UPS Installation Plan and Unpacking
Eaton 93PM UPS (20–50 kW, 480V Four Wire – 50 kW Frame) Installation and Operation Manual P-164000540—Rev 4 www.eaton.com/powerquality 3-19
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 3-4. The recommended line-to-line load unbalance is 50% or less.
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 output circuit breakers.
A manual DC disconnect device is provided within the UPS when internal batteries are installed. No manual DC
disconnect device is provided within the UPS when only external batteries are used.
Battery voltage is computed at 2 volts per cell as defined by Article 480 of the NEC. Rated battery current is
computed based on 2 volts per cell.
External DC input overcurrent protection and disconnect switch is to be supplied by the customer. Table 3-9
lists the maximum ratings for continuous-duty rated circuit breakers satisfying the criteria for both.
Recommended disconnect size is based on a maximum full load discharge time less than 3 hours. For longer
discharge times a larger disconnect may be required.
Table 3-8. Recommended Output Circuit Breaker Ratings
Output Rating
UPS Model UPS Rating Load Rating 480V
Eaton 93PM-50-1
Eaton 93PM-50-2 (N+1)
20 kW
80% Rated 30A
100% Rated 25A
Eaton 93PM-50-1
Eaton 93PM-50-2 (N+1)
30 kW
80% Rated 45A
100% Rated 40A
Eaton 93PM-50-1
Eaton 93PM-50-2 (N+1)
40 kW
80% Rated 60A
100% Rated 50A
Eaton 93PM-50-1
Eaton 93PM-50-2 (N+1)
50 kW
80% Rated 80A
100% Rated 60A
Table 3-9. Recommended DC Input Battery Disconnect Circuit Breaker Ratings (240 Cell)
Output Rating
UPS Model UPS Rating 480V
Eaton 93PM-50-1
Eaton 93PM-50-2 (N+1)
20 kW 100% Rated 60A
Eaton 93PM-50-1
Eaton 93PM-50-2 (N+1)
30 kW 100% Rated 90A
Eaton 93PM-50-1
Eaton 93PM-50-2 (N+1)
40 kW 100% Rated 125A
Eaton 93PM-50-1
Eaton 93PM-50-2 (N+1)
50 kW 100% Rated 150A
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