14
UMG 104
Three-phase 4-wire systems
The UMG104 can be used in three-phase
4 conductor systems (TN, TT system) (50 Hz,
60 Hz) with earthed PEN conductor. The
bodies of the electrical system are earthed.
The conductor to neutral conductor voltage
may not exceed 300 V AC.
The UMG104 is only suitable for environments
in which the impulse voltage withstand level of
4 kV (overvoltage category III) is not exceeded.
Fig. 14.1 Table of rated volt-
ages of the grid suitable for
the voltage inputs.
U
L-N
/ U
L-L
66 V / 115 V
120 V / 208 V
127 V / 220 V
220 V / 380 V
230 V / 400 V
240 V / 415 V
260 V / 440 V
277 V / 480 V
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