Page 118 - Ferraz semiconductor DIN

Protistor ®
Semiconductor (AC) fuses

Times/Current Characteristics size 3
Protistor ® Square-body Fuses: NH Plain Blades gS
350A
450A
400A
315A 500A
550A
7000 a=130 Cut off characteristics - Peak let thru
5000 630A A 2 =0.75
current - size 3
3000 B 1 =1.25
2000 B 2 =0.80 for tp>100s
70000
B 2 =0.75 for 100≥tp≥5s 630 A
1000 50000 Im = 2.3 Ip
700 B 2 =0.60 for 5s>tp 30000 550 A
500 Cf 3 =0.80 20000
300 500 A
200 10000 450 A
100 7000 400 A
5000
70 Maximum peak let thru current (Im)(A)
50 3000 350 A
2000
30
Actual prearcing time (s) 10 7 5 3 2 1000
315 A
20
700
500
300
200
0.7 1 200 300 500 700 1000 2000 3000 5000 7000
0.5 10000 20000 30000 50000 70000 100000 200000
0.3 50 Hz RMS Symetrical prospective current (Ip)(A)
0.2
0.1
0.07
0.05
Peak arc voltage vs applied AC voltage size 3
0.03
0.02
0.01 1600
0.007
0.005 1500
0.003
1400
0.002
Peak arc voltage (V) 1300
0.001
0.0007 1200
0.0005
0.0003 1100
0.0002 1000

300 500 700 1000 2000 3000 5000 7000 10000 20000 30000 50000 900
800
RMS value of prearc current (A)
700
600

Clearing I²t and arcing time correction 100 200 300 400 500 600 700
factor vs Applied AC voltage size 3 Applied AC voltage (V

1.3
1.2
Watts loss vs % rated current size 3
1.1 1
Clearing I 2 t and arcing time correction factor 0.8 Correction Factor for Watts Loss 0.8
0.9

0.7
0.6
0.6
0.5
0.4
0.3
0.2 0.4
0.2
0.1
100 200 300 400 500 600 700
Applied AC voltage (V) 50 60 70 80 90
% rated current

7