Page 29 - Ferraz semiconductor BS88

Semiconductor fuses
Semiconductor (AC) fuses

Other Protistor Fuses
®
BS88-4 Fuses
000, 2.000 BS88Z - 690 VAC

DC Application data
L/R (ms) Um (V) Rated Curve Ipm (A)
current
100 50 a 150
c b a
1400 65 a 200
90 L/R =80 ms
75 a 270
L/R =25 ms
80 1200 85 a 350
90 a 370
70 L/R =10 ms
1000 110 a 500
60 150 a 700
800 180 b 1200
50
200 c 1800
40 600 250 c 2200
280 c 2200
30
400
20 175 a 740
200 200 a 870
10
235 a 1000
0 0 300 a 1400
100 200 300 400 500 600 700 100 200 300 400 500 600 700 U (V) 355 b 2400
0 U (V) 0 325 b 1900
Above: Curves indicate permissible value of time cons- Above: Curves indicate peak arc voltage 400 c 3600
tant L/R as a function of DC working voltage. Um which may appear across fuse termi- 450 c 4400
Curve a: Ratings from 175 to 300 A nals at working voltage U. 500 c 4400
Curve b: Rating 325 A Ipm values give minimum
Curve c: Ratings from 355 to 500 A
DC interrupting current in amps.
Current limitation curves
Below: Curves indicate, for each rating value of peak let-through current Ic as a function of available fault
I (A) current Ip. Ip (A)
C
10 5 (T000) Ic = 2 Ip (T: 2000) Ic = 2 Ip
URC
Ic = 2.5 Ip gRB URD Ic = 2.5 Ip 250-280A URD Ic = 2.5 Ip 500 A
URC
400-450 A
355 A
200 A
300 A
150 A
235 A
10 4 Ic = 2 Ip 180 A 325 A
110 A
200 A
85 A
65 A 90 A 175 A
75 A
50 A
3
10
2
10
2 3 4 5 6 2 3 4 5 6 2 3 4 5 6
10 10 10 10 10 10 10 10 10 1010 10 10 10 10
Time vs current characteristics
t (s) 65 85 110 150 180 250-280 gRB-URC (000) t (s) 175 200 235 300 325 355 400-450 URC (2000)
50 75 90 200 URD (000) 500 URD (2000)
10 4 10 4
gRB
a=130 a= 130
10 3 A2=0.6 10 3 A2=0.67
B1=1.25 B1= 1.25
B2= 0.67
B2=0.6 Left: Curves indicate,
10 2 Cf3=0.8 10 2 Cf3= 0.8 for each rated current,
pre-arcing time vs.
URC-URD R.M.S. pre-arcing cur-
10 a=130 10 rent
A2=0.67
B1=1.25
1 1
B2=0.67
Cf3=0.85
10 -1 10 -1
10 -2 10 -2 Tolerance for mean
pre-arcing current ±
8%.
10 -3 10 -3
10 -4 10 -4
10 10 2 10 3 10 4 I (A) 10 2 10 3 10 4 10 5 I (A)
SCAC221
12/04