Page 28 - Ferraz semiconductor BS88

Semiconductor fuses
Semiconductor (AC) fuses

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

Total clearing I t
2
2
2
I t (A s) 10 ms (5 ms) 10 ms (2.5 ms) 7.5 ms (1.8 ms) 6.5 ms (1.5 ms) 5.5 ms (1.3 ms) 4.5 ms (1 ms) 3.5 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) URC (000)
10 ms (5 ms) 10 ms (2.5 ms) 4.5 ms (1 ms) 3 ms (0.6 ms) 2 ms (0.4 ms) 1 ms (0.2 ms) gRB
2
2
I t (A s) 7.5 ms (1.8 ms) 6.5 ms (1.5 ms) 5.5 ms (1.3 ms) 3.5 ms (0.8 ms) 1.5 ms (0.3 ms) 10 6 URD (000)
10 5

5
10
250-280 A
200 A
4 180 A
10
150 A
10 4
110 A
65 A 90 A
3 85 A
10 75 A
50 A
10 3
10 2 10 3 10 4 10 5
Ip (A)
10 2
2
2
10 2 10 3 10 4 10 5 10 6 I t (A s) 10 ms (5 ms) 10 ms (2.5 ms) 7.5 ms (1.8 ms) 6.5 ms (1.5 ms) 5.5 ms (1.3 ms) 4.5 ms (1 ms) 3.5 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) URC (2000)
Above and right: Horizontal curves show, for each rated Ip (A) URD (2000)
2
2
current, maximum values of total clearing I t (I t ) as a 10 6
t
function of prospective current Ip @ UN with cos ϕ = 0.15.
Oblique lines indicate total clearing duration Tt, with asso-
500 A
ciated pre-arcing duration in brackets.
400-450 A
355 A
5
I t corrective factor 10 325 A
2
300 A
K 235 A
200 A
1.4
175 A
4
1.2 10
Left: Mean curve
1 shows variation of
total clearing time
2
0.8 (I t ) and total
t
clearing duration 3
0.6 10
Tt as a function of
10 2 10 3 10 4 10 5
operating voltage
0.4 Ip (A)
U.
0.2
Peak arc voltage
0
U (V)
0 200 400 500 660 Um (V)
Watts loss 1400
Left: Curve shows peak
P/Pn 1200 value Um of the arc
1 Left: Curve enables com- 1000 voltage which appears
0.9 putation of power losses across fuse-link as
0.8 P for IN-rated fuse as a 800 a function of operating
0.7 function of R.M.S. cur- voltage U @ cos ϕ = 0.15
0.6 rent I (as a multiple of IN
0.5 for steady state opera- 600
0.4 tion)
0.3
0.2
0.1 0 200 400 600 700 U (V)
0
0.5 0.6 0.7 0.8 0.9 1.0 1.1 I/In
220 12/04