MGE UPS Systems GALAXY PW 225KVA User Manual
Page 20

1.7
Recommended Protection
1.7.1
Protection Upstream of Galaxy PW™
The information provided here is purely indicative, for a single UPS unit. Check that all the criteria mentioned in the
previous section are taken into account (short-circuit current and protection of the static switch semiconductors on
the bypass AC input).
Table 1-3: Rating Recommended for Devices Upstream of Single UPS.
Ratings
rated UPS
CB on normal
CB on bypass
output
AC input
AC input
in kVA
circuit breaker control unit
circuit breaker
control unit
100
125A
125A
125A
125A
130
160A
160A
160A
160A
150
250A
200A
250A
200A
180
250A
250A
250A
250A
200
400A
400A
400A
400A
225
400A
400A
400A
400A
1.7.2
Protection Downstream of Galaxy PW™
These protection devices ensure discrimination for each of the Galaxy PW™ output circuits. If the recommended
downstream protection is not installed and a short-circuit occurs, the result may be a break longer than 20-min on
all the other output circuits.
Table 1-4: Rating Recommended for Devices Downstream of Single UPS.
Ratings
rated UPS
downstream circuit
output
breaker(s)
in kVA
circuit breaker
control unit
100 to 225kVA
100A
63A curve C
100A curve B
Galaxy PW™ UPS 100 to 225kVA
Introduction
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