Medidores de aislamiento - Megohmetros Digitales VDC GigaOhmios 6213-IN SEW manual ingles www.viaindustrial.com
Medidores de aislamiento - Megohmetros Digitales VDC GigaOhmios 6213-IN SEW manual ingles www.viaindustrial.com
MEASURING THE INSULATION OF A CONTACTOR OR CIRCUIT BREAKER
Contactor
or
Circuit
breaker
are
switching
devises
which
when
closed,
must
do
a
good
contact
(have
the
lowest
resistance
possible)
and
when
open,
must
be
a
good
insulator
(have
the
highest
resistance
possible).
As
they
get
older,
their
characteristics
may
deteriorate
due
to
many
factors.
Their
material
properties
may
deteriorate
with
time
and
frequency
use
as
well
as
stress
put
on
to
them.
One
of
the
factor
we
will
be
testing
is
their
insulation
when
acting
as
an
open
circuit.
Contactors
or
circuit
breakers
may
also
get
dirty
as
they
are
utilized
in
heavy
duty
environments,
like
factories,
mines
etc..,
Which
have
climatic
conditions
which
are
harch.
When
they
are
dirty,
their
insulation
may
deteriorate
due
to
the
deposit
of
matters
between
the
terminals
(see
previous
page
about
parasitic
resistance
due
to
dirt
contamination).
The
Contactor
or
Circuit
Breaker
must
not
be
connected
to
any
live
component
or
power
source
during
its
testing.
-22-
