Page 11 - Ferraz semiconductor DIN

Semiconductor fuses
Semiconductor (AC) fuses

®
Protistor Square-body Fuses
PSC gR/aR sizes 000/00
gR/aR - 600 to 690 VAC DIN 00

DC Application data
L/R (ms) Um (V)
100 Left: Curves indi- Rated Ipm (A) 1400
90 cate permissible current Curve gRB URB L/R = 80 ms Left: Curves
value of time L/R = 25 ms indicate peak
80 b a constant L/R as a 16 a a 32 32 1200 arc voltage Um
20
40
40
70 function of DC 25 a 50 50 1000 L/R = 10 ms which may
working voltage. 32 a 64 64 appear across
60 40 a 80 80 800 the fuse
50 Curve a: for 50 a 100 100 terminals at
63
ratings a 126 126
40 80 a 160 170 600 working
from 16 to 250 A 100 a 200 220
30 Curve b: for 125 a 250 280 400 voltage U.
160 a 320 390
20 ratings from 315 200 a 510
to 450 A 250 200
10 a 650
315 b 840
0 350 b 1770 0
0 400 b 2040 0
100 200 300 400 500 600 700 800 900 1000 U (V) 450 b 2250 100 200 300 400 500 600 700 800 900 1000 U (V)
Ipm values give
Current limitation curves minimum DC interrupting
current in amps.
Ic = 2 Ip
Ic = 2.5 Ip Ic = 2.5 Ip URB
I (A) Ic = 2 Ip I (A)
C
C
4 160A 10 5
10 100 A 125 A 450A
80 A gRB 400A 350A
63 A 50 A 315A
40 A 32 A 10 4 250A
25 A 200A
20 A 160A 125A
3 16 A 100A
10 80A
63A 50A
10 3 40A 32A
25A
20A
16A
2
10 2
10
10 1 10 1
1 2 3 4 5 6 10 1 10 2 10 3 10 4 10 5 10 6 Ip (A)
10 10 10 10 10 10
Above: Curves show, for each rating, value of peak let-through current Ic as a function of available fault current Ip.
Time vs current characteristics
32 80 160 250 350
20 32 50 80 20 50
t (s) gRB t (s) URB
16 25 40 63 100 125 160 16 25 40 63 100 125 200 315 400 450
10 4 10 4 Left: Curves
a=130 a= 130 indicate, for each
A2=0.6 A2=0.67 rated current,
10 3 B1=1.25 10 3 B1= 1.25 pre-arcing time vs.
B2=0.6 B2= 0.67 R.M.S. pre-arcing
Cf3=0.8 Cf3= 0.8 current
10 2 10 2
C
Tolerance for
10 10 C' mean pre-
arcing current
±8%.
1 1 CC'
10 -1 10 -1
10 -2 10 -2
10 -3 10 -3

10 -4 10 -4
10 10 2 10 3 10 4 I (A) 10 10 2 10 3 10 4 I (A)
SCAC58 12/04