The 2903 Series was a line of visual appliances replacing the 4050-80 series in the late 1970's due to the plastic 2903's being cheaper to make than the stamped-steel 4050-80's. the 2903 series was replaces by the 4903 series in the early 1990's. Unlike most A/V retrofit plates, most of the 2903 models have the horns mounted in the rear as seen at right. The 2903 Series uses the 2975-9145 Box DATA SHEET [CLICK] MANUAL: [CLICK] (NEW)
The most common combination is the 2903-9101 which is shown at right with a 2901-9833 horn ------> Here are the model numbers: 2903-9001: lamp, 24vdc, rear mt 2903-9002: Lamp, Surface Mt, 24vdc 2903-9003: lamp, 24vdc 2903-9005: Lamp, dual Bulb, 24vdc 2903-9006: Lamp, 2 Bulb, Surface mt, 24vdc, 2903-9050: lamp, 120vac 2903-9101: Strobe Plate, 24vdc, rear mt 2903-9102: surface mount strobe plate 2903-9150: strobe, 120vac Not much is known about the 2904 series' visual only signals, but there were some: 2904-9001: V/O Bulb, 24vdc, white 2904-9101: V/O, Strobe, 24vdc, white, red lettering 2904-9103: V/O, Strobe, 24vdc, Red, white lettering 2904-9107: V/O, Strobe, 24vdc 2904-9108: V/O, Strobe, 24vdc 2904-9109: V/O, Strobe, 24vdc 2904-9110: V/O, Strobe, Exit lettering, red On the back of the light/strobe plates, the manufacturer wrote out the model number such as 9001, or 9101 and the manufacturer's initials. |     2904-9101 V/O Appliance
  2904-9103 Strobe
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