2-16
System power
Main system
power
The 4010ES FACP is powered primarily by the MSS. The MSS draws power from the main
power line, via an AC block, a transformer and a rectifier (Figure 2-5). In the case of main
power failure, backup power is provided by backup batteries.
Backup batteries A pair of 12V sealed lead acid batteries are used as a backup power source in the event of AC
failure. The backup batteries are ordered and shipped separately from the 4010ES system. They
are installed at the bottom of the 4010ES back box.
Batteries larger than 33 Ah for a one-bay 4010ES and 50 Ah for a two-bay 4010ES can be
used. However, they must be accepted and installed per UL and local authority requirements
using 4100-5128 Battery Distribution Terminal Block. The connection from the battery box to
the 4010ES panel must be within 20 feet and in conduit.
For 50 Ah external batteries with a one-bay box, use box 2081-9282 Remote Battery Cabinet
(Red). For 110 Ah external batteries with a one or two-bay box, use box 2081-9280 Remote
Battery Cabinet (Red).
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