Installation manual

Prerequisites >
34020846EN/AE - Page 19
1. Installation
Recommended maximum downstream protection
Battery protection
Pn = rated power at a power factor of 0.9; for other values, please consult the after-sales support or the local office.
See the necessary precautions during connection of circuit breakers / switch-disconnectors in the installation
manual of the battery circuit-breaker enclosure, doc. no. 34021529.
Recommended residual-current protection
If these recommendations are not followed, a short-circuit on an output circuit can result in a break in power longer than 20
ms on all the other output circuits.
UPS cabinets in kVA CB/switch-disconnector Trip unit
160 - 200 NSX 100N
C120N
C120N
TM D 63
C63
B 100
250 - 300 NSX 100N
C120N
C120N
TM D 80
C 80
B 125
400 NSX 100N
NG 125N
C 125H
TM D 100
C 125
C 125
500 C125N
NSX 160N
NG 125N
D 125
TM 160D
D 125
Depending on the installation, the CB/SD may be replaced by a CB/SD with a higher breaking capacity.
These protective devices ensure discrimination for each circuit downstream of the UPS, with or without a bypass AC input.
UPS cabinets in kVA Battery backup time at
Pn
Battery CB/switch-disconnector QF1
Type Trip unit Magnetic setting in A
160 All NS 400 or
NS 630 DC
MP1 800
200 All NS 400 or
NS 630 DC
MP1 800
250 All NS630 DC MP1 1200
300 ≤ 15 min
> 15 min
NS630 DC
C1251N DC
MP1
P21
1200
1600
400 ≤ 5 min
> 5 min
NS630 DC
C1251N DC
MP1
P21
1200
1600
500 All C1251N DC P21 1600
Requirements for residual-current protection:
For common normal and bypass AC inputs:
- The same residual-current protection may be used for the two lines.
For separate normal and bypass AC inputs:
- A transformer is required upstream of either the normal AC line or the bypass AC line.
- Equip each line with a circuit breaker or switch-disconnector with residual current protection.
See “System earthing arrangements”, page 24.
The recommended minimum residual current protection is 3A, provided the conditions defined in IEC364.4-41 are
respected.