Automatic Transfer Switches

Global
The Power of One
Used for switching power between the primary (utility)
Together as a system,
and secondary (backup or supplemental) power
sources, Cummins automatic transfer switches PowerCommand transfer switches,
feature PowerCommand control technology for easy digital paralleling systems, generator
operation, and a robust, high-contact-force design to
withstand thousands of switching cycles. A full line of
sets and digital master controls
standard switches is available from 40 to 4,000 amps provide you with peace of mind
for the entire range of power systems with common unmatched by others in the industry.
bus communication language. Key features include:

> Open, closed or programmed transition transfers > Custom-engineered switches are available to fit
> Bypass isolation configurations unique project requirements
> Withstand and closing ratings up to 200 kA > Installed in more than 100,000 applications globally
> Service entrance configurations to 1,000 amps > Convenient front-panel display to easily review power
> Global agency approvals, including: UL1008, IEC, and load conditions, make adjustments, review
CSA, NFPA, IEEE, IBC and NEMA ICS 10 events and check network status

PowerCommand system integration

Network / SCADA wires
Control wires

Cummins Power Generation offers a wide range of At Cummins Power Generation, we engineer our transfer
automatic transfer switches for seamless transfer of switches with flexibility and ease-of-operation in mind.
power between the power sources in your application. Paired with a PowerCommand generator set, the result
Included as part of a completely integrated power is a robust power system capable of ensuring reliable
system, PowerCommand transfer switches rely on performance while maximizing cost effectiveness.
proven technology to deliver fail-safe performance in
critical applications.

2 power.cummins.com
Reliable, flexible, easy to use
PowerCommand transfer switches
provide safe, dependable power
transfer between sources.

LOAD LOAD

Generator-to-generator Utility-to-generator
For facilities with a prime power system using multiple For facilities with a standby power system and a
on-site generators. If the primary generator fails, the single utility feed. The transfer switch senses when
transfer switch sends a start signal to the second utility power has been lost, sends a start signal to the
generator and then transfers the load. standby generator and transfers the load.

LOAD

LOAD

Utility-to-utility Three-source system

For use in facilities with redundant utility feeds but no For facilities with a standby power system and two
standby generator. If one utility feed fails, the transfer utility feeds. The utility transfer switch controls the
switch automatically connects the load to the second feeds from the two utilities based on a pre-established
utility feed. priority. If both utility feeds fail, the generator transfer
switch sends a start signal to the standby generator
and transfers the load.

Another three source system uses a standby generator

in place of the second utility (dual standby). If the utility
fails, the first transfer switch sends a start signal to the
primary standby generator and transfers the load. If
the primary standby generator fails, the transfer switch
sends a start signal to the second generator set and
transfers the load.

power.cummins.com 3
Dependable power transfer
Open, closed or programmed-transition transfer

OTPC
> Open, closed or programmed transition
> 40-4000 amps
> 3- and 4-pole
> UL-listed
......................................................................................................................................................................... 6

CHPC
> Closed transition
> 125-800 amps
> 2-, 3- and 4-pole
> UL-listed
....................................................................................................................................................................... 10

OHPC
> Open or programmed transition
> 125-800 amps
> 2-, 3- and 4-pole
> UL-listed
....................................................................................................................................................................... 10

OTEC
> Open (in-phase) or programmed transition
> 40-1000 amps
> 3- and 4-pole
> UL-listed

....................................................................................................................................................................... 11

GTEC
> Open or programmed transition
> 40-2000 amps
> 2-, 3- and 4-pole
> IEC and CE-labeled

....................................................................................................................................................................... 12

Bypass isolation load transfer

BTPC
> Open, closed or programmed transition
> 150-4000 amps
> 3- and 4-pole
> UL-listed

......................................................................................................................................................................... 8

4 power.cummins.com
Choice of transfer modes
PowerCommand transfer switches
optimize system reliability and
performance, reduce maintenance
costs and enhance your entire
system with unique capabilities.
Open-transition transfer Closed-transition transfer
Break-before-make switching action: The most basic Make-before-break switching action for uninterrupted
type of transfer; the connection to one source is power transfer. The transfer switch provides a
opened before the connection to the second source is seamless transfer of the load from one source to
closed. The sync-check feature included in the open- another by momentarily paralleling both sources
transition transfer control monitors both sources and (<100 milliseconds) during the transfer period.
initiates the transferavoiding out-of-phase closing.
Applications: Critical power requirements, including
Applications: Emergency, code-required and optional hospitals and data centers
standby systems; resistive loads; small motor loads

