LIEBERT NX BATTERY CIRCUIT BREAKER BOX
Installation Instructions
Installation
The Liebert Battery Circuit Breaker box is required to protect the battery from overcurrents. It also
provides electrical isolation between the UPS and the battery, permitting personnel to reduce the
risks involved in maintenance work to a minimum.
Two battery circuit breaker boxes, which differ only in switch capacity, are available for installations
where the battery is not installed in the battery cabinet. In those cases, the appropriate battery box is
fitted as close as possible to the battery and connected to the UPS as shown in illustration on page 2.
The separate circuit breaker box contains the same battery isolating circuit breaker as is mounted in
the battery cabinet.
A separate safety earth must be connected between the UPS unit and circuit breaker box.
Two boxes are available, depending on the UPS power rating:
Batterycircuit breaker box dimensions, switch capacity
UPS
10-15 kVA
20-30 kVA
Dimensions, in. (mm)
H-W-D
32-1/4 x 20-1/4 x 8-1/3
(819.2x514.4x210.8)
Circuit Breaker
70A
125A
Description
The circuit breaker has the following features:
• Short-circuit protection
• Protection against battery cabinet and UPS connection errors (polarity reversal +/-).
1
Battery circuit breaker box connections—70A and 125A
3.86"
97.95mm
5.39"
137mm
CUSTOMER GROUND
.25" STUD FOR
6GA - 2/0 WIRE
.38"
9.53mm
5.39"
137mm
NEUTRAL BUSBAR
3.98"
101.2mm
8.34"
211.72mm
TB1
O .50"
12.7mm
X6
CONDUIT ENTRY
TOP & BOTTOM
3
20.24"
514.21mm
2.62"
66.62mm
15.00"
381mm
(MTG DIM.)
32.25"
819.15mm
31.50"
800.1mm
(MTG DIM.)
ISOMETRIC VIEW W/O TO & COVER
(+)
(GND)
(-)
TB1
(-)
O .31"
7.92mm (TYP. .25" HDWR)
NEUTAL
302
1
2
3
4
5
6
REMOVEABLE
COVER
(+)
NEUTRAL
BUSBAR
.38"
9.53mm
1. HARDWARE FOR CONNECTING CABLES TO THE BREAKER SUPPLIED.
2. "TYPE-1" RATED ENCLOSURE.
3.
303
CONNECT TO UPS MODULE
(FIELD INSTALLED)
LOW VOLTAGE WIRING NEEDS TO ENTER THIS BOX FROM THE TOP.
CIRCUIT
BREAKER
COM BLACK
N.O. RED
N.C. BLUE
4. DC OUTPUT POWER CONNECTIONS WILL ACCEPT (2) POSITIVE AND (2) NEGATIVE
WIRES, ACCEPT 2GA.
(-) (+) (-) (+)
5. DC INPUT CONNECTION WILL ACCEPT 2GA WIRE FOR 10 -15KVA UPS WITH 70A BREAKER,
(-)
(+)
(-)
(+)
OR 20-30KVA UPS WITH 125A BREAKER.
FROM CUSTOMER'S
BATTERY SYSTEM
(FIELD INSTALLED)
(FIELD SUPPLIED)
NOTE
1. The signal cables in this figure must be shielded and double-insulated.
2. Connect the Pes (Protection Earth) of the UPS cabinet and BCB box to the same point.
Liebert Corporation
1050 Dearborn Drive
P.O. Box 29186
Columbus, OH 43229
Telephone: 1-800-877-9222
Facsimile: 1-614-841-6022
www.liebert.com
© 2004 Liebert Corporation
All rights reserved throughout the world. Specifications subject
to change without notice.
® Liebert and the Liebert logo are registered trademarks of
Liebert Corporation. All names referred to are trademarks or
registered trademarks of their respective owners.
SL-25245 (9/04) Rev. 0
2