AUTOMATIC TRANSFER SWITCH
CTS SERIES
AUTOMATIC
TRANSFER SWITCH
The Cat® CTS Series Automatic Transfer Switch
(ATS) is configurable for applications requiring the
dependability and ease of operation found in
a full featured power contactor type transfer switch.
The CTS Series is equipped with the MX250
controller that is designed for the most demanding
transfer or bypass switch applications.
FEATURES
DESIGN AND CONSTRUCTION FEATURES
● Double throw, interlocked operation
● Electrically operated, mechanically held
by a simple, over-center mechanism
● Silver alloy contacts with separate arcing
contacts on 600 amp and above
● Arc quenching grids, enclosed arc chambers,
and wide contact air gap for superior source to-
source isolation on all units
● Control circuit disconnect plug and drive inhibit
switch for safe maintenance
● Components accessible for inspection and
maintenance without removal of the switch
or the power conductors
ELECTRICAL RATINGS
● Ratings 40 to 4000 amperes
● 2, 3 or 4 Poles
● NEMA 1, 3R, 4, 4X and 12
● Available to 600 VAC, 50 or 60 Hz
● Suitable for emergency and standby
applications on all classes of load,
100% tungsten rated through 400 amps
● UL 1008 listed at 480 VAC
● CSA C22.2 No. 178 certified at 600 VAC
● IEC 947-6-1 listed through 480 VAC
PERFORMANCE FEATURES
● Contact transfer speed less than 100
milliseconds
● High close-in and withstand capability
● Temperature rise test per UL 1008 conducted
after overload and endurance tests in
unventilated enclosure – exceeds UL
requirements
● Mechanical indicator and contact chamber
cover designed for inspection, safety and
position designation
● Equipped with the MX250 Control Package
LEHE4651-04
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AUTOMATIC TRANSFER SWITCH
NEUTRAL SWITCHING
The CTS Series is available in true four pole designs
for multi-source power systems that require switching
the neutral. The neutral contact is on the same shaft
as the associated main contacts. This design ensures
positive operation, and prevents any possibility that
the neutral contact will fail to open or close, as is
possible when the neutral pole is an add-on
accessory. The neutral contacts are identical to the
main contacts, having the same current carrying and
high withstand /closing ratings as the mains. They are
designed to break last and make first to negate the
possibility of transients while switching the neutral.
SAFE MANUAL OPERATION
The CTS manual operator consists of a large,
easy-to-use handle that fits securely for manual
operation during installation and maintenance
or in an emergency.
Every CTS is provided with an operator inhibit
switch to disconnect the electrical drive prior to
maintenance. Fully enclosed wrap-around arc
covers shield the main contacts and mechanical
components, preventing operator exposure during
manual operation
CTS SERIES ATS
400 amp, 2 pole
TRANSFERRING LARGE MOTOR
OR HIGHLY INDUCTIVE LOADS
3. Series CTSD: The CTSD offers a delayed
transition on transfer switches 40A and above.
This programmed center-off position allows for
the full decay of rotating motors or transformer
fields. It can also be used for load shedding
of selected circuits or other applications which
require a means to disconnect the load from
either source. Many UPS system manufacturers
recommend delayed transition switches to
support sequencing of their systems. Reference
the CTSD supplement for further details.
Some loads, especially large motors receive
severe mechanical stress if power is transferred
out of phase while the motor is still rotating.
Also, back EMF generated by a motor can result
in over currents that can blow fuses or trip circuit
breakers. The CTS Series offers four solutions
to these problems:
1. Optional Universal Motor Disconnect Contact:
This load control disconnects a large motor via
its control circuit for an adjustable period of time
prior to transfer in either direction. For switching
multiple motors, the motor disconnect contact
with staged restart disconnects the motors
prior to transfer and brings them back on line
sequentially.
4. Series CTSCT: Cat closed transition
switches combine CTSD operation during a
source failure with a highly engineered control
system that allows momentary paralleling (100
ms) of two acceptable sources, thereby limiting
the impact of transfer on the load. Reference
the CTSCT supplement for further details.
