RAFI RS 76 M

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RAFI RS 76 M
RAFI RS 76 M.jpg
Manufacturer RAFI
Family RAFI full-travel key switch
Introduced 1975
Switch type Linear; progressive rate; latching action
Sense method Metal contact
Total travel 4 mm
Keycap mount RAFI mount
Switch mount PCB mount

RAFI RS 76 M is a series of metal contact switches in the RAFI full-travel key switch family. It is the mechanical counterpart to the Hall effect RS 76 C, and the 4 mm travel equivalent to RS 74 M. The series comprises standard, illuminated and latching action switches, with linear and progressive rate feel depending on design.

Design

All RS 76 M switches are open top; the diode versions do use a switch top but it leaves most of the internals exposed regardless.

The non-illuminated switches are crosspoint contact. The perimeter loop movable contact used in this design leaves no room for internal LEDs, so the illuminated versions of the switch instead use a "bridge" contact: this comprises a horizontal flat metal bar that is lowered by the slider onto a pair of stationary contacts, one on either side of the switch. To allow for overtravel, this bar sits below a spring, and once it reaches the stationary contacts the slider continues to move, with the spring above the bar being compressed. This gives the switch a progressive rate force curve, and the change in force is sharp enough that keys can be tapped light enough to actuate.

Variants

The RAFI Electromechanical Components 2001 catalogue provided 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.

Sub-series Action IP rating Terminal force Part number
RAFI RS 76 M 502 -- variants table.jpg RAFI RS 76 M (basic) Momentary IP 40 90 cN 3.13.002.502/0000 (2016)
3.13002.502 (2001)
RAFI RS 76 M 512 -- variants table.jpg RAFI RS 76 M (basic) Momentary IP 40 140 cN 3.13.002.512/0000 (2016)
3.13002.512 (2001)
No photograph.svg RAFI RS 76 M (basic) Momentary IP 65 110 cN 3.13012.502 (2001)
No photograph.svg RAFI RS 76 M (basic) Momentary IP 65 160 cN 3.13012.512 (2001)
RAFI RS 76 M 001 -- variants table.jpg RAFI RS 76 M (diode) Momentary IP 40 90 cN 3.13.005.001/0000 (2016)
3.13005.001 (2001)
RAFI RS 76 M 011 -- variants table.jpg RAFI RS 76 M (diode) Momentary IP 40 140 cN 3.13.005.011/0000 (2016)
3.13005.011 (2001)
No photograph.svg RAFI RS 76 M (diode) Momentary IP 65 110 cN 3.13012.001 (2001)
No photograph.svg RAFI RS 76 M (diode) Momentary IP 65 160 cN 3.13012.011 (2001)
RAFI RS 76 M 102 -- variants table.jpg RAFI RS 76 M (illuminated) Momentary IP 40 100 cN 3.13.002.102/0000 (2016)
3.13002.102/0000 (2001)
No photograph.svg RAFI RS 76 M (illuminated) Momentary IP 40 140 cN 3.13.002.107/0000 (2001)
RAFI RS 76 M 022 -- variants table.jpg RAFI RS 76 M (illuminated) Latching IP 40 100 cN 3.13.002.022/0000(2016)
3.13002.022/0000(2001)
RAFI RS 76 MX -- variants table.jpg RAFI RS 76 MX Momentary IP 40 100 cN 3.13.002.922/0000 (2016)

The RAFI Electromechanical Components 2001 catalogue also lists the following dedicated part numbers for the illuminated versions with LEDs fitted:

Action Terminal force LED colour Part number
Momentary 100 cN Red 3.13002.102/1350
Momentary 100 cN Yellow 3.13002.102/1450
Momentary 100 cN Green 3.13002.102/1550
Momentary 140 cN Red 3.13002.107/1350
Momentary 140 cN Yellow 3.13002.107/1450
Momentary 140 cN Green 3.13002.107/1550
Latching 100 cN Red 3.13002.022/1350
Latching 100 cN Yellow 3.13002.022/1450
Latching 100 cN Green 3.13002.022/1550