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Site Preparation (UPS and XR) – Operating Environment
AIS® 3000 10-30kVA, 208V, Site Preparation and Installation Manual – 990-1957 19
Recommended current protection
Note 1:
If the available fault current of the installation is below 30kA, a lower kAIC-rated breaker can be
used.
Note 2:
For breaker settings, refer to below table listing available overload currents.
Note 3:
If the available fault current of the installation is less than 1200A for the 10kVA and 15kVA UPS
sizes, and below 2300A for the 20kVA and 30kVA UPS sizes, a breaker (of the same value as for the
bypass input) can be used.
Note 4:
Recommended maximum rating of a single-fuse configuration if the internal bypass is to be protected
during a load short-circuit.
AC output over-current protection and AC output disconnect must be provided by the
customer.
Dual/single
mains
configuration
Connection 10kVA 15kVA 20kVA 30kVA Notes
Single Mains/bypass
input
35A breaker
(30 kAIC)
60A breaker
(30 kAIC)
80A breaker
(30 kAIC)
125A breaker
(30 kAIC)
Dual Mains input 35A breaker
(30 kAIC)
60A breaker
(30 kAIC)
80A breaker
(30 kAIC)
125A breaker
(30 kAIC)
1,2
Dual Bypass input 35A breaker
(30 kAIC)
60A breaker
(30 kAIC)
80A breaker
(30 kAIC)
125A breaker
(30 kAIC)
1,2
Any Output 35A fast-
acting class
J fuse
60A fast-
acting class
J fuse
80A fast-
acting class
J fuse
125A fast-
acting class
J fuse
3,4