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BETA Protecting
Low-Voltage Fuse Systems
3
NP LV HRC fuse switch disconnectors
3/63
Siemens ET B1 · 10/2008
3
*
You can order this quantity or a multiple thereof.
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Overview
SENTRON 3NP4 and 3NP5 fuse switch disconnectors are
switching devices for the occasional manual switching/isolating
of loads and distribution boards. They are able to switch on,
lead and switch off the specified rated current (including a spe-
cific overload).
With the SENTRON 3NP4 and 3NP5 fuse switch disconnectors,
all poles of downstream electric loads can be safely disconnected
from the system under load.
The SENTRON 3NP4 and 3NP5 fuse switch disconnectors are
ideal for surface mounting and installation on and in distribution
boards (e.g. ALPHA, SIKUS), meter cabinets (e.g. ALPHA 400-ZS)
and molded-plastic distribution systems, such as 8HP.
The ability to mount them on a range of different busbar systems
allows their very diverse implementation in control cabinet and
control engineering.
The sizes SENTRON 3NP4 LV HRC 000
1)
and LV HRC 00 can be
snapped onto 35 mm standard mounting rails and are ideal for
combining with other switching devices e.g. in capacitor modules
for p.f. compensation.
The SENTRON 3NP4 and 3NP5 fuse switch disconnectors are
used in conjunction with SITOR semiconductor fuses for the
effective protection of frequency converters and soft starters
(
see chapter "SITOR semiconductor fuses")
.
1)
Corresponds to the fuse size LV HRC 000 according to IEC 60269-2.
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Benefits
•
The SENTRON 3NP4 and 3NP5 fuse switch disconnectors
comprise a base and a removable fuse carrier with view and
measuring window. The fuse links can be replaced without
tools. This considerably facilitates installation
•
The three conducting paths in the base and the fuse links in
the fuse carrier are separated by partitions that overlap when
opening and closing the device. This type of failsafe protection
is called "complete compartmentalization" and effectively
prevents phase arcing.
•
SENTRON 3NP5 fuse switch disconnectors are also equipped
with locating springs, which are fitted to the side of the base.
These enable the "high speed closing" of devices, regardless
of the actuation speed of the operator.
•
The SENTRON 3NP4 and 3NP5 fuse switch disconnectors are
used with LV HRC fuse links of sizes LV HRC 000 to LV HRC 3
according to IEC 60269-2 and DIN VDE 43620. SITOR semi-
conductor fuses can continue to be used for a wide range of
applications.
•
With its LV HRC fuse links, size 000 with a rated current of 125
and 160 A, Siemens offers an extremely compact solution.
© Siemens AG 2008