Table 3-8 Recommended Bypass Circuit Breaker, Output Circuit Breaker And Bypass Fuse Parameters Ratings; Table 3-9 Recommended Dc Input Circuit Breaker Rating - Eaton 9EHD-33-40/20 User's Installation And Operation Manual

Table 3-8 recommended Bypass Circuit Breaker, output Circuit Breaker and Bypass fuse Parameters ratings

uPS model
Eaton 9EHD-33-40/20
Eaton 9EHD-33-40/30
Eaton 9EHD-33-40/40
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.

Table 3-9 recommended dC input circuit breaker rating

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.
18 Eaton 9EHD UPS (20-40 kVA, 380/400/415V) Installation and Operation Manual
Circuit Breaker rating
load derating
80% Derated
100% Rating
80% Derated
100% Rating
80% Derated
100% Rating
uPS model
Eaton 9EHD-33-40/20
Eaton 9EHD-33-40/30
Eaton 9EHD-33-40/40
Current/min
400V
36A
29A
54A
43A
73A
58A
Circuit Breaker rating
load derating rated battery voltage (480V, 40 sections)
80% Derated
100% Rating
80% Derated
100% Rating
80% Derated
100% Rating
fuse Parameters
I2T a2Sec/max
40A 10200
63A 10200
80A 20400
58A
46A
86A
69A
115A
92A