Siemens 3KA571 Brochure - Page 28

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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.

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.

■

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

49522

49510

DIN VDE

49523

49511

DIN VDE

49524

49514

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

2 ... 100

AC kA

50,

40 (E16),

DC kA

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 0680

IEC 60269

EN 60269

DIN 43620

DIN 43623

gL/gG, aM

aR, gR

500/690

600/690/1000

250/440

2 ... 1250

16 ... 630

120

> 50

-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