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Industrial Control Transformers
Application
55
08/2005
© 1999–2005 Schneider Electric All Rights Reserved
APPLICATION
In preparation for connecting power to the primary side of dual voltage
single-phase transformers, it's necessary to first wire the two windings in
either series or parallel to match the incoming voltage. An example of this is
common transformers with a primary voltage description of 240 x 480. The
windings are rated for the lower of the two voltages show on either side of
the 'x'. Connecting the windings in series allows for the higher of the two
voltages. Connecting the windings in parallel allows for the lower of the two
voltages.
Example of Series and Parallel Connections
Parallel Connections
Series Connections
Jumper
Jumper
Jumper Jumper
Jumper
Jumper
H4
X1
H2H3
X3X2
H1
X4
H4
X1
H2H3
X3X2
H1
X4
NOTE: This diagram is for illustration
purposes only. Actual units will have
different combinations. See diagrams for
actual connections.