Introduction
3.
Product Guide
VISI-SWITCH
®
NOJA Power’s VISI-SWITCH
®
is an enclosed three
phase load break switch with visible isolation. It is used
to isolate sections of feeders for maintenance work so
that work can be carried out in a safe manner.
The VISI-SWITCH
®
includes an isolator and
vacuum interrupter for each phase that are serially
interconnected for load break application. A mechanical
driving mechanism is provided for driving open and
closed each pair of electrical contacts and is configured
to control the sequence of the opening and closing of
the contacts. The vacuum interrupter is opened first
to break current flow and then after a short delay the
isolators are opened to disconnect the electrical circuit.
When closing, the isolator closes first and then the
vacuum interrupter, making the current.
The operator can manually open and close the contacts
of both the isolator and interrupter from the ground
with a single motion using either an extended hook
stick which reaches directly to the switch or a shorter
hook stick which connects to an insulated down rod
extending from the switch.
The advantage of the switch is that the operator can
view the isolator contacts through the viewing window,
thereby readily determining the state of the switch from
the ground. In particular, the operator can confirm that
there is a visible break i.e. the contacts are open and
that the associated circuit is safely isolated.
The switch includes isolator bushings in which the
electrical isolator contacts are located, a metal tank in
which the driving mechanism is located, and interrupter
bushings in which the interrupter contacts are located.
The bushings and the tank are sealed together and
impede the ingress of moisture thereby suiting the
assembly to outdoor use. The tank is manufactured
from powder coated stainless steel and is arc-fault
vented. It has a 30 year operating life and the entire
device is rated to IP65.
OVERVIEW
VISI-SWITCH
®
FRONT VIEW
VISI-SWITCH
®
VISIBLE ISOLATOR
OPEN STATE
VISI-SWITCH
®
VISIBLE ISOLATOR
CLOSED STATE
