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7
Switch Disconnectors
3KL Switch Disconnectors with Fuses up to 800 A
Fuses
7/75
Siemens LV 10 · 2014
■
Overview
The 3KL 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 3KL. 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 3KL fuse switch disconnectors: Assignment table
SITOR semiconductor fuse data
Permissible load currents of fuse when installed in
3KL for floor mounting
Type 3KL
Alternative type - 3KL
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
3NC423..
150
500
gR
3 70
3KL61
3 145
3KL62
3 150
3NC425..
200
500
gR
3 95
3KL61
3 180
3KL62
3 190
3NC427..
250
500
gR
3 120
3KL61
3 225
3KL62
3 240
3NC428..
300
500
gR
3 185
3KL61
3 255
3KL62
3 270
3NC431..
350
500
gR
3 240
3KL61
3 330
3KL62
3 345
3NC432..
400
500
aR
3 240
3KL61
3 400
3KL62
3 400
3NC3336-1
630
1000
aR
3 2x (40x5)
3KL62
3 500
3KL61
3 480
3NC3337-1
710
1000
aR
3 2x (50x5)
3KL62
3 540
--
--
--
3NC3338-1
800
1000
aR
3 2x (40x8)
3KL62
3 600
--
--
--
3NC3340-1
900
1000
aR
3 2x (40x8)
3KL62
3 650
--
--
--
3NC3341-1
1000
1000
aR
3 2x (50x8)
3KL62
3 720
--
--
--
3NC3342-1
1100
800
aR
3 2x (50x8)
3KL62
3 800
--
--
--
3NC3343-1
1250
800
aR
3 2x (50x8)
3KL62
3 800
--
--
--
3NC3430-1
315
1250
aR
3 2x95
3KL61
3 285
3KL62
3 300
3NC3432-1
400
1250
aR
3 2x120
3KL61
3 365
3KL62
3 380
3NC3434-1
500
1250
aR
3 2x150
3KL61
3 425
3KL62
3 450
3NC3436-1
630
1250
aR
3 2x (40x5)
3KL61
3 500
3KL62
3 540
3NC3438-1
800
1100
aR
3 2x (40x8)
3KL62
3 650
--
--
--
3NC8423..
150
660
gR
3 70
3KL61
3 135
3KL62
3 140
3NC8425..
200
660
gR
3 95
3KL61
3 180
3KL62
3 190
3NC8427..
250
660
gR
3 120
3KL61
3 225
3KL62
3 240
3NC8431..
350
660
gR
3 240
3KL61
3 300
3KL62
3 315
3NC8434..
500
660
gR
3 2x 150
3KL61
3 425
3KL62
3 450
3NC8444..
1000
600
aR
3 2x (60x6)
3KL62
3 800
3KL61
3 630
3NE1020-2
80
690
gR
00 25
3KL52
00 80
3KL53
00 80
3NE1021-0
100
690
gS
00 35
3KL52
00 100
3KL53
00 100
3NE1021-2
100
690
gR
00 35
3KL52
00 100
3KL53
00 100
3NE1022-0
125
690
gS
00 50
3KL52
00 125
3KL53
00 125
3NE1022-2
125
690
gR
00 50
3KL52
00 125
3KL53
00 125
3NE1224-0
160
690
gS
1 70
3KL55
1 160
3KL57
2 160
3NE1224-2/-3 160
690
gR
1 70
3KL55
1 160
3KL57
2 160
3NE1225-0
200
690
gS
1 95
3KL55
1 200
3KL57
2 200
3NE1225-2/-3 200
690
gR
1 95
3KL55
1 200
3KL57
2 200
3NE1227-0
250
690
gS
1 120
3KL55
1 250
3KL57
2 250
3NE1227-2/-3 250
690
gR
1 120
3KL55
1 245
3KL57
2 250
3NE1230-0
315
690
gS
1 2x 70
3KL57
2 315
--
--
--
3NE1230-2/-3 315
690
gR
1 2x 70
3KL57
2 280
--
--
--
3NE1331-0
350
690
gS
2 2x 95
3KL57
2 330
3KL61
3 350
3NE1331-2/-3 350
690
gR
2 2x 95
3KL57
2 300
3KL61
3 350
3NE1332-0
400
690
gS
2 2x 95
3KL57
2 375
3KL61
3 400
3NE1332-2/-3 400
690
gR
2 2x 95
3KL57
2 340
3KL61
3 400
3NE1333-0
450
690
gS
2 2x 120
3KL61
3 450
3KL62
3 450
3NE1333-2/-3 450
690
gR
2 2x 120
3KL61
3 450
3KL62
3 450
3NE1334-0
500
690
gS
2 2x 120
3KL61
3 500
3KL62
3 500
3NE1334-2/-3 500
690
gR
2 2x 120
3KL61
3 500
3KL62
3 500
3NE1435-0
560
690
gS
3 2x 150
3KL61
3 560
3KL62
3 560
3NE1435-2/-3 560
690
gR
3 2x 150
3KL61
3 560
3KL62
3 560
© Siemens AG 2014