Page 339 - Ferraz semiconductor DIN

Semiconductor fuses
Semiconductor (AC) fuses

®
Other Protistor Fuses
Ferrule Fuses
27x60 gRB - 800 VAC

2
Total clearing I t
DC Application data
L/R(ms)
Ic (A)
90 1 2 3 Um (V)
10 5
80
110 A 70
100 A 60
10 4 80 A 50
63 A
40 2000
50 A 1
30
40 A
10 3 32 A 20 1000
25 A
20 A 10 2
16 A 0
12 A 0 0
10 2 10 A 0 U (V) 500 U (V)
8 A 100 200 300 400 500 600 700 800 900
1 - L/R = 60 ms / 2 - L/R = 30 ms
Above: Curves indicate permissible value of time cons- Above: Curve indicates peak arc voltage Um
10 1 Ip (A) tant L/R as a function of DC working voltage. which may appear across fuse terminals at
1 2 3 4 5 1 - I N from 80 to 110 A / 2 - I N from 25 to 63 A working voltage U, for different values of time
10 10 10 10 10 3 - I N from 8 to 12 A constant L/R of the fault circuit.
2 2
Above: Horizontal curves show maximum values of total clearing I t (I t ) as function
t
2
of prospective current Ip. @ U .with cosϕ = 0.15. Oblique lines indicate total clea- I t corrective factor
N
ring duration Tt and associated pre-arcing duration in brackets.
K
Current limitation curves Left: Mean curve
shows variation of
Below: Curves show, for each rating, value of peak let-through
I (A) current Ic as a function of available fault current Ip. total clearing time (I 2 t ) t
C
4 and total clearing
10 110 A
100 A duration Tt as a func-
80 A
63 A
50 A tion of operating vol-
40 A
32 A tage U.
25 A
3 20 A
10 16 A
12 A
10 A
8 A

2
10
U (V)
Peak arc voltage
Um(V)
10 1
Left: Curve shows
1 2 3 4 5
10 10 10 10 10 Ip (A) peak value Um of arc
Time vs current characteristics voltage which appears
across the fuse link as a
t (s) 10 16 25 40 63 100 function of oper-ating
10 4 8 12 20 32 50 80 110 voltage U @ cos ϕ =
gRB 0.15
a=130
10 3 A2=0.6
B1=1.25

B2=0.6 Left: Curves show, for
10 2 Cf3=0.8 each rated current, U(V)
pre-arcing time vs. Watts loss
R.M.S. pre-arcing cur-
10 rent. Tolerance for P/P N
mean pre-arcing Left: Curve enables com-

current ± 8%. putation of power losses
1 P for a I -rated fuse as a
N
function of the R.M.S.
current I (as a multiple of
10 -1 I for steady state opera-
N
tion)
10 -2

10 -3 I/I N
10 -4
10 1 10 2 10 3 10 4 I (A)
12/04 SCAC191