Indoor Air Switch-disconnector, NAL/NALF
Rated voltage: 12, 17.5, 24 and 36 kV
Rated current: 400/630, 800 and 1250 A
Mounting and operation manual
The NAL family of switch-disconnectors is characterized
by its compact, modular design and broad functionality. With
their unique design for extinguishing the electric arc and high
switching capacity, they represent an attractive solution, as main
switching apparatus for applications in enclosed switchgear and
compact transformer stations. In combination with CEF current
limiting fuses, they provide reliable control over the full range of
overload currents.
Main areas of application NAL switch disconnectors:
– as line and transformer switches within distribution networks,
– as motor switches,
– as capacitor switches.
Introduction
The NAL/NALF 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 monting 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, under-voltage release, auxiliary
switches, motor operation and various systems for manual operation
can easily be added.
The NAL/NALF brand is recognised globally and more than 600,000
switches have been produced so far. The design is subject to
continuous development to meet changing customer needs.
Main Product Features
NALF is the ideal solution for the protection of the majority of faults in
modern electrical networks. It combines NAL, which interrupts load
currents (up to 1250A) and small fault currents, with the fuse base (F)
for breaking large short-circuit currents.
This switch-disconnector range meets IEC Publication 60129, 60265,
60694, GOST 1516.3-96, GOST 17717-79, and CSA Standard No.
C22.2, No. 193, and IEC 62271-105, regarding switches for general
use and for safe switching coordination between switch-disconnectors
and a current limiting fuse.
The NAL version for ANSI standard is called VersaRupter. It meets
ANSI 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.