RAFI RS 76 C
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 | |
| Manufacturer | RAFI |
|---|---|
| Family | RAFI full-travel key switch |
| Product code |
3.13.001.nnn 3.13001.nnn 3.13011.nnn |
| Introduced | 1976[1] |
| Switch type |
Linear, latching |
| Sense method | Hall effect |
| Rated lifetime |
100 M (momentary) 100 k (latching) |
| Total travel | 4 mm |
| Keycap mount | RAFI mount |
| Switch mount | PCB mount |
| Website | www.rafi.de/RS-76-Langhubtaster-zum-Aufbau.165.0.html |
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RAFI RS 76 C is a series of PCB-mount Hall effect switches in the RAFI full-travel key switch family.
Contents
Design
RS 76 C switches use a Hall sensor IC, actuated using a small magnet; the magnet is 2 mm wide, 3 mm tall and 1 mm deep. The magnet fits into a pocket within the slider. The IC provides the switch with four legs; an additional dummy leg is placed at the opposite end of the switch simply to help secure the switch. The momentary switches are damped on the downstroke by a rubber ring placed around the slider guide shaft; this is omitted from the illuminated and latching versions as it would partially block the holes in the base for the LEDs.
The momentary versions typically use yellow sliders, although in the 2016 catalogue they are shown with the same colourless slider as used by the illuminated and latching versions. The Siemens Teleperm ST215 does indeed uses colourless sliders. An anomalous version with a cream slider is depicted below.
The RAFI Electromechanical Components 2001 catalogue provides part numbers for IP 40 and IP 65–rated switches; at present, only IP 40–rated switches are listed in RAFI catalogues. The separate part numbers for different LED colours are also no longer listed.
RS 76 C should not be confused with low-profile ITW magnetic valve switches, which are also open-top and use a very similar keycap mount.
Variants
The series appears to be divided as follows:
- 3.13.001.nnnn — IP40
- 3.13.011.nnnn — IP65
| Action | IP rating | Illuminated | Terminal force | Part number | |
|---|---|---|---|---|---|
 |
Momentary | IP 40 | No | 70 cN | 3.13.001.010/0000 (2016) 3.13001.010 (2001) |
 |
Momentary | IP 40 | No | 100 cN | 3.13.001.210/0000 (2016) 3.13001.210 (2001) |
 |
Momentary | IP 65 | No | 100 cN | 3.13011.010 (2001) |
|
Momentary | IP 65 | No | 130 cN | 3.13011.210 (2001) |
 |
Momentary | IP 40 | Yes | 70 cN | 3.13.001.110/0000 (2016) 3.13001.110/0000 (2001) |
|
Momentary | IP 65 | Yes | 110 cN | 3.13011.110/0000 (2001) |
 |
Latching | IP 40 | Yes | 70 cN | 3.13.001.130/0000 (2016) 3.13001.130/0000 (2001) |
|
Latching | IP 65 | Yes | 110 cN | 3.13011.130/0000 (2001) |
The RAFI Electromechanical Components 2001 catalogue also lists the following dedicated part numbers for the illuminated versions:
| Action | IP rating | LED colour | Part number |
|---|---|---|---|
| Momentary | IP 40 | None | 3.13001.110/0000 |
| Momentary | IP 40 | Red | 3.13001.110/1350 |
| Momentary | IP 40 | Green | 3.13001.110/1550 |
| Momentary | IP 40 | Yellow | 3.13001.110/1450 |
| Momentary | IP 65 | None | 3.13011.110/0000 |
| Momentary | IP 65 | Red | 3.13011.110/1350 |
| Momentary | IP 65 | Green | 3.13011.110/1550 |
| Momentary | IP 65 | Yellow | 3.13011.110/1450 |
| Latching | IP 40 | None | 3.13001.130/0000 |
| Latching | IP 40 | Red | 3.13001.130/1350 |
| Latching | IP 40 | Green | 3.13001.130/1550 |
| Latching | IP 40 | Yellow | 3.13001.130/1450 |
| Latching | IP 65 | None | 3.13011.130/0000 |
| Latching | IP 65 | Red | 3.13011.130/1350 |
| Latching | IP 65 | Green | 3.13011.130/1550 |
| Latching | IP 65 | Yellow | 3.13011.130/1450 |
Keyboards
- RAFI B6-C
- RAFI B8-C
- RAFI 401.002.159
- Siemens Teleperm ST215 (white sliders)[2]
Gallery
RS 76 C from the side, in an older RAFI B6-C keyboard
3.13.001.010/0000
Sample received from RAFI in 2016.
Typical yellow RS 76 C, 70 cN version (3.13.001.010/0000)
Magnet partially removed from the slider
Redundant leg, held between a ramp and retaining steps
Fully disassembled, top views
Fully disassembled, bottom views
3.13.001.210/0000
Sample received from RAFI in 2016. This is identical to 010 except for having a heavier spring:
Spring comparison, 010 vs 210
Anomalous cream version
Anomalous cream RS 76 C switch
Bottom side of the switch; IC legs on the left hand side
Disassembled switch; the red line on the IC marks the border between the rest position and the activated position.
The RS 76 C slider has an extension with a pocket for the magnet.
References
- ↑ Electronic Design 25 (1976), Nr. 22, p. 102: A new switching technique for keyboard system RS 76 uses a Hall-effect IC to ensure that switching is bouncefree and reliable.
- ↑ Deskthority — Siemens Teleperm ST215
