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Toroidal three-phase Variacs
Variacs are made of high quality parts and have followed
advanced technological studies.
The cooling surfaces have been improved and increased, to
avoid extra heating at the brush contact point with with
the track, even under continuous and heavy use.
The correct use is thus assured for longer periods and
without performance losses.
The Variacs conform to the standards VDE 0552 and
international standards IEC 60989.
The Variacs are designed to be rested
horizontally on a bench.
The single-phase models come with a cable, bipolar led
switch, output connection and protection fuse.
The three-phase models are available with a cable and
Each model has a regulating knob and indication panel of
the output power in percentage.
The Variacs are designed to assure a correct
function up to 40° C. Higher temperatures need a
forced cooling system or a reduction of the Variac's
services by 15% for every extra 10° C (ex.: a 20 A Variac
must be reduced to 17 A max).
No particular maintenance is needed, when the
Variac is used in normal conditions. Periodical
cleaning is required by eliminating dust from the contacts
track, along with a check up of the brush, controlling
that it is intact and long enough to allow a correct
pressure of the spring .
In dirty and salty surroundings, it is advisable to clean
the sampling track with fine sandpaper or a deoxidizer.
If the brush contact is no longer safe and must be
substituted, please do the following:
- with a welder, unweld the the copper cord which gives
current to the brush. Loosen the slider at the output
connector and when the used brush comes off, insert a new
one and reconnect it.
- tighten and adjust the slider two to three mm. from the
sampling track surface.
Connections and Protections
The input power must not exceed 6% of the
nominal, to avoid possible coil over heating.
The output circuit, conform to the standards VDE
0552-5.69, must be protected against voltage overloading
and short circuiting with fuses and thermal protections.
The primary circuit must be protected with a delayed fuse
with correct values for each output.
|Input Power 400 V
|Output Power from 0 to 400 V
Technical sheet download in PDF