145 / 158
7
Switch Disconnectors
3NP5 Fuse Switch Disconnectors up to 630 A
Fuses
7/145
Siemens LV 10 · 2014
■
Overview
3NP5 fuse switch disconnectors are suitable for all fuses in
LV HRC design,
see chapter 5
.
SITOR semiconductor fuses in LV HRC design can also be used,
although it must be noted that, compared to cable and line pro-
tection fuses, these get much hotter during operation. For this
reason, the fuse must be operated below the rated current
I
n
of the device (derating) when installed in a closed switching
device.
The following table shows the permissible load currents of the
SITOR semiconductor fuses for installation in 3NP5. The values
were determined using the conductor cross-sections specified
in the table.
Note
If using smaller cross-sections, a considerably higher derating is
required due to the lower heat dissipation.
SITOR semiconductor fuses for 3NP5 fuse switch disconnectors: Assignment table
SITOR semiconductor fuse data
Permissible load currents of fuse when installed in
3NP5 for floor mounting
Type 3NP5
Alternative type 3NP5
Type
1)
Rated
current
I
n
Rated
voltage
2)
Opera-
tional
class
Size Required con-
ductor cross-
section Cu
Type
Size Permissible
load
current
3)
Type
Size Permissible
load
current
3)
A
V AC
mm²
A
A
3NC2423..
150
500
gR
3 70
3NP54
3 145
--
--
--
3NC2425..
200
500
gR
3 95
3NP54
3 180
--
--
--
3NC2427..
250
500
gR
3 120
3NP54
3 225
--
--
--
3NC2428..
300
500
gR
3 185
3NP54
3 255
--
--
--
3NC2431..
350
500
gR
3 240
3NP54
3 330
--
--
--
3NC2432..
400
500
aR
3 240
3NP54
3 400
--
--
--
3NC3336-1
630
1000
aR
3 2x (40x5)
3NP54
3 530
--
--
--
3NC3337-1
710
1000
aR
3 2x (50x5)
3NP54
3 570
--
--
--
3NC3338-1
800
1000
aR
3 2x (40x8)
3NP54
3 630
--
--
--
3NC3340-1
900
1000
aR
3 2x (40x8)
3NP54
3 700
4)
--
--
--
3NC3341-1
1000
1000
aR
3 2x (50x8)
3NP54
3 770
4)
--
--
--
3NC3342-1
1100
800
aR
3 2x (50x8)
3NP54
3 800
4)
--
--
--
3NC3343-1
1250
800
aR
3 2x (50x8)
3NP54
3 850
4)
--
--
--
3NC3430-1
315
1250
aR
3 2x95
3NP54
3 295
--
--
--
3NC3432-1
400
1250
aR
3 2x120
3NP54
3 355
--
--
--
3NC3434-1
500
1250
aR
3 2x150
3NP54
3 440
--
--
--
3NC3436-1
630
1250
aR
3 2x (40x5)
3NP54
3 520
--
--
--
3NC3438-1
800
1100
aR
3 2x (40x8)
3NP54
3 625
--
--
--
3NC8423..
150
660
gR
3 70
3NP54
3 135
--
--
--
3NC8425..
200
660
gR
3 95
3NP54
3 180
--
--
--
3NC8427..
250
660
gR
3 120
3NP54
3 225
--
--
--
3NC8431..
350
660
gR
3 240
3NP54
3 300
--
--
--
3NC8434..
500
660
gR
3 2x 150
3NP54
3 425
--
--
--
3NC8444-3C 1000
600
aR
3 2x (60x6)
3NP54
3 800
4)
--
--
--
3NE1020-2
80
690
gR
00 25
3NP50
00 80
--
--
--
3NE1021-0
100
690
gS
00 35
3NP50
00 100
--
--
--
3NE1021-2
100
690
gR
00 35
3NP50
00 100
--
--
--
3NE1022-0
125
690
gS
00 50
3NP50
00 125
--
--
--
3NE1022-2
125
690
gR
00 50
3NP50
00 125
--
--
--
3NE1224-0
160
690
gS
1 70
3NP52
1 160
3NP53
2 160
3NE1224-2/-3 160
690
gR
1 70
3NP52
1 160
3NP53
2 160
3NE1225-0
200
690
gS
1 95
3NP52
1 200
3NP53
2 200
3NE1225-2
200
690
gR
1 95
3NP52
1 200
3NP53
2 200
3NE1225-3
200
690
gR
1 95
3NP52
1 190
3NP53
2 200
3NE1227-0
250
690
gS
1 120
3NP52
1 250
3NP53
2 250
3NE1227-2
250
690
gR
1 120
3NP52
1 250
3NP53
2 250
3NE1227-3
250
690
gR
1 120
3NP52
1 235
3NP53
2 250
3NE1230-0
315
690
gS
1 2x 70
3NP53
2 315
--
--
--
3NE1230-2/-3 315
690
gR
1 2x 70
3NP53
2 315
--
--
--
3NE1331-0
350
690
gS
2 2x 95
3NP53
2 350
3NP54
3 350
3NE1331-2/-3 350
690
gR
2 2x 95
3NP53
2 350
3NP54
3 350
3NE1332-0
400
690
gS
2 2x 95
3NP53
2 400
3NP54
3 400
© Siemens AG 2014