Wayside Products
Ansaldo STS USA
(Formerly known as Union Switch & Signal)
RSE-3H3
Rev. 7-03
USSP Secondary Surge Suppressors
ASTS USA Secondary Surge Suppressors (USSP)
help protect many types of solid-state equipment
by limiting electrical surges to this equipment.
This is accomplished with solid state suppression
and inductance coil circuits and various
configura-tions of primary arresters. Different
USSP units cover track circuit, power line and
battery line applications, and all are very easy to
install.
General Description
The basic USSP unit (not including external primary
arresters) is designed to limit low energy transients
and surges that are of insufficient amplitude to breakover the primary arresters, but can still damage
sensitive electronic equipment. A series inductor in
each leg of a USSP unit is common to all of these
units. The inductors provide isolation impedance
between the primary and secondary suppressors.
Various clamping devices are used in conjunction with
the inductors to limit the different line-to-line voltages.
These include Zener diodes, varistors and unipolar to
bipolar Transzorbs.
Each USSP unit is housed in a high-dielectric plastic
case with mounting tabs at each end. Circuit-protective
components, internal wiring and standard AREMA
terminals are fastened to the unit’s cover; this allows
fast disassembly for inspection purposes. The top of
cover is clearly marked with vital unit operating
specifications and terminal nomenclature. Selected
models of the USSP are equipped with the ASTS USA
USG-A Lightning Arrester (see RSE-3H2), which
provide primary voltage surge protection. USSP unit
N451552-0534 is designed for use in non-electrified
track circuits and track circuits on dc-electrified
territories.
To order, call 1-800-652-7276
e-mail: orders@ansaldo-sts.us
Advantages
•
•
•
Helps protect sensitive electronic equipment from
power surges
Wide range of battery, track and ac line options
Versions available for non-electrified, dc-electrified
track circuits
Specifications and Ordering Information
•
•
•
•
Refer to ordering tabulation on reverse side for
USSP part numbers and specifications.
Please indicate required operating specifications
along with order number.
Refer to RSE-3H2 to order additional USG-A
lightning arresters for USSP units.
Request ASTS USA Service Manual SM-6145 for
USSP replacement parts and additional application
data.
www.ansaldo-sts.com
RSE-3H3, p. 1
Ansaldo STS USA
USSP Secondary Surge Suppressors
(Formerly known as Union Switch & Signal)
RSE-3H3
Rev. 7-03
Specifications and Ordering Information (cont’d)
USSP Units
Order No.
N451552-0501
N451552-0502
N451552-0503
N451552-0504
N451552-0506
N451552-0507
N451552-0508
N451552-0511
N451552-0513
N451552-0514
N451552-0515
N451552-0516
N451552-0519
N451552-0523
N451552-0526
N451552-0527
N451552-0528
N451552-0529
Max.
Max.
Max.
Coil
Circuit
Circuit
Circuit
Induct
Capac.
Capac.
Secondary
Model/Type
Vdc
Vac
Amps
(mH)
mFd
Volts
Suppress.
11/Batt.
18
-3
150
100
25
18.8 Vdc
11/Batt.
18
-7
22
100
25
18.8 Vdc
11/Batt.
18
-15
16
100
25
18.8 Vdc
11/Batt.
18
-25
5
100
25
18.8 Vdc
10/Batt.
18
-7
22
100
25
18.8 Vdc
10/Batt.
18
-15
16
100
25
18.8 Vdc
10/Batt.
18
-25
5
100
25
18.8 Vdc
10/Batt.
18
-15
16
100
25
18.8 Vdc
11/Batt.
32
-3
150
100
55
33.3 Vdc
11/Batt.
32
-7
22
100
25
33.3 Vdc
11/Batt.
32
-15
16
100
55
33.3 Vdc
11/Batt.
32
-25
5
100
55
33.3 Vdc
10/Batt.
32
-3
150
100
25
33.3 Vdc
10/Batt.
32
-15
16
100
55
33.3 Vdc
20/Track
7
17
50
5
100
55
31.6 Vdc
20/Track
7
17
50
5
100
55
31.6 Vdc
30/AC
-120
20
8
100
55
140 Vac
31/AC
-240
20
8
100
55
275 Vac
Note (1): With one L.V. arrester mounted line-to-line and two H.V. arresters line-to-ground.
Note (2): With one L.V. arrester mounted line-to-line.
Note (3): Without mounted arrester.
Note (4): With one AC Line arrester mounted line-to-line.
USSP-10 Schematic
USSP-20 Schematic
USSP-11 Schematic
USSP-30 Schematic
RSE-3H3, p. 2
USSP-31 Schematic
Notes
(1)
(1)
(1)
(1)
(2)
(2)
(2)
(3)
(1)
(1)
(1)
(1)
(2)
(3)
(2)
(3)
(4)
(4)