Siemens AC-21 Brochure page 28

Fuses and Fuse Systems
Introduction
■
Overview
Applications
Applications for fuses range from installation systems in residen-
tial buildings, non-residential buildings, trade and industry
through to switchgear installations of the utilities.
Fuses protect cables and conductors against overload and
short-circuit currents.
They are also suitable for protecting equipment and devices,
such as
• protecting motors during temporary overloads resulting from
the operating mode
• or short-circuits that occur occasionally.
They protect people in the event of a fault against impermissible
touch voltages in TN and TT networks.
They are used as back-up protection for miniature circuit-break-
ers and residual-current operated circuit-breakers. The high de-
gree of discrimination guarantees optimum protection in radial
and grid networks.
7
Fuse systems
Low-voltage fuses up to 1000 V fall into the following categories:
• Fuse systems that can be operated by non-specialists, such
as:
NEOZED and DIAZED, which are designed to prevent mis-
takes regarding the nominal current and which provide protec-
tion against touch.
• Fuse systems that must only be operated by the specialist,
such as:
LV HRC fuses which do not have to be designed to prevent
mistakes regarding the nominal current and which do not need
to provide protection against touch.
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Technical specifications
Standards
Dimensions
Operational classes
Rated voltage
Rated current range
Rated breaking capacity
Mounting position
Climatic stability
Non-interchangeability
7/28 Siemens LV 10 · 2004
NEOZED DIAZED
DIN VDE 0636 DIN VDE 0635
DIN VDE 0680 DIN VDE 0636
IEC 60269 DIN VDE 0680
EN 60269 IEC 60269
IEC 60241
CEE 16
EN 60269
DIN VDE DIN VDE
49522 49510
DIN VDE DIN VDE
49523 49511
DIN VDE DIN VDE
49524 49514
DIN VDE DIN VDE
49525 49515
DIN VDE
49516
gL/gG gL/gG, gR
slow, quick
AC V 400 500/690/750
DC V 250 500/600/750
A 2 ... 100
AC kA 50 50,
40 (E16),
DC kA 8 8,
1.6 (E16)
Any, but preferably vertical
°C up to 45
at 95 % rel. humidity
Due to gauge pieces Due to gauge screws Not necessary
Sizes
The sizes of low-voltage fuses and, for example, the non-inter-
changeability for operation by the non-specialists are defined in
DIN VDE 0636.
• NEOZED fuses are available in sizes D01, D02 and D03
• DIAZED fuses are available in sizes E 16, DII, DIII and DIV
• LV HRC fuses are available in sizes 000, 00, 0, 1, 2, 3, 4 and 4a
Operational classes
The operational classes of low-voltage fuses are defined in
IEC 60269. Operational class gG is defined for cable and line
protection.
According to DIN VDE 0636, cable and line protection was pre-
viously designated as gL, now gG is also applicable. During the
transition period, for the sake of clarity, gL/gG is specified in the
catalog.
The operational class aM for switchgear protection in the short-
circuit range is defined identically in IEC 60269 and
DIN VDE 0636.
Planning, characteristics
Detailed information and characteristics are available for plan-
ning purposes on the Internet at
www.siemens.de/installationstechnik.
LV HRC fuses SITOR
DIN VDE 0636 DIN VDE 0636
DIN VDE 0680 IEC 60269
IEC 60269 EN 60269
EN 60269
DIN 43620 DIN 43620
DIN 43623
gL/gG, aM aR, gR
500/690 600/690/1000
250/440
2 ... 1250 16 ... 630
120 > 50
25
-30 ... +50
at 95 % rel. humidity
Cylinder
fuses
IEC 60269
NF C 60200
NF C 63210
NF C 63211
NBN C 63269-
2-EN-2-1
CEI 32-4
IEC 60269-2-1
gG, aM
400/500
0.5 ... 100
up to 45
at 95 % rel. humidity