Programmed-transition transfer Bypass isolation transfer

Similar to open-transition transfer. The switch opens Allows maintenance to the main ATS without
the connection to one source, pauses for an adjustable disconnecting the load. By having two transfer switches
delay time, then closes the connection to the second connected in parallel, the bypass transfer switch adds
source. The adjustable time between sources allows redundancy to the system.
the decay of residual voltage before connecting to the
second source. Applications: Critical power and maintenance
requirements, including healthcare and data center
Applications: Inductive (motor) loads; recommended
by some manufacturers of UPS and VFD equipment

} }
Utility and Utility and
generator generator
synchronized synchronized
voltage voltage

}
Load
voltage }
Load
voltage

Break-before-make switching action opens Make-before-break switching action provides

the connection to one source before closing the uninterrupted power transfer. The switch closes the
connection to the second source. Shown: open connection to the second source before opening the
transition with sync check. connection to the first source.

power.cummins.com 5
OTPC
automatic transfer switches
OTPC 40-4000 amp series PowerCommand automatic
PowerCommand automatic transfer switches
transfer switches feature
Premium-featured OTPC PowerCommand transfer
switches are ideal for emergency, code-required microprocessor-based control
and optional standby power applications. The OTPC technology for easy operation and
transfer switch is available in several different control
configurations to meet the requirements of your load
robust, high-contact-force design.
transfer application.

1008 ICS10

> PowerCommand control

Microprocessor-based controls are developed
specifically for automatic transfer switch operation

> Robust control system design

Optically-isolated logic inputs and high-isolation transformers
for AC power inputs provide high-voltage surge protection

> Communications capability

Transfer switch communicates via a SCADA network
or LonWorks

> Easy service/access

Plug connections, door-mounted controls, ample access space,
compatible terminal markings simplify access

> Advanced transfer switch mechanism

Bi-directional linear motor actuator provides virtually friction-
free, constant-force, straight-line transfer switch action with no
complex gears or linkages

> Break-before-make action

Independent break-before-make action is used for both 3-pole
and 4-pole/switched neutral switches

> Main contacts

Heavy-duty silver alloy contacts with separate arcing surfaces
and multi-leaf arc chutes are rated for total system transfer
including overload interruption

> Mechanical interlock

Prevents simultaneous closing of normal and emergency contacts

> Service entrance option available

6 power.cummins.com
 Features:
> Long-life, high-visibility > LED bar graph
LED indicators Displays color-coded and
Designed to last the life of the control; easy-to-read load status including
include not in auto and test/exercise 3-phase AC voltage, current,
active monitoring frequency, kW and power factor

> Momentary push buttons > Lamp test button

Allow for quick, one-touch testing
and retransfer of power
> Front panel security lock
Safeguards against unauthorized
> Digital vacuum fluorescent displays adjustments or operation
Feature 2-line-by-20-character for easy
reading at a distance; superior to LCD-type > Override button
displays at extreme operating temperatures
Bypasses time delays

> Sync command > PowerCommand

Works with PowerCommand generator networking capability
set for highly reliable closed-transition Monitors the entire Cummins
and in-phase transfers Power Generation power system

Automatic transfer switch

standard and optional features

> Mechanical lugs or > Easy access

optional compression lugs terminal block > Barriers over all live parts
> Manual
operating handle Offers flexible terminal connections Provides safety shield for operations

> Spring-loaded overcenter

> Stored-energy actuator mechanism
Provides consistent high- Provides automatic, fast and
speed transfers consistent manual operation
and reliable speed of transfer
> Front access (40-1000 amps)
terminals
Allow for ease of > Linear motor operator
installation Provides simple direct motion,
constant force and smooth
> Blow-on contactor program transition without
Provides for high gears or links (40-1000 amps)
survivability in short circuit
conditions > Permanently attached
manual operator handles
> Manual operating Closed-transition Open-transition
handle Allows for manual operation and
transfer switch transfer switch
easy servicing (40-100 amps)
mechanism mechanism

power.cummins.com 7
BTPC
bypass-isolation transfer switches
PowerCommand bypass- BTPC 150-4000 amp series PowerCommand
bypass-isolation transfer switch
isolation transfer switches are
These switches feature non-load break bypass operation
ideal for critical-need applications that maintains service to critical loads when the automatic
where any disruption of transfer switch is drawn out of service.

supply power, even for routine External manual

maintenance, is unacceptable. operation capability for
the automatic transfer
BTPC series transfer switches combine the features of switch provides safe,
our advanced automatic transfer switch with a closed- reliable operation while
door drawout isolation mechanism, a two-source lead source interlocks
bypass switch and exclusive microprocessor-based prevent the operator
controls. The switch allows maintenance, service from connecting loads
and testing of the automatic transfer switch without to a failed utility or
disrupting power to critical loads. The resulting power generator source. The
transfer redundancy helps ensure constant, reliable full mechanical interlock
power for critical applications. system prevents
accidental interconnection
of the power sources.

