Details
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".
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