UPS Operating Instructions
6-2 Eaton 9E UPS (40–60 kVA, 208/220V) Installation and Operation Manual P-164000058—Rev 4 www.eaton.com/powerquality
Figure 6-2. UPS Breakers
6.1.1 Control Panel
The control panel is used to set up and control the UPS, and to monitor UPS operation. For a description of the
UPS control panel functions, see paragraph 6.2.
6.1.2 Circuit Breakers
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Input Circuit Breaker – The Input circuit breaker is used to control the AC input to the UPS rectifier.
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Bypass Circuit Breaker – The Bypass circuit breaker, as part of the optional maintenance bypass, is used to
control the AC input to the UPS bypass for dual-feed systems.
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Output Circuit Breaker – The Output circuit breaker, as part of the optional maintenance bypass, is used to
control the AC output from the UPS inverter.
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Maintenance Bypass Breaker – The Maintenance Bypass breaker, as part of the optional maintenance
bypass, is used to partially isolate the UPS so that a limited number of components can be serviced without
interrupting power to critical systems.
Maintenance Bypass
Breaker (Optional)
Bypass Breaker
(Optional)
Input Breaker
Output Breaker
(Optional)
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