SOURCE 1 SOURCE 1
(Preferred) (Alternate)
LOAD

Bypass switch
(Dual source)

Electrical
Isolating means
mechanical
interlocks

Transfer switch

8 power.cummins.com
Features:

> Bypass to any viable > PowerCommand control

source at any time
Allows for normal or
emergency power, > Permanently mounted
whichever is required instructions

> Mechanical flags

Indicate bypass position > Drawout positions
Are connected, tested and isolated
with door closed for safety
> Easy manual operation
Allows manual transfer to any
available source at any time
> Heavy-duty 3-point latches
Insures door will stay closed without
the need for screw-in fasteners

Bypass isolation transfer switches

standard and optional features

> Cabinet space for all top or > Touch barrier over
all bottom cable connections field connections

> Automatic safety shutters

> Drawout automatic Drop into place as the bypass is
transfer switch engaged, covering the primary
disconnects as the transfer
switch is withdrawn
> Dead source electrical interlock
Prohibits closing to a dead source > Stationary bypass switch

> Clear Lexan barriers > Lexan shutter

Allow viewing of contact position Covers drawout stabs for
touch protection

> Control disconnect plugs for > Convenient drawout rails

faster and safer service Allow automatic transfer switch
Bypass-isolation to be quickly rolled out and
replaced
switch mechanism

power.cummins.com 9
CHPC/OHPC
automatic transfer switches
CHPC closed-transition 125-800 amp series OHPC open-transition 125-800 amp series
PowerCommand automatic transfer switches PowerCommand automatic transfer switches
Designed specifically for uninterrupted, closed-transition For open-transition operation, OHPC transfer switches
operation, the revolutionary design incorporates also incorporate PowerCommand microprocessor
proven PowerCommand micro-processor control with control and a reliable High-Endurance Mechanism.
an innovative High-Endurance Mechanism (HEM) for The OHPC is ideal for utility-to-utility, utility-to-genset
uncompromising reliability. and genset-to-genset applications.

1008 ICS10
> UL-listed 30-cycle ratings
OHPC is listed for short-time ratings of 25,000 amps at
10 cycles for 125-260 amps, 30,000 amps at 30 cycles for
300-600 amps, and 42,000 amps at 30 cycles for 800 amps.

> PowerCommand microprocessor control

Fully-featured, field-programmable microprocessor control;
easy setup and accuracy

> Surge protection

Optically-isolated logic inputs and high isolation transformers
for AC power inputs provide high-voltage surge protection

> Selectable transfer method (OHPC)

The switch automatically transfers the load back either by
using the fast transfer or delayed-transition mode of operation

> Manual operation

Manual operating handles and stored-energy transfer
mechanism allow effective manual operation

> Easy service/access

Plug connections, door-mounted controls, ample access
space and compatible terminal markings simplify access

> Main contacts

Heavy-duty silver alloy contacts and multi-leaf arc chutes are
rated for total system transfer

> Stored-energy mechanism

Allows the mechanism to be switched between sources even
when no source is available

10 power.cummins.com
OTEC
automatic transfer switches
OTEC 40-1000 amp series Cummins Power Generation
automatic transfer switches
switches are built to withstand
The OTEC series transfer switch provides the basic
features you need for primary source and generator thousands of switching cycles,
set monitoring, generator set starting and load transfer ensuring reliable operation.
functions for emergency standby power applications.

1008 ICS10

> Easy service/access

Plug connections, door-mounted controls, ample access
space, compatible terminal markings simplify access

> Advanced transfer switch mechanism

Bi-directional linear motor actuator provides virtually friction-
free, constant-force, straight-line transfer switch action with
no complex gears or linkages

> Break-before-make action

Independent break-before-make action is used for both 3-pole
and 4-ppole/switched neutral switches

> Main contacts

Heavy-duty silver alloy contacts with separate arcing surfaces
and multi-leaf arc chutes are rated for total system transfer
including overload interruption

> Main contacts

Heavy-duty silver alloy contacts with separate arcing surfaces
and multi-leaf arc chutes are rated for total system transfer
including overload interruption

