Figure 6-17. Simplified Dual-Feed Ups With Maintenance Bypass Panel - Eaton Power Xpert 9395P-900 Series Installation And Operation Manual

Understanding UPS Operation
RIB: Rectifier Input Breaker
BIB: Bypass Input Breaker
MIS: Maintenance Isolation Breaker
MBP: Maintenance Bypass Breaker
NOTE If installing a maintenance bypass, 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 or rectifier input breaker (RIB) (if installed) and one for the maintenance bypass
input. DO NOT use a single feed or a single feeder breaker to supply both the UPS or RIB and the maintenance bypass. If a bypass input
breaker (BIB) is installed in the maintenance bypass and a single-feed UPS is being installed, a single feed to the maintenance bypass is
acceptable for supplying both the UPS and the bypass.

Figure 6-17. Simplified Dual-Feed UPS with Maintenance Bypass Panel

®
6-22 Eaton Power Xpert
To UPS To UPS
Rectifier Bypass
Input Input
RIB
BIB
Output
from
UPS
Static
Switch
®
9395P-900 UPS Installation and Operation Manual P-164000501—Rev 09
AC Input AC Input
MBP
MIS
MAINTENANCE
BYPASS PANEL
(Supplied by Others)
Backfeed
Contactor
K5
Output
K3
Contactor
UPS
Battery
Breaker
BATTERY SYSTEM
CRITICAL LOAD
DISTRIBUTION UNIT
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