2. Accessory R50 Phase Monitor: This feature
compares the phase angle between both sources
of power and prevents transfer until the two are
approximately in phase (within a self adjusting
range). The CTS’s high speed transfer action
coupled with the MX series microprocessor
control logic ensure closures at or near zero
degree phase difference
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AUTOMATIC TRANSFER SWITCH
STANDARD FEATURES (MSTD PACKAGE)
Sensing (MSEN) Package, includes:
● EXES Functions
● Normal Source Over voltage sensing (3 phase)
● Q7 – Inhibit Transfer to Normal
● S12P – Auto/Manual Selector Switch
Feature
6/P
J2E/J2N
A3
L1/L2
A4
L3/L4
Calibrate
LN/P
CDT
P1
DS
R50
DT
Function
Momentary Test Switch
Adj. over/under freq (S1 and S2)
Aux Contact (S2 position)
Source Position LEDs
Aux Contact (S1 position)
Source Available LEDs
Volt. and Freq. calibration
Center-Off Position LCD*
Load/No-Load Exerciser
Source 2 Start Time Delay
Auto/Inhibit Switch (> 600A)
In-Phase Monitor
Time Delay – Neutral to S1*
Transfer Commit
Time Delay – Neutral to S2*
Source 1 Stable Time Delay
Engine Start Contact
Special (MSPE) Package, includes:
● CONS Functions
● SENS Functions
● S5P – Manual transfer to Normal Switch
(Replaces S12P)
Switchgear (MPSG) Package, includes:
● SPES Functions
● Additional set of A3/A4 Contacts
● R15 – Load Shed to “Dead Normal” or
● R15D – Load Shed to Neutral Position*
● S12/P – Auto-Manual Selector Switch
S13/P
DW
T
E
U
EL/P
Source 2 Stop Time Delay
Log of last 16 events and
System Data
VI
Voltage Imbalance
K/P
W
YEN
S1 and S2 Freq. Indication
S2 Stable Time Delay
Bypass T and W Time Delays
*Available with Delayed Transition switches only.
OPTIONAL PACKAGES
Exerciser (MEXE) Package, includes:
● STDS Functions
● A1/A1E – S1/S2 Failure aux contact
● A3/A4 – One additional contact each
● CDP – Programmable exerciser
● Q2 – Remote Peak Shave/Load Test
● R16 – Phase Rotation Sensing
Screenshot of ATS operating parameters on Cat
Switchgear HMI.
Combined with the optional Modbus
Communication Card, the PSGS package allows
for integration with Cat Switchgear. This feature
allows ATS operating parameters to be displayed
on the PowerLynx® 3000 HMI as well as on the
optional Remote Monitoring Software. Supply of
this feature set affords real-time monitoring of the
ATS as well as direct control over the following
parameters from the Switchgear HMI:
● Timer Settings
Controls (MCON) Package, includes:
● EXES Functions
● Q3 – Remote Inhibit transfer to Emergency
● Q7 – Inhibit Transfer to Normal
● T3/W3 – Elevator Pre-Signal Aux Contacts
● UMD – Universal Motor Load Disconnect
● Pickup/Dropout settings
● Testing Functions
● Alarm functions
● Manual operation
LEHE4651-04
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AUTOMATIC TRANSFER SWITCH
CT
CTS SERIES ACCESSORY DEFINITIONS
6P
CTS SERIES ACCESSORY GROUP MATRIX
Microprocessor activated test switch (Momentary)
6A
Hardwired test switch (Maintained)
6AP
Microprocessor activated test switch (Maintained)
6BK
Hardwired test switch (Maintained Auto – Momentary Test)
Key operated
6CK
Hardwired test switch (Maintained Auto – Maintained Test)
Key operated
A1
Auxiliary Contact S.P.D.T. – Normal (Source 1) Failure
A1E
Auxiliary Contact S.P.D.T. – Emergency (Source 2) Failure
A3
Auxiliary Contact – closed in emergency (Source 2) Additional
available (10 max.) on CTS Series and need to be specified
A4
Auxiliary Contact – closed in normal (Source 1) Additional
available (10 max.) on CTS Series and need to be specified
A62
Motor disconnect and staged restart (1 contact)
AB3
Auxiliary contact – closed in bypass emergency (Source 2)
(S.P.D.T.) (Standard up to 400A) Additional available (10 max.)
on CBTS Series and need to be specified
AB4
Auxiliary contact – closed in bypass emergency (Source 1)
(S.P.D.T.) (Standard up to 400A) Additional available (10 max.)
on CBTS Series and need to be specified
CALIBRATE
Microprocessor activated calibration feature
CDP
Programmable exerciser daily, 7/14/28/365 days
user-selectable, with or without load
CDT
CTS SERIES ACCESSORY DEFINITIONS
(continued)
Exerciser no load timer
CTAP
Chicago transfer alarm panel mounted in door of enclosure.
Includes 3 aux. contacts and fuse.
DS
Disconnect Switch. Disconnects source voltage to transfer
power panel.
