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I have a silver box mounted in front of each relay. What are these units? Are they a different type of relay or a power supply for each relay?

These small devices you see are pilot light transformers (original part numbers: PL‐6 and PL‐120). Their sole purpose is to power the pilot lights in the master control stations. When the relay changes to the ON position, the pilot transformer powers the light in the switch to provide a status light for control. If a pilot transformer were to fail, the only effect on the system would be that the corresponding pilot light would not light up. The control of the room lights would not be affected.


Category: Touch‐Plate systems dated 1946‐1985

← I have a silver box mounted in front of each relay. What are these units? Are they a different type of relay or a power supply for each relay?

Contact Info

Touch-Plate Lighting Controls

1830 Wayne Trace
Fort Wayne, IN 46803

Phone: 260.426.1565
Fax: 260.426.1442