Table 3-9. Recommended Dc Input Battery Disconnect Circuit Breaker Ratings (240 Cell) - Eaton 93PM Installation And Operation Manual

No manual DC disconnect device is provided within the UPS.
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.
If required, an external DC input overcurrent protection and disconnect switch is to be supplied by the
customer. Table 3-9 lists the recommended ratings for circuit breakers satisfying the criteria for each battery
voltage. 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 3-9. Recommended DC Input Battery Disconnect Circuit Breaker Ratings (240 Cell)

Eaton 93PM Emergency Lighting UPS (20–40 kW, 480V Four Wire – UL 924) Installation and Operation Manual P-164000569—Rev 2
UPS Model
Eaton 93PM-50-1
Eaton 93PM-50-1
Eaton 93PM-50-1
Output Rating
UPS Rating 480V
20 kW 60A
30 kW 90A
40 kW 125A
UPS Installation Plan and Unpacking
www.eaton.com/powerquality 3-17