My Cart:

0 item(s)
You have no items in your shopping cart.


Welcome to our online store!

Ansaldo STS / Union Switch & Signal Inc. PD-1 DC Biased Vital Relay

SKU: AR_PD-1 Relay

Availability: 2 item(s)

Estimate Shipping Cost

Enter your destination to get a shipping estimate


Up for sale is a used Ansaldo STS / Union Switch & Signal Inc. PD-1 DC Biased  Vital 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:


A biased relay is equipped with a permanent magnet and arranged so that the  relay armature picks up only when de current is flowing in the coil in a  prescribed direction.


The AAR defines a biased relay as: "A relay that will operate to its  energized position by current of one polarity only, and will return to its  deenergized position when current is removed".