User Documentation

2. Functional description
Current transformers in the KBU series are inductive single-wire
current transformers that operate on the transformer principle. They
are used to adapt the primary measuring parameter to the input rated
parameters of the connected measuring equipment.
As a result of the measuring principle used, these current transformers
are only suitable for use on alternating current networks.
The KBU series is suitable for installation both on insulated and un-
insulated primary conductors.
3. Warning information
WARNING
Dangerous electrical voltage can cause electric shock and burns.
Ensure that the information on the type plate and in the "Technical
data" under Point 7 matches the operating parameters of the system.
Before starting any installation work, disconnect the system from the
power supply!
WARNING
If there is an unladen (open) secondary circuit in the current
transformer, high voltages will be induced at its secondary terminals.
The voltage values that occur there represent a danger to persons
and to the functional safety of the current transformer.
"Open mode", i.e. operation of the current transformer without
secondary circuitry, must be avoided at all costs.