MGE UPS Systems EPS 8000 User Manual

EPS 8000 UPS circuit breakers (except the battery disconnect circuit breaker QF1) are located behind the doors of

the Input/Output cabinet.  Following is a brief description of the available circuit breakers and contacts, and their

function (Figures 1-2, 1-3, and 1-4).  

Input isolation circuit breaker, used to isolate the UPS from the main AC input (mains 1) and provide

input current protection.

Battery disconnect circuit breaker, external to the UPS, used to disconnect the battery from the UPS.

QF1 provides isolation and protection between the UPS and its battery system. 

(optional)  Maintenance bypass circuit breaker, used to supply the attached load via the bypass source

while the UPS is being serviced.

Optional UPS isolation circuit breaker, used to isolate the UPS module from the attached load.

Bypass input circuit breaker; it is used to isolate the UPS from the bypass input (mains 2) source and

provide back-feed protection. This circuit breaker is mounted inside the Input/Output cabinet for 625

and 555 kVA units.

I N P U T  
C B,   Q 1