Table 3-9. Recommended Dc Input Circuit Breaker Rating - Eaton 93E UPS Installation And Operation Manual

UPS Installation Plan and Unpacking
There is no DC disconnect device within the UPS. A battery disconnect switch is recommended, And may be
required by local codes when batteries are remotely located. The battery disconnect switch should be installed
between the battery and the UPS
External DC input overcurrent protection and disconnect switch for the remote battery location is to be
provided by the user. Table 3-9 lists the maximum rating for continuous-duty rated circuit breakers satisfying the
criteria for both.

Table 3-9. Recommended DC input circuit breaker rating

UPS Model
93E-15
93E-20
93E-30
93E-40
93E-60
93E-80
Battery voltage is computed at 2 volts per cell. Rated battery current is computed at 2 volts per cell. The battery
wiring used between the battery and the UPS should not allow a voltage drop of more than 1% of nominal DC
voltage at rated battery current. If the conductors used for DC input from the battery cabinets to the UPS are
those provided by the UPS manufacturer, and the UPS and battery cabinets are manufactured by the same
supplier, then it is acceptable if they do not meet the noted minimum conductor sizes.
3-20 Eaton 93E UPS (15-80 kVA, 380/400/415V) Installation and Operation Manual
Circuit Breaker Rating
Rated battery voltage
Load Derating (DC 432V, External battery 36 blocks)
80% Derated
100% Rating
80% Derated
100% Rating
80% Derated
100% Rating
80% Derated
100% Rating
80% Derated
100% Rating
80% Derated
100% Rating
(DC 384V, Internal battery 32 blocks)
43A
34A
57A
46A
86A
69A
114A
92A
172A
137A
229A
183A
Rated battery voltage
48A
39A
64A
52A
97A
77A
129A
103A
193A
155A
258A
206A