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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
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