> Mechanical interlock

Prevents simultaneous closing of normal and emergency contacts

> Positive interlocking

Mechanical and electrical interlocking prevent source-to-source
connection through the power or control wiring

> Manual operation

Manual operating handles, shielded termination and over-center
type contact mechanisms allow effective, manual operation
under de-energized conditions

> Microprocessor control

Fully-featured microprocessor control is standard, with all
features, settings and adjustments software-enabled for ease
of setup and accuracy

> Service entrance option available

power.cummins.com 11
GTEC
automatic transfer switches
GTEC 40-2000 amp series
automatic transfer switch
The GTEC automatic transfer switch combines reliability
and flexibility in a small, economical package for normal
and generator set source monitoring, generator set
starting and load transfer functions. GTEC automatic
transfer switches are ideal for IEC emergency, standby
and optional standby applications.
Not available in North America.
> Microprocessor control
Fully-featured microprocessor control is standard with all
settings and adjustments designed for easy operator use via
the front display panel

> Operating modes

Open transition with programmed transition (adjustable
0-10 seconds); open transition with sync-check monitor and
programmed-transition backup; exercise mode; and test mode

> Manual operation handle (standard)

Allows manual operation of the switch after proper disconnection
of power sources

> Easy service/access

Door-mounted controls, ample access space and compatible
terminal markings allow for easy access

> Positive interlocking

Mechanical interlocking prevents source-to-source connection
through the power contacts

> Solenoid
A powerful and economical solenoid power GTEC transfer
switches

> Advanced transfer switch mechanism

True transfer switch mechanism with break-before-make action

> Continuously rated

Can be used in applications up to their nameplate rating

> Main contacts

Long-life, high-pressure silver alloy contacts withstand
thousands of switching cycles without burning, pitting or
welding and provide 100% continuous current ratings

12 power.cummins.com
Remote Monitoring
PowerCommand remote
monitoring devices let you easily
manage on-site and off-site power
systems from one location.

Whether youre using a desktop computer, a laptop

or a cell phone, PowerCommand remote monitoring
systems help you reduce power setup time, operation
and maintenance. Modbus

PowerCommand accesories for reliable TCP/IP

web-based monitoring

PowerCommand remote monitoring systems let you

monitor generator set and transfer switch functions via
the Internet. You can:
> Monitor remotely via wireless connection using
cellular or satellite communications
> Communicate via an Ethernet connection,
phone line or available wireless configuration
> Connect via an Internet browser on a remote PC
> Send alarms to cell phones, pagers or e-mail
addresses
> Display voltage and frequency of each source
> Monitor one or two generator sets and up to
four transfer switches

Power Suite 5.0 with Transfer Products Selector Tool

Power Suite is Cummins Power Generations web-based application for sizing and applying on-site power systems.
Power Suite is available online at powersuite.cummins.com at no charge; only a brief registration is required.

Power Suite consists of three components: GenSize, the Transfer Products Selector tool, and the Power Suite Library.
After the user enters the project parameters and use Power Suites intuitive tools to build a system, the Transfer
Products Selector tool recommends the Cummins Power Generation transfer switches meeting the project needs.

Transfer switch specification sheets, drawings, wiring diagrams and other technical information are available in the
Power Suite Library.

power.cummins.com 13
Microprocessor controls
Standard Features Optional Features Not Available

Level-2
Level-1 (OTPC/OHPC/
GTEC/OTEC (OTPC/OHPC CHPC/BTPC
control control) control)
Sensing
3-Phase voltage-sensing utility
3-Phase voltage-sensing generator single phase single phase
Electrical isolation from AC mains high impedance transformer transformer
Voltage-sensing accuracy +/-2% +/-1% +/-1%
O/U voltage-sensing utility U/V only
O/U voltage-sensing generator U/V only
O/U frequency-sensing utility
O/U frequency-sensing generator U/F only
Voltage imbalance
Phase rotation
Loss of phase
General features/serviceability
Door-mounted
Controls isolated from switch during service
Single control package for sensing/timing
Voltage surge immunity
Optically isolated customer I/O
Method(s) for sensor/timer adjustments LED configuration front panel, service software front panel, service software
Number of time/date-stamped events 50 50
Real-time clock (RTC)
On-board diagnostics/fault detection
Field-upgradeable software, PC diagnostics
Fully adjustable timers, sensors and control parameters adjustable in steps
Mode control keyswitch interface with control
Supported voltages
120V; 200-240V; 380-480V or ( 220-277V L-N); 600V
Transition modes
Programmed transition
Open transition with sync-check sensor
In-phase monitor
Closed transition (momentary)
Closed transition (soft loading/paralleling)
Display/metering/user interface
Display offered/type VFD VFD
Front-panel LED status lamps 6-fixed (8 for config.) 6 fixed 6 fixed
Front-panel test
Front-panel TD override
Front-panel lamp test/fault reset
Front-panel set exerciser w/display w/display
Color-coded bar graph meters for voltage, current,
frequency, kW & power factor

