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Switch Disconnectors
3KM Switch Disconnectors with Fuses and Isolating Plug Connector up to 400 A
Fuses
7/82
Siemens LV 10 · 2014
7
■
Overview
The 3KM switch disconnectors with fuses 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 de-
vice.
The following table shows the permissible load currents of the
SITOR semiconductor fuses for installation in 3KM. 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 3KM fuse switch disconnectors: Assignment table
SITOR semiconductor fuse data
Permissible load currents of fuse when installed in
3KM for busbar mounting
Type 3KM
Alternative type 3KM
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
3NE1020-2
80
690
gR
00 25
3KM52
00 80
3KM53
00 80
3NE1021-0
100
690
gS
00 35
3KM52
00 100
3KM53
00 100
3NE1021-2
100
690
gR
00 35
3KM52
00 100
3KM53
00 100
3NE1022-0
125
690
gS
00 50
3KM52
00 125
3KM53
00 125
3NE1022-2
125
690
gR
00 50
3KM52
00 125
3KM53
00 125
3NE1224-0
160
690
gS
1 70
3KM55
1 160
3KM57
2 160
3NE1224-2/-3 160
690
gR
1 70
3KM55
1 160
3KM57
2 160
3NE1225-0
200
690
gS
1 95
3KM55
1 200
3KM57
2 200
3NE1225-2/-3 200
690
gR
1 95
3KM55
1 200
3KM57
2 200
3NE1227-0
250
690
gS
1 120
3KM55
1 250
3KM57
2 250
3NE1227-2/-3 250
690
gR
1 120
3KM55
1 245
3KM57
2 250
3NE1230-0
315
690
gS
1 2x 70
3KM57
2 315
--
--
--
3NE1230-2/-3 315
690
gR
1 2x 70
3KM57
2 280
--
--
--
3NE1331-0
350
690
gS
2 2x 95
3KM57
2 330
--
--
--
3NE1331-2/-3 350
690
gR
2 2x 95
3KM57
2 300
--
--
--
3NE1332-0
400
690
gS
2 2x 95
3KM57
2 375
--
--
--
3NE1332-2/-3 400
690
gR
2 2x 95
3KM57
2 315
--
--
--
3NE1333-0
450
690
gS
2 2x 120
3KM57
2 400
--
--
--
3NE1333-2/-3 450
690
gR
2 2x 120
3KM57
2 325
--
--
--
3NE1334-0
500
690
gS
2 2x 120
3KM57
2 400
--
--
--
3NE1334-2/-3 500
690
gR
2 2x 120
3KM57
2 350
--
--
--
3NE1802-0
40
690
gS
000 10
3KM50
00 40
3KM52
00 40
3NE1803-0
35
690
gS
000 6
3KM50
00 35
3KM52
00 35
3NE1813-0
16
690
gS
000 1.5
3KM50
00 16
3KM52
00 16
3NE1814-0
20
690
gS
000 2.5
3KM50
00 20
3KM52
00 20
3NE1815-0
25
690
gS
000 4
3KM50
00 25
3KM52
00 25
3NE1817-0
50
690
gS
000 10
3KM50
00 50
3KM52
00 50
3NE1818-0
63
690
gS
000 16
3KM50
00 63
3KM52
00 63
3NE1820-0
80
690
gS
000 25
3KM52
00 80
--
--
--
3NE3221
100
1000
aR
1 35
3KM55
1 90
3KM57
2 95
3NE3222
125
1000
aR
1 50
3KM55
1 110
3KM57
2 115
3NE3224
160
1000
aR
1 70
3KM55
1 140
3KM57
2 150
3NE3225
200
1000
aR
1 95
3KM55
1 175
3KM57
2 180
3NE3227
250
1000
aR
1 120
3KM55
1 210
3KM57
2 220
3NE3230-0B 315
1000
aR
1 185
3KM57
2 240
--
--
--
3NE3231
350
1000
aR
1 240
3KM57
2 265
--
--
--
3NE3232-0B 400
1000
aR
1 240
3KM57
2 290
--
--
--
3NE3233
450
1000
aR
1 2x 150
3KM57
2 320
--
--
--
3NE3332-0B 400
1000
aR
2 240
3KM57
2 290
--
--
--
3NE3333
450
1000
aR
2 2x 150
3KM57
2 320
--
--
--
3NE3334-0B 500
1000
aR
2 2x 150
3KM57
2 360
--
--
--
3NE3335
560
1000
aR
2 2x 185
3KM57
2 400
--
--
--
© Siemens AG 2014