Siemens AC-21 Brochure page 29

■
Benefits
For the 3KL switch disconnectors with fuse, a UL approval has
been granted in combination with the new 3NE1 ...–2 fuse
series.
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Area of application
When SITOR semiconductor protection fuses are used in
SENTRIC NP, SENTRIC KL and 3KM switch disconnectors, a
partial reduction of the rated current of the fuse is necessary due
to the higher power loss in comparison with LV HRC fuses for line
protection. The use of SITOR semiconductor protection fuses in
switch disconnectors may at times result in current values above
the rated currents of the switches. These increased currents oc-
cur only when the switch is used with SITOR semiconductor pro-
tection fuses; they cannot be utilized when the switch is used
with standard LV HRC fuses. Details are given in the table below.
When SITOR semiconductor protection fuses of series 3NC24,
3NC84, 3NE33 and 3NE43 are used, the switching capacity of
the switch disconnectors as specified in the catalog must not be
fully utilized, as the blades of these fuses (in contrast to LV HRC
line-protection fuses) are slotted. Occasional switching of cur-
rents up to the rated currents of the fuses is permissible.
Due to the mechanical stress on the relatively long fuse blades,
3NE41 SITOR semiconductor protection fuses should be
switched only occasionally and only at zero current. If it is only
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Selection and ordering data
For switch disconnectors
Type Type Permissible load cur-
rent of the SITOR
semiconductor protec-
tion fuse in the switch
disconnector
A
For SENTRIC 3NP fuse switch disconnectors
3NP35, 3NP40 1, 16
3NP50 3NP40 7 20
25
35
40
50
63
80
3NP50 3NP40 7 100
125
125 (105)
3NP52 3NP42 7 160
160
200
200 (190)
250
250 (235)
3NP53 3NP43 7 315
315
3NP53 3NP43 7 350
350
400
3NP54 3NP44 7, 450
3NP44 76 450 (425)
500 (480)
500 (465)
1) If a cyclic load is applied, it may be necessary to further reduce the cur-
rents (please inquire about precise values).
2) Values in brackets apply to the SENTRIC 3NP4 fuse switch disconnector.
* This quantity or a multiple thereof can be ordered.
Required conductor
cross-section
Cu
1)
2
mm
1.5
2.5
4
6
10
10
16
25
35
50
2)
50
70
70
95
2)
95
120
2)
120
2 × 70
2 × 70
2 × 95
2 × 95
2 × 95
2 × 120
2)
2 × 120
2)
2 × 120
2)
2 × 120
Fuses and Fuse Systems
permissible to switch at zero current, the switch must be marked
accordingly.
The use of SITOR semiconductor protection fuses rated above
63 A for overload protection is also not permitted when gR fuses
(except 3NE1) are used.
The operating voltage is limited by the rated voltage of the
switch disconnector or the fuses. During current-free switching,
the limit value is the rated insulation voltage of the switch discon-
nector.
The 3NE1 "double protection fuses" can be used both as all-
range fuses (gR/gS) as well as for semiconductor and line pro-
tection.
Due to the dimensions of SITOR semiconductor protection
fuses, only the fuses shown in the Selection and ordering data
below can be used in the SENTRIC NP, SENTRIC KL and 3KM
switch disconnectors.
SITOR semiconductor protection fuse
Size Opera- Rated Rated
tional current voltage
class
A V
000 gR/gS 16 690
gR/gS 20
gR/gS 25
gR/gS 35
gR/gS 40 690
gR/gS 50
gR/gS 63
gR/gS 80
00 gR/gS 100 690
gR/gS 125
gR 125
1 gR/gS 160 690
gR 160
gR/gS 200
gR 200
gR/gS 250
gR 250
2 gR/gS 315
gR 315
2 gR/gS 350 690
2 gR 350
gR/gS 400
gR/gS 450
gR 450
gR/gS 500
gR 500
Introduction
DT Order No. PS* Weight
per PU
approx.
kg
}
3NE1 813-0 9 units 0.127
}
3NE1 814-0 9 units 0.128
}
3NE1 815-0 9 units 0.127
}
3NE1 803-0 9 units 0.128
}
3NE1 802-0 9 units 0.127
}
3NE1 817-0 9 units 0.128
}
3NE1 818-0 9 units 0.128
}
3NE1 820-0 9 units 0.129
}
3NE1 021-0 3 units 0.202
}
3NE1 022-0 3 units 0.202
}
3NE1 022-2 3 units 0.203
}
3NE1 224-0 3 units 0.580
}
3NE1 224-2 3 units 0.613
}
3NE1 225-0 3 units 0.582
}
3NE1 225-2 3 units 0.612
}
3NE1 227-0 3 units 0.580
}
3NE1 227-2 3 units 0.626
}
3NE1 230-0 3 units 0.581
}
3NE1 230-2 3 units 0.615
}
3NE1 331-0 3 units 0.766
}
3NE1 331-2 3 units 0.754
}
3NE1 332-0 3 units 0.743
}
3NE1 333-0 3 units 0.760
}
3NE1 333-2 3 units 0.768
}
3NE1 334-0 3 units 0.766
}
3NE1 334-2 3 units 0.768
Siemens LV 10 · 2004 7/29
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