15
UMG 103
m
m
m
Power supply voltage
The power supply voltage required for
operation of the UMG103 is drawn from
the L1-N, L2-N and L3-N measuring-
circuit voltages. At least one phase must
lie within the rated voltage range.
The UMG103 requires a voltage of at
least 100 Veff in at least one phase (L-N)
to operate.
The connection leads for the measuring-
circuit and power supply voltage must be
routed via a disconnector and protected
with a fuse.
Important!
- A disconnector or circuit-
breaker must be provided for
the measuring-circuit and power
supply voltage in the building
installation.
- The disconnector must be
installed near the device and
must be easy for the user to
reach.
- The switch must be labelled
as a disconnecting device for
this device.
Voltages which are above the
allowable voltage range can
destroy the device.
Before applying the measuring-
circuit and power supply
voltage, ensure that the voltage
and frequency matches the
information given on the rating
plate!
