Siemens 3KA50 Brochure - Page 17

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Area of application

SENTRIC NP fuse switch disconnectors are switching devices

for the occasional manual connection and disconnection of

loads and distribution boards. They are designed to connect the

specified rated nominal current (including a specified overload),

to carry it and to disconnect it.

SENTRIC NP fuse switch disconnectors are used to isolate all

poles of downstream electrical loads safely under load

conditions.

The SENTRIC NP fuse switch disconnectors are ideally suited for

surface mounting or installation in distribution boards (e.g.

ALPHA, SIKUS), meter cabinets (e.g. ALPHA 400-ZS), and

molded-plastic distribution panels e.g. SENTRIC HP.

The ability to mount these devices onto many different busbar

systems supports a wide range of applications in the

construction of control cabinets and control systems.

SENTRIC NP size NH 000

35 mm standard mounting rails and are optimized for use with

other switching devices, for example, in capacitor units for the

purpose of reactive-power compensation.

SENTRIC NP fuse switch disconnectors are used in combination

with semiconductor protection fuses (e.g. SITOR) for the

effective protection of frequency converters and soft starters.

SENTRIC NP fuse switch disconnectors

3NP40 10

3NP40 70

The SENTRIC NP fuse switch disconnectors are suitable for use

in any climate and comply with the specifications of

IEC 60947-1, IEC 60947-3 and DIN VDE 0660 Part 107.

The 3NP40 1 and 3NP40 7 variants are available tin-plated for

use in extremely sulphurous atmospheres (available on request).

In addition, the SENTRIC 3NP5 series of fuse switch disconnec-

tors complies with the requirements of BS 5419 and is also ap-

proved for marine applications.

All SENTRIC NP fuse switch connectors are either sealable as

standard or using accessories.

1) Use only approved fuse links.

2) Corresponds to fuse sizes NH 000 (NH 00C) or NH 00

with smaller dimensions; maximum width 21 mm according to

IEC 60269-2-1 and DIN VDE 43620.

SENTRIC NP Fuse Switch Disconnectors

and NH 00 can be snapped onto

3NP52 with open fuse carrier

)

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Design

The SENTRIC NP fuse switch disconnectors comprise a fuse

base and a removable fuse carrier with an inspection and mea-

suring function window.

Lyre-shaped contacts, arc chambers and connection pieces are

integrated in the fuse base. The fuse links or isolating links are

stored in the fuse carrier.

The fuse links can be replaced or changed without the need for

any tools.

The three conducting paths in the fuse base as well as the fuse

links in the fuse carrier are separated by partition walls that over-

lap when the device is opened and closed.

This strong self-protection is known as "full compartmentaliza-

tion" and effectively and reliably prevents inter-phase arcing.

LV HRC fuses of sizes NH 000 to NH 3 according to

IEC 60269-2-1 and DIN VDE 43620 are used in the SENTRIC NP

fuse switch disconnectors. Furthermore, SITOR semiconductor

protection fuses are also used.

For further details, see the operating instructions for the

SENTRIC NP fuse switch disconnectors.

Auxiliary switches

The SENTRIC NP fuse switch disconnectors can be retrofitted

with auxiliary switches for signaling the switch position of the

fuse carrier.

One contact element (1 CO) can be mounted on size NH 000 of

the SENTRIC 3NP4 fuse switch disconnector and two contact el-

ements (1 CO) can be mounted on sizes NH 00 to NH 3.

Further variants and accessories for the SENTRIC NP fuse

switch disconnectors as well as the complete SENTRIC NP se-

ries in industry-compatible design for increased technical re-

quirements can be found in Catalog LV 30.

General data

Siemens LV 10 · 2004

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