Page 10 - 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

Total clearing I t
2

2
2
I t (A s) 10 ms (2.5 ms) 7.5 ms (1.3 ms) 3.5 ms (0.3 ms) I t (A s) 10 ms (2.5 ms) 7.5 ms (1.3 ms) 3.5 ms (0.3 ms)
2
2
gRB 10 ms (5 ms) 9 ms (1.8 ms) 6.5 ms (1 ms) 6 ms (0.8 ms) 5 ms (0.6 ms) 4 ms (0.4 ms) 3 ms (0.2 ms) URB 10 ms (5 ms) 9 ms (1.8 ms) 6.5 ms (1 ms) 6 ms (0.8 ms) 5 ms (0.6 ms) 4 ms (0.4 ms) 3 ms (0.2 ms)
10 5 10 6
450 A
160 A 5 400 A
10 350 A
4 315 A
10 125 A
250 A
100 A 200 A
80 A 10 4 160 A
125 A
3 63 A 100 A
10
50 A 80 A
40 A 10 3 63 A
50 A
32 A
40 A
25 A
2
10 20 A 2 32 A
16 A 10 25 A
20 A
16 A
10 1 10 1
10 1 10 2 10 3 10 4 10 5 10 6 10 1 10 2 10 3 10 4 10 5 10 6
Ip (A) Ip (A)
2
2
Above: horizontal curves show, for each rated current, maximum values of total clearing I t (I t ) as a function of prospective current
t
Ip. @ UN with cosϕ = 0.15.
Oblique lines indicate total clearing duration Tt, with associated pre-arcing duration shown in brackets.
I t corrective factor Peak arc voltage
2
K Um (V)
1600
1.2
1400
1
Left: Mean curves 1200
0.8 show variation of Left: Curve shows peak
total clearing time 1000 value Um of the arc voltage
0.6 (I 2 t ) and total clea- 800 which appears across
t
ring duration Tt as a fuse- link as a function of
0.4 function of operating 600 operating voltage U @
voltage U. cos ϕ = 0.15
0.2 400
200
0
100 200 300 400 500 600 700 800 0 U (V)
0 U (V)
0 200 400 600 700
Watts loss
P/Pn
1
0.9 Left: Curve enables computation of
0.8 power losses P for a I -rated fuse as a
N
0.7 function of R.M.S. current I
0.6 (as a multiple of I for steady state ope-
N
0.5 ration)
0.4
0.3
0.2
0.1
0
0.5 0.6 0.7 0.8 0.9 1.0 1.1 I/In

SCAC57
12/04