Vital Relays and Timers
Ansaldo STS USA
(Formerly known as Union Switch & Signal)
RSE-4C8
Rev. 4-07
PC-250P SS Plug-In Solid-State Code Follower Relay –
Polar Stick
The PC-250P SS (solid-state code follower) relay
performs the identical functions of ASTS USA’s
existing PC-250P relay, and provides the same
high level of reliability, but in a more easily
serviced unit. This all-electronic option for the
earlier relay incorporates rugged solid-state
circuits that duplicate the PC-250P’s operation,
and includes LEDs that assist with operational
and diagnostic monitoring. Because of its solidstate design, the PC-250P SS requires no periodic
field adjustment or calibration. The new relay
meets all applicable AREMA (AAR) standards.
General Description
The PC-250P SS is housed in a standard PN-250
(double-width) relay enclosure with clear Lexan®
cover, and locked in its relay base with a standard
latching mechanism. It is designed to fit in the same
rack space (mounting base) as the original PC-250P.
All relay base contact positions are identical, and the
same indexing configuration has been retained, thus
the new relay can be installed on an existing PC-250P
base with no rearrangement of contact wiring. Two
horizontal PCBs within the contact contain all codefollowing electronics. The upper board contains two
LEDs to indicate relay state (yellow: normal, green:
reverse).
Application
The PC-250P SS is applied as a “polar stick” codefollowing relay by transmitting “corrected code”. It is
operated from a PC-250TR code-generating relay and
is controlled through its own electronic “contact”. This
corrected code does not change, therefore contact
wear on the code generator is compensated or
“corrected”. Unlike the original PC-250P, the new
relay does not require space between itself and
adjacent PC-250 SS relays to avoid magnetic
interference effects. However, where original PC250P relays are still present, PN-250-width spacing
must still be maintained around the PC-250Ps.
To order, call 1-800-652-7276
e-mail: orders@ansaldo-sts.us
Special Application Note: In an ASTS USA PhaseSelective track circuit application where an existing
electro-mechanical PC-250P is to be replaced with
the PC-250PSS, the track relay repeater (TPR)
cannot be used. An ASTS USA Relay Interface Panel
must be installed. For additional information, request
ASTS USA Service Manual SM-9029 or contact your
ASTS USA Account Executive.
Advantages
•
•
•
•
•
•
No periodic inspection needed.
Eliminates the need for field adjustment and
calibration.
Solid-state option for electro-mechanical
counterparts.
Direct plug-in connection to existing racks.
No rewiring of existing circuits required.
No requirement for extra rack spacing (no
magnetic effects)
Specifications
Operating Voltage: 8 to 16 Vdc
Ripple: Limited to instantaneous
voltage drop to not less than 8V
Rec’d Power:
Nominal 12V battery/battery
charger
www.ansaldo-sts.com
RSE-4C8, p. 1
Ansaldo STS USA
PC-250P SS Plug-In Solid-State Code
Follower Relay – Polar Stick
(Formerly known as Union Switch & Signal)
RSE-4C8
Rev. 4-07
Specifications (cont’d)
Ordering Information
AC/DC Switch:
•
Low voltage applications
Load: 2.5A per contact (up to 30
Vdc, 22Vrms)
Protection: Up to 34V, shortcircuit
AC Switch:
•
Refer to ordering tabulation for PC-250P SS part
numbers.
Request ASTS USA Service Manual SM-9029 for
additional information.
High voltage applications
Load: 0.06A (min.) to 2.5A
(max.), 12 to 230Vrms
Protection: Up to 230 VRMS,
install external fusing for short
circuits
Isolation:
Steady power source and control
coil input: 1500Vrms
Breakdown volt.:
Across front/back set: Limited by
34V (low V contacts) and
230Vrms (high V contacts) surge
protections
Temp. Range:
-40°C to +70°C (-40°F to +158°F)
PC-250B SS Code Followers - Magnetic Stick
Order No.
N40115912
N40115913
N40115914
Voltage
8-12
8-12
8-12
Ohms
180/180
180/180
20/20
N40115916
N40115918
8-12
8-12
20/20
20/20
N40115919
8-12
20/20
RSE-4C8, p. 2
Contacts
4N-4R L.V.
4N-4R L.V.
2N H.V.
2R L.V. #1, 2
2N 2R L.V. #3, 4
4N-4R L.V.
1N HV 3N L.V.
4R L.V.
1NR HV#1
3N LV #2, #3, #4
Old PC-250B
Replaced
N322559-012
N322559-013
N322559-014
N322559-016
N322559-018
N322559-019