UNDERSTANDING MBM OPERATION
Eaton 9395 Maintenance Bypass Module Installation and Operation Manual
S
164201719 Rev 3
www.eaton.com/powerquality
5-6
Battery
Breaker
Input
Breaker
(CB1)
(optional)
E1, E2, E3
E6, E7,
E8, E12
NOTE
Callout letters
A
,
C
,
D
, and
E
map to Table 3‐4 on page 3-6, Table 3‐5 on page 3-7, Table 3‐6 on page 3-8, and Table 3‐7 on page 3-9.
NOTE
The
UPS is shown in a simplified view and does not show multiple UPMs.
NOTE
When installing an MBM, a minimum of two separate feeds with upstream feeder breakers, or a single feed with two upstream feeder breakers, must
be provided: one for the UPS and one for the maintenance bypass input. DO NOT use a single feed or a single feeder breaker to supply both the UPS and the
maintenance bypass.
NOTE
If the load requires a neutral, a bypass source neutral must be provided.
9395 UPS CABINET
Backfeed
Contactor (K5)
E9, E10,
E11, E12
Static
Switch
AC Input to
UPS Rectifier
3 Wire A-B-C
Rotation
Fuse
Service Connector
Battery
Converter
Inverter
Output
Contactor
(K3)
Fuse
Rectifier
Input
Contactor
(K1)
Battery Contactor (K2)
Fuse
Fuse
Fuse
E4. E5
BATTERY
CABINET
or
BATTERY
STRING
(Not supplied
with the UPS)
MBM
Maintenance
Bypass Breaker
(MBP)
Maintenance
Isolation Breaker
(MIS)
Bypass Input
Breaker (BIB)
A
C
E
AC Output to
Critical Load
AC Input to
Maintenance Bypass
3 or 4 Wire A-B-C
Rotation
E13, E14,
E15, E12
E1, E2,
E3, E12
D
BIB-1,
BIB-2,
BIB-3,
E12
MIS-1,
MIS-2,
MIS-3,
E12
Figure 5‐4. Eaton 9395 MBM with BIB – Dual-Feed UPS