Engine-exerciser clock
Calendar-based exerciser with real-time clock
Once/week exerciser
Exerciser via external clock module
Number of exercise programs 1 1 8
Power output for external timer
Exercise exceptions 1 8

14 power.cummins.com
PowerCommand controls optimize the reliability
and performance of the power generation system Level-2
Level-1 (OTPC/OHPC/
while keeping costs competitive and providing
GTEC/OTEC (OTPC/OHPC CHPC/BTPC
unique capabilities for the entire system. control control) control)

Time delays
Displays timer delay countdown
Field-adjustable time delays
Time-delay engine start
Time-delay transfer (normal to emerg)
Time-delay retransfer (emerg to norm)
Time-delay engine cooldown
Time-delay elevator pre-transfer
Time-delay programmed transition (delayed neutral)
Time-delay override/bypass feature
Automatic generator-generator changeover timer
Customer inputs/outputs
Remote test with load/transfer to generator
Remote engine start
Transfer inhibit
Re-transfer inhibit
Generator (source-2) common alarm
Utility (source-1) common alarm
Panel security lock
Load shed input
Generator battery charger status input
Remote time delay override/bypass
Remote lamp test/fault reset
Synchronizer enable
Bypass switch position contacts
Generator interface
Generator (1) start contact (relay)
Generator (2) start contact
3-wire generator start compatible (use LT for this feature)
Relay outputs
Source-1 connected
Source-2 connected
Source-1 available
Source-2 available
ATS not in auto
Test/exercise active
Pre-transfer/load disconnect relay drives
Load shed active
Failure to disconnect
Failure to close/open
Failure to sync
Remote communications
Remote communications module
Remote communications description LonWorks, NCM LonWorks, NCM
Remote fault dial-out/paging
Remote dial-in access
Event login 50 50
ATS load sequencing control
Peer-peer system status data
Internet-accessible sites
Current / load monitoring
Agency approvals, code/standards GTEC OTEC OTPC/OHPC OTPC/OHPC/CHPC/BTPC
UL1008
IEC
CSA, NFPA, IEEE
IBC
NEMA ICS 10

power.cummins.com 15
 Asia Pacific
10 Toh Guan Road #07-01
Singapore 608838

Phone 65 6417 2388

Fax 65 6417 2399

Brazil
Rua Jati, 310, Cumbica
Guarulhos, SP 07180-900
Brazil

Phone 55 11 2186 4195

Fax 55 11 2186 4729

China
No. 2 Rongchang East Street
Beijing Economic and Technological
Development Area
Beijing 100176
P.R. China

Phone 86 10 5902 3000

Fax 86 10 5902 3199

Europe, CIS, Middle East and Africa

Manston Park Columbus Ave.
Manston Ramsgate, Kent CT 12 5BF 
United Kingdom

Phone 44 1843 255000

Fax 44 1843 255902

India
35A/1/2, Erandaqana
Our global operations: Pune 411 038
India

144,000 employees in 190 countries Phone 91 020 6602 7525

Fax 91 020 6602 8090
88 manufacturing facilities Latin America
3350 Southwest 148th Ave.
6,500 sales & service centers Suite 205, Miramar, FL 33027
USA
600 distributor locations
Phone 954 431 5511
Fax 954 433 5797

Mexico
Eje 122 No. 200 Zona Industrial
San Luis Potos, S.L.P. 78395
Mexico

Phone 52 444 870 6700

Fax 52 444 824 0082

North America
1400 73rd Ave. NE
Minneapolis, MN 55432
USA

Phone 763 574 5000

USA Toll-free 877 769 7669
Fax 763 574 5298

www.cumminspower.com
2013 Cummins Power Generation Inc.
All rights reserved.
Cummins Power Generation and Cummins
are registered trademarks of Cummins Inc.
For more information contact your Our energy working for you. and Power Suite
local Cummins distributor. are trademarks of Cummins Power Generation.
To find the one nearest you visit Other company, product, or service names
may be trademarks or service marks of others.
power.cummins.com Specifications subject to change without notice.
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