janitza CT27 User manual
Technical Specifications
Safety and environmental conditions
CE marking LV directive 2014/35/EU
RoHS directive (EU) 2015/863
Standard EN-IEC 61010-1:2010
WEEE directive 2012/19/EU
This product is designed to be safe under the following conditions:
Location Indoor use
Altitude Up to 2000m (1.24mi)
Ambient temperature -10°C to +55°C (14°F to 131°F)
Storage temperature -20°C to +70°C (-4°F to 158°F)
Relative humidity 5% to 85%, non condensing
Pollution degree 2
Degree of protection IP20
The CT27 is only suitable for insulated primary conductors.
Specifications
Standard IEC 61869-2:2012
Rated short-time thermal
current (Ith)
60 x Ipr / 1s
Rated dynamic current (Idyn) 2,5 x Ith
Continuous thermal current
(Icth)
100%
Rated insulation level 0,72/3/- kV
Rated frequency 50/60Hz
Class of insulation A (105 °C / 221 °F)
Secondary terminal Female clamping connector,
suitable for conductor size:
0,2 to 1,5mm² solid, stranded
or ferruled (Strip length 8 to
9mm) (0.315 to 0.354in)
Specifications per type
CT27
Secondary
leads format*
0,5mm2
max. 1,4m
(55in)
0,75mm2
max. 2,0m
(79in)
1,0mm2
max. 2,8m
(110in)
1,5mm2
max. 4,0m
(157in)
Suitable for
cable ø 7,5mm (0.295in)
Approximate
weight 40g (0.088lb)
* Maximum length secondary leads for 0,1VA at the end of this leads.
Janitza electronics GmbH reserves the right to carry out modifications on
its products, in order to improve them, without prior notice.
CT27 Current Transformer
Installation Guide
Janitza electronics GmbH
Vor dem Polstück 6
35633 Lahnau | Germany
Support +49 6441 9642-22
Doc. No. 2.002.160.1.a | Issue date 06/2022
Subject to technical alterration
Explanation of symbols
This product is designed according to the EN-IEC
61010-1:2010 standards and therefore this product
meets the requirements of the Low Voltage Directi-
ve 2014/35/EU.
Read the installation guide before mounting the
product. Unprofessional work activities on electrical
installations may result in a threat of danger to the
life and health of human beings and livestock!
Under no circumstances the secondary circuit of
the CT may be opened when the CT is mounted
on a primary current and current is flowing in the
primary circuit. High voltages may appear on the
secondary leads when this circuit is left open.
RoHS Directive (EU) 2015/863
Janitza electronics GmbH states that they only uses
qualified component in their products from ma-
nufacturers, whose specifications meet or exceed
the requirements of the European Directive for the
Restriction of use of certain Hazardous Substances.
WEEE Directive 2012/19/EU
The ‚crossed out wheeled bin‘ symbol indicates
that the equipment should not be disposed as un-
sorted municipal waste. Contact a qualified recycler
for disposal.
CT27-35
CT27-64
General
The CT27 is a current transformer and can only be used measuring
electrical alternating currents. The CT27 is suitable only for moun-
ting on insulated primary conductors in a weather protected and
dry location.
Read this installation guide before installing the product.
WARNING
Risk of injury due to electric voltage or electrical current!
When handling electrical currents or voltages, serious personal
injuries or death can occur due to:
· Touching live exposed or stripped cores.
· Device inputs that are dangerous to touch.
Before starting work on your system:
• Disconnect it from the power supply!
• Secure it against being switched back on!
• Verify disconnection from power!
• Ground and short circuit!
• Cover or block off neighboring parts that are under
voltage!
Mounting instruction
Tools are only required connecting the primary cable running
through the Current Transformer. To connect the CT to the meter
correctly, please consult the installation guide of the meter.
Assembly
Under no circumstances the secondary circuit of the CT may be
opened when the current is flowing in the primary circuit. High
voltages may appear on the secondary leads when this circuit is
left open.
1. Ensure a safe working area during assembly, maintenance and
inspection of the CT. Disconnect the power of the primary circuit
and make sure it can not be enabled unintentionally.
2. Find the power direction of the cable you want to measure. It
is recommended to mount P1 side to power source and P2 side
to power consumer. If so the arrow on the CT will indicate the
direction of power flow.
3. Mount the CT on the cable. The CT27 can be mounted stand-
alone and clicked on each other. Optional: screw mounting or
mounting on a DIN-rail via the mounting clip (Snap-on mounting)
(09.09.010).
4. Reinstall the primary conductor.
5. Connect the secondary leads (S1, S2) to the low impedance
current input of the measurement instrument (e.g., an ammeter
or current input of kWh-meter). For more information about the
secondary leads, please consult the specifications table under
‘Technical Specifications’.
6. Check if the CT is mounted properly. Check if the secondary
leads are connected properly and firmly.
7. Enable the primary circuit.
Wiring Diagram
Accuracy
The CT may not meet its accuracy specification when the secon-
dary burden is to high. For example due to a secondary cable
which is too long or too thin.
Maintenance and inspection
• Check whether the secondary leads are connected firmly.
• Check whether the CT is mounted firmly.
• Remove severe pollution on the casing.
Problem solving
Unexpected values, incorrectly values, reversed power
• Check the settings of the meter by using the installation guide
of the meter.
• Check whether the CT is mounted on the intended cable in the
right direction.
• Check the value of the secondary burden (secondary leads
length/diameter and meter impendent). See product/data sheet
for the maximum burden value.
Attention
Always follow the disassembling instructions when reversing the
CT.
Qualified personnel
To prevent personal injuries and property damage, only qualified
personnel with electrical engineering training may work on the base
unit and its components. They must also have knowledge
• of the national accident prevention regulations.
• of safety technology standards.
• in the installation, commissioning and operation of the device
and the components.
Temporarily disconnecting the CT
The secondary leads of the CT always have to be connected
to a low impedance burden such as an ammeter. When, during
maintenance, no burden is available to connect to, the secondary
leads of the CT (the two secondary terminals) must be short-cir-
cuited.
P1 P2
S1 S2
primary conductor
Disassembly instruction
Tools are only required disconnecting the primary cable running
through the CT27. To disconnect the meter from the CT, please
consult the installation guide of the meter.
1. Ensure a safe working area during disassembling the CT. Dis-
connect the power of the primary circuit and make sure it cannot
be enabled unintentionally.
2. Dismount the CT from the primary conductor.
3. Disconnect the secondary leads from the measurement
instrument.
Recycling
When the product has reached ‘end of life’, it must be recycled.
Do not dispose this product as unsorted municipal waste. Contact
a qualified recycler for disposal.
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