Product Manual

2
1.1 INTRODUCTION
This manual has been prepared especially for the purpose of familiar-
izing 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 careless-
ness, incorrect application or improper procedures.
Every effort has been expended to make sure that the contents of this
manual are both accurate and current. The manufacturer, however,
reserves the right to change, alter or otherwise improve the product
at any time without prior notice.
1.2 UNPACKING
Carefully unpack the transfer switch. Inspect closely for any damage
that might have occurred during shipment. The purchaser must file with
the carrier any claims for loss or damage incurred while in transit.
Check that all packing material is completely removed from the switch
prior to installation.
1.3 EQUIPMENT DESCRIPTION
The automatic transfer switch is used for transferring electrical
load from a UTILITY (NORMAL) power source to a GENERATOR
(STANDBY) power source. Such a transfer of electrical loads occurs
automatically when the UTILITY power source has failed or is sub-
stantially reduced and the GENERATOR source voltage and frequen-
cy have reached an acceptable level. The transfer switch prevents
electrical feedback between two different power sources (such as
the UTILITY and GENERATOR sources) and, for that reason, codes
require it in all standby electric system installations.
The transfer switch consists of a transfer mechanism, UTILITY SER-
VICE DISCONNECT circuit breaker, a relay control, fuses, terminal
strip, and fuse holder for connection of sensing wires.
This transfer switch is suitable for use as service equipment.
1.3.1 TRANSFER SWITCH MECHANISM
These switches (Figure 1.1) are used with a single-phase system,
when the single-phase NEUTRAL line is to be connected to a Neutral
Lug and is not to be switched.
Solderless, screw-type terminal lugs are standard.
Switch Rating Wire Range
300/400A (1) #4-600 MCM or
(2) 1/0-250 MCM
This transfer switch is suitable for control of motors, electric discharge
lamps, tungsten filament and electric heating equipment where the
sum of motor full load ampere ratings and the ampere ratings of other
loads do not exceed the ampere rating of the switch and the tungsten
load does not exceed 30 percent of the switch rating.
This UL listed transfer switch is for use in optional standby systems
only (NEC article 702).
This transfer switch is suitable for use on a circuit capable of 18,000
rms symmetrical amperes, 240 VAC maximum.
Figure 1.1 — Typical ATS Transfer Mechanism
1.3.2 UTILITY SERVICE CIRCUIT BREAKER
The utility service circuit breaker for the 300/400 amp models are:
• Generac, 300/400AF
• 120/240VAC, 300/400A
• 50/60 Hertz
• Wire range: (1) #4-600 MCM or (2) 1/0-250 MCM
• The conductor tightening torque is 375 in-lbs.
General Information