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BETA Protecting
Low-Voltage Fuse Systems
3
NW. ...-0HG Class CC fuse systems
3/28
Siemens ET B1 · 10/2008
3
*
You can order this quantity or a multiple thereof.
■
Overview
Class CC fuses are used for "branch circuit protection".
The encapsulated fuse holders are tested and designed to the
US National Electrical Code NEC 210.20(A) so that in continuous
operation only 80 % of the rated current is permitted as operational
current.
An operational current of 100 % of the rated current (30 A) is only
permitted short-time.
The devices are prepared for the inscription labels of the ALPHA
FIX terminal blocks 8WH8 120-7AA15 and 8WH8 120-7XA05.
There are three different series:
•
Characteristic: slow, 3NW1 ...-0HG
For the protection of control transformers, reactors, inductances.
Significantly slower than the minimum requirements of 12 s at
2
×
I
n
as specified by UL for Class CC fuses.
•
Characteristic: quick 3NW2 ...-0HG
For a wide range of applications, for the protection of lighting
installations, heating, control systems.
•
Characteristic: slow, current-limiting, 3NW3 ...-0HG
Slow for overloads and quick for short circuits. High current
limitation for the protection of motor circuits.
■
Benefits
•
For switchgear assemblies and mechanical engineers who
export their plants. Compliance with the American standard is
as follows:
•
Approved according to UL and CSA for typical "branch circuit
protection" applications. This facilitates export.
•
Modern design with touch protection to BGV A3 ensures safe
installation.
■
Technical specifications
■
Selection and ordering data
Class CC fuse holders
3
NW7 5.3-0HG
Standards
UL 512; CSA C22.2
Approved acc. to
UL 512; UL File No. E171267
Rated voltage
V AC 600
Rated current
I
n
A
30
Max. power dissipation
of fuse links
•
With cable, 6 mm
2
W 3
•
With cable, 10 mm
2
W 4.3
Conductor cross-sections
•
Solid and stranded
mm
2
1.5 ... 25
•
AWG Conductor cross-section, solid and stranded
AWG 18 ... 4
Class CC fuse links
3
NW1 ...-0HG
3
NW2 ...-0HG
3
NW3 ...-0HG
Standards
UL 248-4; CSA C22.2
Approved acc. to
UL 248-4; UL File Number E258218
Characteristic
Slow
Quick
Slow, current limiting
Rated voltage
V AC
V DC
600
600
600
150 (3 .... 15
A)
300 (
< 3 A, > 15 A)
Rated breaking capacity
kA AC 200
Number of poles U
n
I
n
MW DT Order No.
Price
per PU
PG PU PS*/
P. unit
Weight
per PU
approx.
V
A
Unit(s) Unit(s) kg
Class CC fuse holders
1
P
600
30
1
C
3
NW7 513-0HG
018 1
12 0.056
2
P
600
30
2
C
3
NW7 523-0HG
018 1
6 0.118
3
P
600
30
3
C
3
NW7 533-0HG
018 1
4 0.172
© Siemens AG 2008