Eaton 9EHD Series, User'S Installation And Operation Manual

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Eaton 9EHD-33-40/20
80% Derated 36A
40A 10200
100% Rating 29A
Eaton 9EHD-33-40/30
80% Derated 54A
63A 10200
100% Rating 43A
Eaton 9EHD-33-40/40
80% Derated 73A
80A 20400
100% Rating 58A
Table 3-8 recommended Bypass Circuit Breaker, output Circuit Breaker and Bypass fuse Parameters ratings
There is no DC disconnect device within the UPS. A battery disconnect breaker 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 breaker 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 9EHD-33-40/20
80% Derated 58A
100% Rating 46A
Eaton 9EHD-33-40/30
80% Derated 86A
100% Rating 69A
Eaton 9EHD-33-40/40
80% Derated 115A
100% Rating 92A
Circuit Breaker rating
fuse Parameters
uPS model load derating 400V
Current/min I2T a2Sec/max
Eaton 9EHD UPS (20-40 kVA, 380/400/415V) Installation and Operation Manual 18