P-164000249
30-200 kW
19
Revision 2
User's and Installation Guide
2.5 Options and accessories
Contact an Eaton sales representative for information about the available options.
2.5.1 Maintenance Bypass Switch
The Maintenance Bypass Switch (MBS) enables power to completely bypass and isolate the UPS so
that the UPS can be safely serviced or replaced without interrupting power to critical systems.
An internal maintenance bypass switch is provided as a factory installed option for 30-150 kW units.
Alternatively, MBS solutions are also available in external enclosure as accessory items.
External Maintenance Bypass Switch Panel
The external MBS is enclosed in its own separate cabinet, and it can be either a wall-mounted or
stand-alone cabinet depending on the MBS power rating. The MBS wiring has two different options:
two- and three-switch configuration. The two-switch model contains a Maintenance Isolation Switch
(MIS) and a Maintenance Bypass Switch (MBP). The three-switch model contains a Bypass Input
Breaker (BIB) in addition to a MIS and an MBP.
The two-switch model assumes that the UPS rectifier and bypass are coupled through dedicated
breakers and separate cables from the switchgear. However, the three-breaker model can be
connected to the switchgear with only a single cable, and the cable connections between the panel
and UPS are run separately.
For more information, see
Figure 2-8: Two-switch MBS electrical connection drawing
on page 20
and
Figure 2-9: Three-switch MBS electrical connection drawing
on page 21.
