Page 116 - Ferraz semiconductor DIN

Protistor ®
Semiconductor (AC) fuses

Times/Current Characteristics size 1
Protistor ® Square-body Fuses: NH Plain Blades gS
160A 250A
125A 200A 280A
7000 a=130 Cut off characteristics - Peak let thru
5000 A 2 =0.75
current - size 1
3000 B 1 =1.25
2000 B 2 =0.80 for tp>100s
70000
B 2 =0.75 for 100≥tp≥5s 50000 280 A
1000 Im = 2.3 Ip
700 B 2 =0.60 for 5s>tp 30000 250 A
500 Cf 3 =0.80 20000 200 A
300 160 A
200 10000 125 A
100 7000
5000
70
50 Maximum peak let thru current (Im)(A) 3000
2000
Actual prearcing time (s) 10 7 5 3 2 1000
30
20
700
500
300
200
0.7 1 200 300 500 700 1000 2000 3000 5000 7000 10000 20000 30000 50000 70000 100000 200000 300000
0.5
50 Hz RMS Symetrical prospective current (Ip)(A)
0.3
0.2
0.1
0.07
0.05 Peak arc voltage vs applied AC voltage size 1
0.03
0.02
0.01 1600
0.007
0.005 1500
0.003 1400
0.002
0.001
0.0007 1200
0.0005 Peak arc voltage (V) 1300
0.0003 1100
0.0002 1000
900
200 300 500 700 1000 2000 3000 5000 7000 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 1 Applied AC voltage (V)

1.3
1.2
Watts loss vs % rated current size 1
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 50 60 70 80 90
Applied AC voltage (V) % rated current

5