Editing Cherry miniature open

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{{infobox dswitch
| image name          = 
| manufacturer        = [[Cherry]]
| switch type         = Clicky
| contact mechanism   = [[Metal contact]]
| actuation force     = 
| introduced          = 
| peak force          = 
| keycap mount        = None
| patents             = [https://www.google.com/patents/US3056002 US 3056002] (1959)
}}

'''Miniature open''' is a type of "[[mousetrap switch]]" from [[Cherry]] primarily intended for mains switching. Miniature open is a smaller version of the largely identical '''basic open''' type.

==Description==
Series S30 standard miniature open switches are mains power switches rated for 10 A at 125 VAC, and 5 A at 250 VAC; as such, they cannot use [[gold crosspoint]] contacts, and instead use flat contacts. Series S31 comprises gold crosspoint variants intended for low-energy circuits.

Being lever action switches, both basic open and miniature open switches do not accept keycaps.

==Variants==
Multiple S30 types exist, including standard and narrow panel, multiple terminal types and multiple configurations. The part numbers according to the [[Cherry catalogues|Cherry Switches & Keyboards Catalog C-73]] are as follows:

'''S'''-'''UPT'''

;S
:Series: S30 — mains, S31 — low energy
;U
:Unknown (can be 0, 2 or 5)
;P
:Poles and throws: 0 — SPDT (changeover), 1 — SPST NO, 2 — SPST NC
;T
:Terminals: P — "PCB" (tubes, narrow type only), W — integral solder, T — flat solder, Z — quick connect

The codes above do not differentiate between wide and narrow base switches. "Integral solder" terminals are vertical with notches cut into either side; "quick connect" terminals have diagonal corners and no notches. "Flat solder" terminals protrude horizontally, with holes punched through them.

The default form of all miniature open switches is SPDT.

[[NOS]] switches with part number 01APBSW have been found. This type is a wide-base gold crosspoint switch with integral solder terminals. No evidence is given for the part number<ref name="DT" />

===Gold crosspoint===
The only gold crosspoint type listed in the C-73 catalogue is S31-20P, is specified as follows:

{| class="wikitable"
! Characteristic        !! Value
|-
| Operating force       || 7.5 oz (213 g) max
|-
| Rest position         || 0.533&Prime; ‪(13.5 mm) max
|-
| Pretravel             || None
|-
| Operating point       || 0.378&Prime; (‪9.6 mm)
|-
| Overtravel            || 0.045&Prime; (1.14 mm) min
|-
| Movement differential || 0.850&Prime; (‪21.6 mm)
|}

==Keyboards==
No confirmed examples exist. The [[Computer Communications 303]] keyboard has switches virtually identical to catalogue depictions of Cherry Series S31 (with the only visible difference being a steeper actuator arm). Unlike S31-20P, the switches in this keyboard are simple SPST NO; one possible part number could be S31-21P.<ref name="DT" />

==References==
<references>
<ref name="DT">Deskthority — [https://deskthority.net/photos-f62/the-original-cherry-keyboard-switch-t11362.html The "Original" Cherry Keyboard Switch?]</ref>
</references>

[[Category:Cherry switches]]
[[Category:Metal contact switches]]
[[Category:Clicky switches]]
[[Category:List of all keyboard switches]]