Page 328 - Ferraz semiconductor DIN

Semiconductor fuses
Semiconductor (AC) fuses

Other Protistor Fuses
®
Ferrule Fuses
22x58 gRC (URD) - 600 V to 690 VAC

Total clearing I t I t corrective factor
2
2
K
2
2
I t (A s) 1.4
10 ms (5 ms) 10 ms (2,8 ms) 7 ms (1,5 ms) 6 ms (1,3 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) 1.2 Mean curves showing
5
10 8 ms (2 ms) 5 ms (1 ms) 1.0 1 2 variation of total clearing
t
0.8 time (I 2 t ) and total clea-
ring duration Tt as a func-
135 A tion of operating voltage U.
125 A 0.6
100 A 1- 125 and 135 A rating
10 4
0.4 2- 20 to100 A rating
80 A
0.2
63 A
0 U (V)
50 A 0 200 400 600 800
10 3
40 A
Peak arc voltage
32 A
25 A
Um (V)
20 A
10 2
1600 Curve showing peak
2
value Um of arc vol-
1400
1 tage which appears
1200 across fuse-link as a
1000 function of operating
10
voltage U @ cos ϕ =
2 3 4 800
10 10 10 10 0.15
Ip (A)
600 1-125 and 135A rating
Above: Horizontal curves show, for each rated current, maximum values of total 2-20 to 100A rating
clearing I 2 t (I 2 t ) as a function of prospective current Ip @ 690 V. cosϕ = 0.15
t
(125-135 A @ 600 V.cosϕ = 0.15)
Oblique lines indicate total clearing duration Tt with associated pre-arcing
duration in brackets. 0 200 400 600 800 U (V)
Current limitation curves
I (A)
C
10 4 Ic= 2 Ip 135 A
125 A
100 A
80 A
Ic= 2.5 Ip 63 A
50 A
40 A
32 A
25 A
20A
3
10
Left: Curves show value of peak let-through current
IC as a function of the available fault current Ip.
2
10

10
10 10 2 10 3 10 4 10 5
Ip (A)

SCAC180 12/04