34001813EN/AE - Page 61
7. Appendices
Electrical characteristics

Selection of protection devices

UPS short-circuit current with inverter coupled and By-pass AC source out of tolerances:
UPS unit with common normal and Bypass AC inputs
UPS unit with separate normal and Bypass AC inputs
When sizing the upstream circuit breakers, the parameters presented below must be taken into account:
Time/current curves for UPS input and output fuses:
Sn 20 kVA 30 kVA 40 kVA 60 kVA 80 kV A 100 kVA 120 kVA
In 29 A 43 A 58 A 87 A 115 A 144 A 173 A
Limitation 190 A 190 A 190 A 240A 360 A 480 A 480A
14
Q1
16
Q4S
Q5N
15
Normal AC
Bypass AC
Upstream
circuit breaker
(not supplied)
Downstream
circuit breaker
(not supplied)
Output
fuses
Input
fuses Load
14
Q1
16
Q4S
Q5N
15
Upstream
circuit breaker
(not supplied)
Downstream
circuit breaker
(not supplied)
Normal AC
Bypass AC
Upstream
circuit breaker
(not supplied)
Output
fuses
Input
fuses Load
104
103
102
10

1

10
-
1
10
-
2
10
-
3
10
-
4
104
103
102

10 I (A)

t (s)

80 kVA : 160A
100-120 kVA : 315A
60 kVA : 125A
20-30-40 kVA : 80A