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Ansaldo STS / Union Switch & Signal Inc. PC-250TR Code Generating Relay

SKU: AR_PC-250TR Relay

Availability: 9 item(s)

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Up for sale is a used Ansaldo STS / Union Switch & Signal Inc. PC-250TR Code Generating Relay.


It was pulled from working condition. It shows signs of use.


We have a large number of these in stock, please contact us if you are buying in bulk.



Original Manufacturer Description:


The PC-250TR is a high quality code generating relay. It is used to generate  code frequencies for coded track circuits and cab signaling equipment. This  relay is tuned to a specific frequency. Its contacts are then used to open and  close a circuit at the set rate providing equal off and on times.


Two types of contacts are available in the PC-250TR: L.V. (low voltage) and  H.V. (high voltage). The L.V. is silver platinum-to-silver platinum for use in  circuits below 50 volts, while the H. V. is tungsten-to-tungsten for use in  circuits above 50 volts, to afford longer contact life. The tungsten contacts  cannot be employed in low voltage circuits due to the high contact resistance  they develop. The PC-250TR relay must be horizontally separated by at least five  inches from the code following relays. However, PC-250TR relays may be mounted  adjacent to each other. These relays are not equipped for front testing.


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