UPS Installation Plan and Unpacking
Eaton 93E UPS (300/400 kVA, 380/400/415V) Installation and Operation Manual 3-9
Table 3-8. Recommended Bypass and Output Circuit Breaker Ratings
Circuit Breaker Rating
UPS Model Load Derating 400V
Eaton 93E-400/300 80% Derated
541A
100% Rating
433A
Eaton 93E-400/400 80% Derated
721A
100% Rating
577A
The line-to-line unbalanced output capability of the UPS is limited only by the full load per phase current values
for AC output to critical load shown in Table 3-5. The recommended line-to-line load unbalance is 50% or less.
With non-linear load, neutral current may reach 1.7 times of phase current.4 pole breaker rating shall be
sufficient in this case considering the neutral current.
Readily accessbible disconnect devices (Bypass and output overcurrent protection and bypass and output
disconnect switches) are to be supplied by the customer. Table 3-8 lists the recommended rating for bypass
and output circuit breakers.
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 breaker 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.
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.
Table 3-9. Recommended DC input circuit breaker rating
Circuit Breaker Rating
UPS Model Load Derating Rated battery voltage (480V, 40 sections)
Eaton 93E-400/300 80% Derated
772A
100% Rating
618A
Eaton 93E-400/400 80% Derated
1030A
100% Rating
824A
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