FR Electronics RSM 82-1A

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FR Electronics RSM 82-1A
FR Electronics RSM 82-1A -- infobox.jpg
Manufacturer FR Electronics
Switch type Linear

FR Electronics RSM 82-1A is a reed switch, using a design very similar to Unitra Dolam M-24-112.


The base of the switch has six holes for terminals: four for two reed modules (likely providing DPST rather than double-action) and two for illumination which line up with channels in the centre shaft that hold a lamp. An FR-branded illuminated version has never been seen, but the RRE illuminated counterpart is RRE RKS 80-1AL.

"1A" likely indicates 1 form A (SPST NO); whether "RSM" or "RSM 82" indicates the name of the series remains unknown. The DPST version is presumably RSM 82-2A.


The identity of the series is not known. Racal used RSM 83-1A for the front panel of the RA1792 radio receiver;[1] this is a heavier switch than RSM 82-1A. Additional part numbers exist with the "RSM" prefix; related part numbers appear to include RSM62-1A, RSM62-1AL (using a 28 V lamp), RSM82-1A, RSM82-2AX and RSM83-1A. Whether RSM 6x and RSM 8x are the same or separate series cannot be determined.[2] Note that an "L" suffix for a lamp applies to these part numbers also.


The base of the switch can be removed by prying open the switch using a thin blade.

The reed unit terminals appear to push into the base of the switch from the outside, making the reed assembly non-removable. The reed capsule itself is attached to the terminals using a seemingly invisible amount of solder, or some other visually non-detectable process.


  • Plessey Displays keyboard, ca. 1984[3]