9
—
3.0 Introduction
The NAL/NALF/VR switch-disconnector system is
based on a modular principle. The basic unit
consists of a frame with insulators and current
carrying elements. Two different types of
operating mechanisms: snap action mechanism
type K or stored spring energy mechanism type A,
can be mounted on the frame. Fuse-bases type F
with or without fuse tripping mechanism, and
earthing switch type E/EB, suitable for both
direct mounting and free standing components,
complete the basic switch-disconnector
equipment. These modules can be easily
configured, according to customer requirements.
Accessories such as shunt trip, auxiliary switches,
motor operation and various systems for manual
operation can easily be added.
The NAL/NALF/VR brand is recognized globally
and over 600,000 switches have been produced
so far. The design is subject to continuous
development to meet changing customer needs.
3.1 Main Product Features
NALF/VR is the ideal solution for the protection
of the majority of faults in modern electrical
networks. It combines NAL/VR, which interrupts
load currents (up to 1250A) and small fault
currents, with the fuse-base (F) for breaking large
short-circuit currents. The NAL switch-
disconnector family meets the following
standards (depends on the product variant and
voltage level):
IEC 62271-1, EC 62271-102, IEC 62271-103, IEC
62271-105 (IEC 420 for NALF 36kV), IEC 62271-304,
IEC 60129, IEC 60254, IEC 60694, IEC 420,
regarding indoor switches for general use and for
safe switching coordination between switch-
disconnectors and a current limiting fuse.
NAL meets requirements of IEC 62271-1 p. 2.1
Normal service conditions.
The NAL version for IEEE applications is called
VersaRupter. It meets IEEE Standard No. C37.20.4.
The specified NAL/NALF switch-disconnectors
are listed as certified by the Canadian Standard
Association.
Some VersaRupter styles are UL listed, in terms of
compliance with relevant safety requirements, in
order of their release for use in each region of the
US and installations carried out in accordance
with the UL standard.
To Next Page
Loading...
