APC Automatic Disconnect Switch User Manual download pdf (Page 11)

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Safety Precautions

Ensure that you read and understand all of the safety information contained in “About This Manual”, in the

front of this manual. If you have any questions concerning any of the safety information, or if you are

concerned that your home or office may not be properly wired for this equipment, contact a qualified and

licensed electrician, and APC Technical Support.

Unit Power

The UTS6 and UTS6BI are rated for 20 A (continuous), and the UTS10BI is rated for 30 A (continuous)

while on

BACKUP1 (generator). However, they are designed to support component inrush currents that

are much higher than their continuous power ratings. The UTS6BI and UTS10BI models are designed to

operate with a 120V/240V load. The UTS6 is only intended for 120V circuits and loads. Also note that

BACKUP2 (UPS) is 15 A or less.

Supporting 240V Circuits

An example of a 240V application would be a well pump. Most well pumps with 1/4 horse power (HP)

motors or greater require 240V, 2-pole (also called “split phase”) power. Models UTS6BI and UTS10BI

are designed to operate with both 120V and 240V loads. However, you must follow these 240V rules:

• Only one 240V circuit can be backed up through the UTS. However, multiple 240V loads can be wired

to that 240 V circuit if required. Consult with a licensed electrician and APC Technical Support for

additional information.

• A 240V circuit will use two UTS circuits. These are Circuits 9 and 10 for the UTS10BI, and Circuits 5

and 6 for the UTS6BI.

• The 240V circuits are only powered from the

Backup1 (generator) source.

Supporting 120V Circuits

Most of the circuits and loads in your home or office will be 120V, single pole. Other than the 240V circuit,

all other UPS circuits are 120V circuits. The number of 120V circuits supported by each of the UTS

models are summarized below.

The following rules must be observed for 120V circuits and loads:

• The 120V circuits should be balanced between Phase 1 and Phase 2 of the incoming generator power for

safe operation, and to ensure optimal backup generator operation.

• If you use a second backup source (for example, a UPS) please note that Circuit1, which also powers the

convenience outlet for the UPS, only works with generator (

GEN) as the backup power source. All other

120V circuits can be backed up by the UPS source.

Note There is also a “hard wiring” option (Part No. UTSHW) to support up to 50 A

generators.

Model

Number of

120V Circuits

Circuits Used for

240V

UTS6BI Four (1 - 4) 5 and 6

UTS6 Six (1 - 6) N/A

UTS10BI Eight (1 - 8) 9 and 10

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 35 36

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APC Automatic Disconnect Switch User Manual Page 11

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