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Section 1 — General Information
RTS “HS” Type Transfer Switch
1.1 INTRODUCTION
This manual has been prepared especially for the purpose of famil-
iarizing personnel with the design, application, installation, opera-
tion 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 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 EQUIPMENT DESCRIPTION
The automatic transfer switch is used for transferring electrical
load from a UTILITY (NORMAL) power source to an GENERATOR
(STANDBY) power source. Such a transfer of electrical loads
occurs automatically when the UTILITY power source has failed or
is substantially reduced and the GENERATOR 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 GENERATOR sources) and, for that rea-
son, codes require it in all standby electric system installations.
The transfer switch consists of a transfer mechanism, UTILITY
SERVICE DISCONNECT circuit breaker, a relay control, fuses, and
a terminal strip for connection of sensing wires.
This transfer switch is suitable for use as service entrance equip-
ment.
1.2.1 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 Wire Conductor Tightening
Rating Range Torque
100A #14-1/0 AWG 50 in-lbs.
200A #6-250 MCM 275 in-lbs.
This transfer switch is suitable for control of motors, electric dis-
charge 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 sys-
tems only.
This transfer switch is suitable for use on a circuit capable of
22,000 rms (200A) and 10,000 (100A) symmetrical amperes,
240 VAC maximum.
Figure 1.1 — Typical ATS Transfer Mechanism
UTILITY
CLOSING
COIL
GENERATOR
CLOSING
COIL
UTILITY LUGS
GENERATOR
LUGS (E1 & E2)
LOAD LUGS (T1 & T2)
1.2.2 UTILITY SERVICE DISCONNECT CIRCUIT
BREAKER
The utility service and generator disconnect circuit breakers for the
100 amp models are:
Siemens, Type BQ, 2-pole•
120/240VAC, 100A•
50/60 Hertz•
Heating, Air Conditioning and Refrigeration (HACR) rated•
Wire range: #1 - #8 AWG.•
The conductor tightening torque is 50 in-lbs.•
The utility service circuit breaker for the 200 amp models are:
Generac, Type 225AF, 2-pole•
120/240VAC, 200A•
50/60 Hertz•
Wire range: 300 MCM - 6 STR (Line), 250 MCM - 6 STR •
(Load - ATS)
The conductor tightening torque is 375 in-lbs. (Line), 275 in-•
lbs. (Load - ATS)
1.3 TRANSFER SWITCH DATA
DECAL
A DATA DECAL is permanently affixed to the transfer switch enclo-
sure. 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.
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