DT (DELAYED TRANSITION ONLY)
Time Delay from Neutral Switch position to Source 2
on retransfer
DW (DELAYED TRANSITION ONLY)
Time Delay from Neutral Switch position to Source 2
on retransfer
HT(1)(2)
Heater and Thermostat 208/240V (1) 380/600V (2)
mounted and
inter-wired in enclosure. (requires larger enclosure for
40-200A)
K
Frequency Meter (Analog) – Door mounted
K/P
Frequency Indication on the controller
LNP
Center-off position LCD-Indicator
L1
LED light indicates Switch in Source 2 position
L2
LED light indicates Switch in Source 1 position
L3
LED light indicates Source 1 available
L4
LED light indicates Source 2 available
E
Engine Start Relay
EL/P
Event log of last 16 events
ETHERNET
Ethernet Communication Adapter. Requires Modbus
Communication Module.
F
Fan contact, closed when engine runs.
LEHE4651-04
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AUTOMATIC TRANSFER SWITCH
CTS SERIES ACCESSORY DEFINITIONS (continued)
R16
LonWorks
Phase rotation sensing of Normal (Source 1) and
Emergency (Source 2)
LonWorks Communication Module
M1
R26/R26D
Single Phase Amp Meter (Analog)
Interruptible Power Rate Provisions. Allow transfer out
of Source 1 position to Mid position or dead Source 2.
Alarm and Pre-Signal circuit included. (Need to specify
voltage – 120 VAC, 24 VAC, 24 VDC
R50
M2
Three Phase Amp Meter (Analog)
M90
EPM2000 True RMS Digital Meter with display (Amps, Volts,
Power, Energy, Power Factor and Frequency). 3 Line LED
In Phase monitor between Normal (Source 1) and
Emergency (Source 2) to allow transfer
S5P
Display. 50/60 Hz Universal Operation. 1 or 3 phase. Standard
Modbus RTU RS485 communications capability.
M90A
Microprocessor activated auto/manual retransfer
selector switch for transferring to Normal (Source 1)
(includes microprocessor activated YN accessory)
S12P
Includes Modbus communication card and factory wiring
between EPM2000 and Modbus communication card.
M90B
Includes Modbus communication card, Ethernet communication
Microprocessor activated auto/manual retransfer
selector switch for transferring to Normal (Source 1)
(includes microprocessor activated YN & YE accessory)
S13P
adapter and factory wiring between EPM2000 and Modbus
communication card.
M91
EPM6000 True RMS Digital Meter with display (Amps, Volts,
Microprocessor activated commit/no commit on
transferring to Emergency (Source 2) (with
enable/disable settings)
Power, Energy, Power Factor and Frequency, THD). Certified
energy and demand metering. Meets ANSI C12.20 and IEC
687 Accuracy Classes. Front IrDA Port Laptop Connection.
S14K
Standard Modbus RTU RS485 or DNP 3.0 communications
Keyed selector switch for retransfer to normal-test-auto
SW1
capability.
M91A
Auto/Off/Start Engine control selector – Door mounted
(keyed or non-keyed operation available)
SW2
Includes Modbus communication card and factory wiring
between EPM6000 and Modbus communication card.
M91B
Auto/Off Engine control selector – Door mounted
(keyed or non-keyed operation available)
SW3
Includes Modbus communication card, Ethernet communication
adapter and factory wiring between EPM6000 and Modbus
communication card.
Source Priority Selector Switch – Door mounted. Allows
selection of Source 1 or Source 2 to be the Prime
Source. Transfer Switch will transfer to selected Prime
Source if that Source is available. (keyed or non-keyed
operation available)
Modbus
Modbus RTU Communication Module
N1
Running Time Indicator – Door mounted
N2
T
Operation Counter – Door Mounted
Retransfer to Normal (Source 1) adjustable time delay
T3/W3
P1
Engine Start Timer (adjustable to 6 seconds)
Pre-signal contact on transfer to Normal (Source 1) or
Emergency (Source 2) during test
U
P2
Engine Start Timer – Extended time delay (adjustable to
300 seconds)
Engine stop /cool adjustable cool down timer
UMD
Pre and post transfer output adjustable time range.
Functions in both directions. Includes 2 circuits.
(Additional circuits available).
Q2
Peak shave/remote load test/area protection – Relay (S.P.D.T.)
(Need to specify voltage – 120 VAC, 24 VAC, 24 VDC – 120V
default standard)
Q3
VI
Inhibit transfer to emergency (Source 2) (load add relay) – Relay
(S.P.D.T.) (Need to specify voltage – 120 VAC, 24 VAC,
24 VDC – 120V default standard)
Voltage imbalance between phases (3 Phase only)
W
Adjustable time delay on transfer to Emergency
(Source 2)
YEN
Bypass transfer timers function (soft key switch in
microprocessor)
Q7
Inhibit transfer to normal (Source 1) – Relay (S.P.D.T.) (Need to
specify voltage – 120 VAC, 24 VAC, 24 VDC – 120V default
standard)
R1-1/R1-3
Over Voltage sensing for normal (Source 1) single (R1-1)
or three (R1-3) phase
R15/R15D
Load Shed. Should Source 2 become overloaded, a signal can
be given to switch to the Neutral position.
