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Section 1 — General Information
“HS” Type Transfer Switch
1.1 INTRODUCTION
This manual has been prepared especially for the 
purpose of familiarizing personnel with the design, 
application, installation, operation and servicing of 
the applicable equipment. Read the manual carefully 
and comply with all instructions. This will help to 
prevent accidents or damage to equipment that might 
otherwise be caused by carelessness, incorrect appli-
cation, or improper procedures.
Every effort has been expended to make sure that the 
contents of this manual are both accurate and cur-
rent. The manufacturer, however, reserves the right 
to change, alter or otherwise improve the product at 
any time without prior notice.
1.2 EQUIPMENT DESCRIPTION
The automatic transfer switch is used for transfer-
ring electrical load from a UTILITY (NORMAL) power 
source to a EMERGENCY ( STANDBY) power source. 
Such a transfer of electrical loads occurs automati-
cally when the UTILITY power source has failed or is 
substantially reduced and the EMERGENCY source 
voltage and frequency have reached an acceptable 
level. The transfer switch prevents electrical feedback 
between two different power sources (such as the 
UTILITY and EMERGENCY sources) and, for that 
reason, codes require it in all standby electric system 
installations.
The transfer switch consists of a transfer mechanism, 
a relay control, and a terminal strip for connection of 
sensing wires.
This switch is suitable for control of motors, electric 
discharge lamps, tungsten filament and electric heat-
ing equipment and the tungsten load does the switch 
rating.
The transfer switch is for use in optional standby 
systems only.
The transfer switch is suitable for use on a circuit 
capable of 10,000 rms symmetrical amperes, 240 
VAC when protected by a circuit breaker without an 
adjustable short time response or by fuses.
1.3  TRANSFER SWITCH DATA DECAL
A DATA DECAL is permanently affixed to the transfer 
switch enclosure. Use this transfer switch only with 
the specific limits shown on the DATA DECAL and 
on other decals and labels that may be affixed to the 
switch. This will prevent damage to equipment and 
property.
When requesting information or ordering parts for this 
equipment, make sure to include all information from 
the DATA DECAL.
Record the Model and Serial numbers in the space 
provided below for future reference.
1.4 TRANSFER 
SWITCH 
ENCLOSURE
The standard switch enclosure is a National Electrical 
Manufacturer’s Association (NEMA) 3R type. NEMA 
3R type enclosures primarily provide a degree of pro-
tection against falling rain and sleet and is not dam-
aged by the formation of ice on the enclosure.
1.5  SAFE USE OF TRANSFER SWITCH
Before installing, operating or servicing this equip-
ment, read the SAFETY RULES (inside front cover) 
carefully. Comply strictly with all SAFETY RULES to 
prevent accidents and/or damage to the equipment. 
The manufacturer recommends that a copy of the 
SAFETY RULES are posted near the transfer switch. 
Also, be sure to read all instructions and information 
found on tags, labels and decals affixed to the equip-
ment.
Two publications that outline the safe use of transfer 
switches are the following:
• NFPA 70; National Electrical Code
• UL 1008, STANDARD FOR SAFETY-AUTOMATIC 
TRANSFER SWITCHES
MODEL #
SERIAL #