© PHOENIX CONTACT 2011-04-04
103359_en_03
INTERFACE
PACT Analog
Data sheet
1Description
The PACT Analog current transformers form a complete
range of bus-bar, plug-in and winding current transformers
for measuring AC currents with a range of 1 A to 4000 A.
Current transformers belong to a group of specialized
transformers and are used in those areas where currents
cannot be measured directly. Depending on the
transformation ratio, the primary current is transmitted to a
smaller electrically isolated secondary current.
PACT Analog current transformers can be used either as an
industrial version or as a transformer that can be officially
calibrated.
1.1 Features
– Safe isolation as a result of the test voltage of 12 kV
(1.2/50 µs) prevents a hazardous operating voltage
from being transferred to downstream components
– Conforms to surge voltage category 3 as a result of the
test voltage amplitude
– Routine test according to EN 50178
PACT Analog current transformers are available in the
following designs:
– Winding current transformer (I
pn
: 1 A to 40 A)
– Bus-bar current transformer (I
pn
: 50 A to 500 A)
– Plug-in current transformer (I
pn
: 50 A to 4000 A)
The calibration process involves additional costs,
which are specified in accordance with the
national table of fees.
Also refer to additional information on "Safe
isolation"; see page 28.
WARNING: Danger due to damaged current transformers
• Before startup, check that the housing of the current transformer is not damaged.
• Also before startup, check that there are no electrically conductive connections between the primary
conductor and the secondary terminals.
• If a built-in current transformer is removed in order to be used in a different system, check the current
transformer for damage again.
WARNING: Danger due to voltage at open circuit
The output of the current transformer is a constant current source. In the event of an increasing load, the output
voltage thus increases and reaches its maximum at infinite load (i.e., with open secondary terminals).
• Avoid open-circuit operation at all costs.
• Note that unloaded transformers must be short circuited.
• Only start up the current transformer once the secondary cables are connected on both sides.
Current transformers
