Product Description
Three-phase 3-conductor systems
The UMG604 can be used in unearthed three-
phase 3 conductor systems (IT system). The
conductor to conductor voltage may not
exceed 480V AC (50 Hz, 60 Hz).
The UMG604 is only suitable for environments
in which the impulse voltage withstand
level of 4 kV (overvoltage category III) is not
exceeded.
In the IT system the neutral point (star point)
of the voltage generator is not earthed. The
bodies of the electrical system are earthed.
Earthing via high-resistance impedance is
allowed.
IT systems are only allowed in certain systems
with their own transformer or generator.
U
L-L
66 V
115 V
120 V
127 V
200 V
230 V
240 V
260 V
277 V
347 V
280 V
400 V
415 V
440 V
480 V
Fig. 16.1 Table of the suitable rated voltages.
Typical rated voltage
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