Page 6 - Ferraz semiconductor DIN

Semiconductor fuses
Semiconductor (AC) fuses

Protistor Square-body Fuses
®
PSC gR/aR sizes 000/00
gR/aR - 500 to 690 VAC DIN 000

DC Application data
Rated
Curve Ipm (A)
L/R (ms) Um (V) current (A)
20 a 60
100 d c b a 25 a 65
1400 32 a 90
90 L/R =80 ms
L/R =25 ms 40 a 120
80 1200
50 a 150
70 L/R =10 ms
1000 63 a 200
60 80 a 270
800
50 100 a 370
40 600 125 a 500
160 a 700
30 400 200 b 1200
20 250 c 1800
200
10 315 c 2200
0 0 350 d 2600
100 200 300 400 500 600 700 100 200 300 400 500 600 700
0 U (V) 0 U (V) 400 d 3100
Above: Curves indicate permissible value of time Ipm values give minimum
constant L/R as a function of DC working voltage. Above: Curves indicates peak arc DC interrupting current in amps.
Curve a: Ratings from 20 to 160 A voltage Um which may appear across
Curve b: Rating 200 A fuse terminals at working voltage U.
Curve c: Ratings from 250 to 315 A
Curve d: Ratings from 350 to 400 A
Current limitation curves Watts loss
I (A) Below: Curves show, for each rating, value of peak let-through current P/Pn
C
Ic as a function of available fault current Ip.
Ip (A) 1
10 5 400 A 0.9
0.8
Ic = 2.5 Ip gRB URB Ic = 2.5 Ip Ic = 2 Ip 350 A 0.7
315 A
250 A
0.6
200 A
4 Ic = 2 Ip 125 A 160 A 0.5
10 100 A 125 A 0.4
80 A
63 A
50 A 100 A 0.3
80 A
40 A
32A 0.2
25 A
3 20 A 0.1
10
0
0.5 0.6 0.7 0.8 0.9 1.0 1.1 I/In
Above: Curve enables computation of
10 2 power losses P for a IN-rated fuse as a
function of R.M.S. current I
6
10 2 10 3 10 4 10 5 10 10 2 10 3 10 4 10 5 10 6 (as a multiple of IN for steady state
operation)
Time vs current characteristics
t (s) 25 40 63 100 t (s) 80 160 200 URB
20 32 50 80 125 gRB 100 125 250 315 350 400
10 4 10 4 Left: Curves show,
for each rated
3 3 current, pre-arcing
10 10
a= 130 a= 130 time vs. R.M.S.
A2=0.6 A2=0.6 pre-arcing current
2 B1= 1.25 2 B1= 1.25
10 10
B2= 0.6 B2= 0.6
Cf3= 0.8 Cf3= 0.8
C C'
10 10 C C'
1 1
10 -1 10 -1
Tolerance for
10 -2 10 -2 mean pre-arcing
current ± 8%.
10 -3 10 -3
10 -4 10 -4
2 3 4 2 3 4 5
10 10 10 10 I (A) 10 10 10 10 10 I (A)
SCAC54 12/04