APC MXA002 Datasheet download pdf (Page 11)

3.0 Presentation

3.1 Isolation Unit (IU)

Rear view of the Isolation Unit

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Isolation Unit (IU)

The Isolation Unit contains the UPSs isolation transformer, EMI/RFI and surge

suppression, bypass circuits including an auxiliary power supply, and mains and load

wiring interfaces. The IU is capable of autonomous operation and allows service of

the Electronics Unit without interruption of power to the load.

Input circuit breaker (power ON / OFF)

The input circuit breaker controls power to the UPS. It protects the UPS and the

service wiring from extreme overloads.

Cooling fan

The fan exhausts air from the IU and operates whenever the input circuit breaker is

ON (I). If the fan fails, the UPS will indicate an alarm condition. Under such condi-

tions, the UPS will remain operating and is capable of delivering full power to the

load.

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APC MXA002 Datasheet Page 11