Hz):
1500 V with breaking capacity of 100 kA
Um(V)
U (V)
0
400
800
1200
1600
2000
4000
3500
3000
2500
2000
1500
1000
1
2
Above: Curves indicate for various time constants
L/R the peak arc voltage which may appear across
the fuse terminals, vs. DC working voltage
Peak arc voltage
vs. working voltage