Circuit Breakers; Figure 53 Circuit Breakers - Emerson Liebert NX 480V User Manual

9.1.1

Circuit Breakers

The UPS can be isolated by means of circuit breakers, mounted inside the cabinet and accessible after
opening the front door.
The location of the UPS power switches is shown in Figure 53.

Figure 53 Circuit breakers

The UPS unit circuit breakers are CB1, CB2, CB3 and CB5.
• CB1—Main Input circuit breaker; connects the utility supply to the UPS main input.
• CB2—Bypass circuit breaker; connects the utility supply to the UPS bypass.
• CB3—Maintenance Bypass breaker; connects the utility supply to the UPS maintenance bypass.
• CB5—Output breaker; connects inverter or bypass to the external output transformer or power
distribution panel.
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Operating Instructions