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Power
®
Line Transfer Switch (LTS) Installation Instructions
Alpha’s LTS Series of line transfer switches provide line transfer switching for cable TV and broadband networks. In the event of a
utility grid power failure, the LTS automatically switches to a secondary power source. When used in conjunction with Alpha power
supplies, the power supply provides backup power during transfer and no output interruption is experienced. Upon the return of the
primary line power, the LTS transfers back to the primary power source. The LTS may be connected to a second utility source or may
be used to switch between two phases of the same utility, providing backup power when one phase is out. Utilizing the second utility
source reduces inverter operation and maintains battery reserves. Installation of the LTS is simple and can be added to most existing
installations where multiple power grids are present.
Connect the LTS using the diagram on the following page that matches your application.
Nominal Specications Model
LTS 120 LTS 240
Input Voltage 120V 240V
Current Rating 18A 12A
Operating Voltage Range 80-138V 156-253V
Low Voltage Trip Point 75-85Vac 140-160Vac
Part Number 745-945-20 745-945-21
Dimensions (in/mm) 3.1H x 5.0W x 5.6D
78H x 127W x 147D
3.1H x 5.0W x 5.6D
78H x 127W x 147D
Hazardous voltage may be present. Improper installation of this device could result in electric
shock, burns, or explosion. Do not use in an unapproved application.
WARNING!
From Primary
From Auxiliary
To Power Supply
Total Power Solutions
Alpha Technologies reserves the right to make changes to the products and information contained in this document without notice.
Copyright © 2007 Alpha Technologies. All Rights Reserved. Alpha
®
is a registered trademark of Alpha Technologies. member of The Alpha Group™ is a trademark of Alpha Technologies.
745-945-C0-001, Rev. A Z2 (11/2007) To report errors or omissions in this document, send email to T[email protected]
For more information visit www.alpha.com
United States Bellingham, Washington Tel: 360 647 2360 Fax: 360 671 4936
Canada Burnaby, British Columbia Tel: 604 430 1476 Fax: 604 430 8908
member of
The Group
T
M
Line Transfer Switch
Line Transfer Switch
Dual Grid Application
Dual Phase Application
Portable Generator Application
Line Transfer Switch
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