Catalog Add On: BETA Low-Voltage Circuit Protection ...

4
BETA Protecting
SITOR Semiconductor Fuses
SITOR, LV HRC design
Series 3NE5 4..
Size: 3
Operational class: aR
Rated voltage: 1500 V AC
Rated current: 160 ... 600 A
Time/current characteristic curves diagram Let-through characteristics (current limitation at 50 Hz)
I
vs
Virtual pre-arcing time
10 4
6
4
2
10 3
6
4
2
10 2
6
4
2
10 1
6
4
2
10 0
6
4
2
10 -1
6
4
2
10 -2
6
4
2
102 10 -3
Correction factor k A for breaking I 2 t value Peak arc voltage
A
Correction factor
1
0.8
0.6
0.4
0.2
4/34
2
" # )
! # )
! # )
" )
$ )
4 6 10
p
3 8 2 4 6 104 8 2 4
Prospective short-circuit current )
0 500
1000
Recovery voltage w 8
Siemens ET B1 AO · 2008, Characteristic curves
I201_10873
1500
© Siemens AG 2007
I2_10872
6 105 8
Let-through current c )
8
Ûs
Peak arc voltage
4
2
10 4
6
4
2
Unlimited peak values:
DC component 50 %
DC component 0 %
" # )
! # )
! # )
103 2 4 6 104246
10
p
5
3
10
8
8 2
Prospective short-circuit current )
4000
3600
3200
2800
2400
2000
1600
1200
800
400
0
0 400 800 1200 1600 2000
Recovery voltage w 8
I2_10874
" )
$ )
I2_10875