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AUTOMATIC TRANSFER SWITCH
CTS SERIES DIMENSIONAL SPECIFICATIONS
CTS Series Transfer Switches
NEMA 1 Enclosed
Ampere
Rating
Height
(A)
Width
(B)
Depth
(C)
Reference
Figure
Application
Notes
Poles
Weight
40,80, 100 & 150
225, 260 & 400
600
2,3
4
24 (610)
24 (610)
18 (457)
18 (457)
24 (610)
24 (610)
40 (1016)
40 (1016)
40 (1016)
40 (1016)
36 (914)
36 (914)
36 (914)
36 (914)
47 (1194)
47 (1194)
11 (279)
11 (279)
14 (356)
14 (356)
20 (508)
20 (508)
20 (508)
20 (508)
48 (1219)
48 (1219)
48 (1219)
48 (1219)
62 (1575)
62 (1575)
A
A
A
A
B
B
B
B
C
C
C
C
C
C
57 (26)
60 (27)
1-7
1-7
1-8
1-8
1-8
1-8
1-11
2,3
4
46 (1168)
46 (1168)
74 (1880)
74 (1880)
74 (1880)
74 (1880)
90 (2286)
90 (2286)
90 (2286)
90 (2286)
90 (2286)
90 (2286)
165 (75)
170 (68)
2,3
4
380 (172)
430 (195)
455 (206)
540 (245)
1010 (458)
1160 (526)
1130 (513)
1395 (633)
1595 (723)
1850 (839)
800, 1000 & 1200
1600 & 2000
3000
2,3
4
3
4
3
4
4000
3
4
Application Notes :
1. Dimensions are listed in inches (mm) and weights in pounds (kg).
2. Includes 1.25" door projection beyond base depth. Allow a minimum of 3" additional depth for projection of handle, light,
switches, pushbuttons, etc.
3. All dimensions and weights are approximate and subject to change without notice and are not for construction use.
4. Special enclosures (NEMA 3R, 4, 12, etc.) may include mounting tabs, etc. Consult the published dimension drawings for details.
5. Normal and emergency may be ordered inverted on any switch. The load may be inverted 500-1200 amps.
Consult the factory for details.
6. Special lug arrangements may require different enclosure dimensions. For certified drawings, contact Caterpillar.
7. Packing materials must be added to weights shown. Allow 15% additional weight for cartons, skids, crates, etc.
8. Add 4" in height for removable lifting lugs.
9. 4000 amp depth dimension shown is standard. Depending on your cable/conduit requirements you may desire a deeper
enclosure. Consult Caterpillar for further details.
10. Lug adapters for 3000-4000 amp limits may be staggered length for ease of entrance. Consult Caterpillar for details.
11. Ventilation louvers on side/rear of enclosure at 3000 and 4000A. One side or rear must be clear to afford proper airflow.
LEHE4651-04
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AUTOMATIC TRANSFER SWITCH
AL-CU UL LISTED SOLDERLESS SCREW-TYPE TERMINALS
FOR EXTERNAL POWER CONNECTIONS
Normal, Emergency
& Load Terminals
Normal, Emergency
& Load Terminals
Switch Size
Amps
Cables
Range of
Switch Size
Amps
Cables
Range of
per Pole
Wire Sizes
per Pole
Wire Sizes
40-80
100-225
260
#8 to 3/0 AWG
800/1000/1200
1600
#2 AWG to 600 MCM
600 MCM
4
#6 AWG to 250 MCM
#6 AWG to 350 MCM
#4 AWG to 600 MCM
#2 AWG to 600 MCM
1
2
2000
8
400
3000
600
4000
NOTES:
*
Line and load terminals are located in rear and arranged for bus bar connection.
1. Special terminal lugs and neutral bars are available at additional cost.
Contact factory and advise cable sizes and number of conductors per pole.
2. Fully rated solid neutral (3x standard normal power connector) provided when required by system voltage.
3. Normal and emergency may be ordered inverted on any switch. Load may be inverted 600-1200 amps.
Consult the factory for details.
4. Lug adapters for 3000-4000 amp units may be staggered length for ease of entrance. Consult the factory for details.
5. Special lug arrangements may require different enclosure dimensions. For certified drawings, contact Caterpillar
Information contained in this publication may be considered confidential. Discretion is recommended when distributing.
Materials and specifications are subject to change without notice.
CAT, CATERPILLAR, their respective logos, “Caterpillar Yellow,” the “Power Edge” trade dress as well as corporate
and product identity used herein, are trademarks of Caterpillar and may not be used without permission.
©2012 Caterpillar
All Rights Reserved.
Printed in U.S.A.
LEHE4651-04 (11/12)
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