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Product overview
On the voltage measurement side, a KL3403 is equipped with a protection impedance of 500 kΩ. If the
neutral conductor is not connected and only one connection on the side of the voltage measurement is live,
the resulting voltage against earth in a 3-phase system with a phase-to-phase voltage of 400 V
is 230 V
.
AC
AC
This should also be measured on the side of the current measurement using a multimeter with an internal
resistance of 10 MΩ, which does not represent an insulation fault.
Additional measuring instruments in the current circuit
Please note that the addition of additional measuring instruments (e.g. ammeters) in the current circuit can
lead to a significant increase in the total apparent power.
Furthermore, connection I
of the KL3403 must represent a star point for the three secondary windings.
N
Additional measuring instruments therefore have to be potential-free and must be wired accordingly.
KL3403
Version: 3.1.0
21
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