ELECTRICAL INSTALLATION
Eaton FERRUPS Rack Mount UPS (850 VA–7 kVA) Installation Guide
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164201425 Rev 1
www.eaton.com/powerquality
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Bypass switches may be Make-Before-Break (MBB) or
Break-Before-Make (BBM).
An MBB switch makes a new connection before it breaks the original
connection (see Figure 31). For example, if you turn an MBB switch
from UPS to LINE, the bypass switch connects the load to AC input
power before disconnecting the load from UPS output power.
NOTE
MBB switches are not for use with 208 Vac.
Figure 31. Make-Before-Break Bypass Switch
A BBM switch breaks the original connection before it makes a new one
(see Figure 32). If you turn a BBM switch from UPS to LINE, the switch
disconnects the load from UPS output power before connecting the load
to AC input power.
Figure 32. Break-Before-Make Bypass Switch
Summary of Contents for FERRUPS
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