Page 23 - Ferraz semiconductor BS88

Semiconductor fuses
Semiconductor (AC) fuses

®
Other Protistor Fuses
BS88-4 Fuses
000 BS88 - 500 V to 690 VAC

Total clearing I t
2
10 ms (5 ms) 10 ms (2.5 ms) 8 ms (1.8ms) 6.5 ms (1.5 ms) 6 ms (1.3 ms) 4.5 ms (1 ms) 3.5 ms (0.8 ms) 2.5 ms (0.6 ms) 2 ms (0.4 ms) 1.5 ms (0.3 ms) 1 ms (0.2 ms) URB
2
2
I t (A s)
2
2
10 ms (5 ms) 10 ms (2.5 ms) 8 ms (1.8 ms) 7 ms (1.5 ms) 6 ms (1.3 ms) 5 ms (1 ms) 4 ms (0.8 ms) 3 ms (0.6 ms) 2 ms (0.4 ms) 1.5 ms (0.3 ms) 1 ms (0.2 ms) gRB
I t (A s) 10 6
10 5
5
10
315 A
250 A
200 A
10 4 125 A 160 A
4 150 A
100 A 10 125 A
110 A
80 A
100 A
63 A 80 A
10 3 75 A
50 A 3
10
40 A
10 2 10 3 10 4 10 5
32 A Ip (A)
25 A
10 ms (5 ms) 10 ms (2.5 ms) 8 ms (1.8 ms) 7 ms (1.5 ms) 6 ms (1.3 ms) 5 ms (1 ms) 4 ms (0.8 ms) 3 ms (0.6 ms) 2 ms (0.4 ms) URB
10 2 2 2
20 A I t (A s) 1.5 ms (0.3 ms)
10 6
10
2 3 4 5 6
10 10 10 10 10
400 A
(@ 500 V)
Ip (A) 10 5 350 A
Above: Horizontal curves show, for each rated current, maximum
2
2
values of total clearing I t (I t ) as a function of prospective current
t
Ip. @ UN with cos ϕ = 0.15.
Oblique lines indicate total clearing duration Tt, with associated
pre-arcing duration in brackets. 10 4
I t corrective factor
2
K 10 3
2 3 4 5
1.4 10 10 10 10
Ip (A)
1.2
Peak arc voltage
1
0.8
Um (V)
0.6
0.4 1400
0.2 1200 Left: Curve shows peak
value Um of arc voltage
0
0 200 400 500 660 U (V) 1000 which appears across
fuse-link as a function of
800
the operating voltage
U @ cos ϕ = 0.15
600
Above: Mean curves show variation of total
2
clearing time (I tt) and total clearing duration Tt
as a function of operating voltage U.
0 200 400 600 700 U (V)
SCAC216 12/04