Specifications

Smart-UPS® VT ISX w/transformer, 20-30 kVA, 480 V, Installation
Pins 1 to 4 are for battery measurement (only applicable to APC XR
Enclosures).
Pins 5 and 6 are for external maintenance bypass Q3 (auxiliary switch
N/C type). When Q3 is closed, signals are fed back to the UPS controller.
Pins 7 and 8 are for external charge control. When 7 and 8 are closed, the
UPS charges batteries with a pre-defined percentage (0-25-50-75-100%)
of the maximum charging power. To be used in generator applications, or
if special codes requires control of charging.
When Q3 is closed, signals are fed back to the UPS controller.
Connection of APC communication options
(PowerChute software and temperature sensor)

Feed cables from optional communication equipment through the
opening in the top cover.

Guide the cables along the inside of the left side panel down to the
opening in the power module frame.

Attach communication equipment where shown.
Note
When connecting the Q3 auxiliary signal, use gold-plated N/C
auxiliary switch on Q3.
Note
The APC communication options are provided at the front of
the UPS.
10/100Base-T
Probe
AP9619 Network Management Card EM
!
Reset
Output
Pwr
Zone
10/100
M
o
d
el
:
Seria
l
:
Se
ria
M
odel:
Se
r
ial:
BATTERY UNIT
M
o
del:
Serial:
BATTERY UNIT
M
odel:
Serial
:
BATTERY UNIT
Model:
Serial:
BATTERY UNIT
Model:
Serial:
BATTERY UNIT
Mode
l
:
Seria
l
:
BATTERY UNIT
Model:
Serial:
BATTERY UNIT
Model:
Serial:
BATTERY UNIT
Model:
Serial:
BATTERY UNIT
Model:
Serial:
BATTERY UNIT
Model:
Serial
:
BATTERY UNIT
Model:
Serial:
BATTERY UNIT
10/100Base-T
Probe
AP9619 Network Management Card EM
!
Reset
Output
Pwr
Zone
10/100
Temperature sensor/
PowerChute software
Temperature
sensor
PowerChute



5
Specifications
Recommended current protection
To ensure the correct functionality of the PDU and to avoid
unintentional tripping of the bypass input protection device follow
the following recommendation:
Use the SUVTOPT114 (20kVA version) or the SUVT115 (30kVA
version) as input protection.
Output protection is included in the PDU of the unit.
Note: Be aware that for single mains this is also the mains input
protective device.
Note: Using a solution solely based on breakers, selectivity for load short
circuit currents higher than 2kA cannot be assured for the 3-phased
output. If this is required, use fuses to protect the bypass.
UPS ratings 20 kVA 30 kVA
Input voltage / Bypass
voltage (V)
per phase
480 480
Input current (nominal) (A) 25.5 36.8
Input frequency (Hz) range 60 60
Output voltage (on line). (V)
Minimum and maximum values
(± 1%)
3x208 3x208
Output current (nominal,
per phase) (A)
55.5 83.3
Maximum output current
(in bypass only at 110%
overload per phase)
61.1 91.6
Neutral output current
(with 100% switch mode load)
(A)
37.5 56.7
UPS size Fuse type
20 kVA version 208 V input voltage 40 A Class J time delay fuse
30 kVA version 208 V input voltage 50 A Class J time delay fuse
Smart-UPS® VT ISX w/transformer, 20-30 kVA, 480 V, Installation
If fuses are preferred, the following can be used:
Ensure that the short-circuit current on the UPS input is less than 20AiC
sym RMS. Also take into consideration the below breaker settings to
ensure correct functionality during overload operation.
UPS size Breaker/fuse
20 kVA version 480 V input voltage 40 A
30 kVA version 480 V input voltage 50 A
Note
Breakers/fuses other than APC SUVTOPT need complete
selectivity assessments.