Spst Off
What type of switch is the power button on a computer?
I don’t know a great deal about electronics, so I’m not sure what the difference is between some of the values below. So what's it's (a computer’s power switch):
contact form -> [2 Circuit ], [2PDT ], [3P ], [3PDT ], [3PST ], [4P ], [4PDT ], [6PDT ], [DB ], [DP ], [DPDT ], [DPST ], [DPST – NC ], [DPST – NO ], [SP ], [SP or DP ], [SP3T ], [SPDT ], [SPDT – DB ], [SPDT – NC ], [SPDT – NO ], [SPST ], [SPST – NC ], [SPST – NO ], [SPST - NO – DB ], [SPST - NO / NC ]
Switch function -> [(ON) - OFF - (ON) ], [(ON) – ON ], [Alternate ], [Latching ], [Maintained ], [Miniature ], [Momentary[NC ], [NC / NO ], [NC Momentary ], [NO ], [NO / NC ], [NO Momentary ], [Push to Lock ]
And what range should its contact current rating fall within?
You want a push-to-make SPST switch. ("Single Pole Single Throw" that makes momentary contact when pushed.
Most toggle switches wont due as they are either in an on or off position. When you flip the toggle on it would keep the circuit closed telling the motherboard to shut down. Example: Holding the power button down on your PC for 10 seconds to do a hard shutdown.
Remember you want a push-to-make switch which is normally open and that closes the circuit momentarily when pressed.
The power running through ATX power switch is usually no higher than 5 volts. Almost any switch that fits the bill in the other departments will do. If your feeling brave you could modify another type of switch to act accordingly.
To sum it up again you most likely want a push-to-make SPST switch.
The link below is a RadioShack model that should do the trick.
http://www.radioshack.com/product/index.jsp?numProdsPerPage=50&y=5&x=22&retainProdsInSession=1&productId=3159591&tab=summary
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 100MINI SPST Toggle ON OFF OFF ON CAR Boat SwitchB101 $54.99 Time Remaining: 1d 38m Buy It Now for only: $54.99 |
 Pack of 5 SPST On Off Toggle Switch 20 Amp K101 5 $9.18 Time Remaining: 1d 10h 42m Buy It Now for only: $9.18 |
 Pack of 3 SPST On Off Toggle Switch 20 Amp K101 3 $6.85 Time Remaining: 1d 21h 13m Buy It Now for only: $6.85 |
 10Push Button SPST Momentary ON OFF Mini Switch107R $5.95 Time Remaining: 1d 23h 54m Buy It Now for only: $5.95 |
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 10 Push Button SPST Momentary ON OFF Mini Switch 107G $5.85 Time Remaining: 2d 15h 5m Buy It Now for only: $5.85 |
 1x SPST OFF ON Heavy Duty 120V 250V Toggle Switch101T $2.84 Time Remaining: 4d 12h 6m Buy It Now for only: $2.84 |
 5 HEAVY DUTY AMPS ON OFF SPST METAL TOGGLE SWITCH1AW $9.99 Time Remaining: 5d 11h 55m Buy It Now for only: $9.99 |
 Carling SPST ON OFF Toggle Switch Tube Amp Guitar1 $3.59 Time Remaining: 5d 12h 22m Buy It Now for only: $3.59 |
 252 pin SPST Toggle ON OFF OFF ON CAR SwitchesB101 $16.00 Time Remaining: 5d 12h 49m Buy It Now for only: $16.00 |
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 2pc SPST OFF ON Wiring Solderless Toggle SwitchBR101 $1.95 Time Remaining: 5d 18h 8m Buy It Now for only: $1.95 |
 4 AMPLIFIER ON OFF SPST Plate Lock TOGGLE SWITCH1WS $9.99 Time Remaining: 5d 18h 45m Buy It Now for only: $9.99 |
 50Enclosure DIY Power ON OFF SPST TOGGLE SWITCH1WS $78.00 Time Remaining: 5d 18h 53m Buy It Now for only: $78.00 |
 2pc SPST OFF ON Wiring Solderless Toggle SwitchBR101 $1.95 Time Remaining: 5d 19h 17m Buy It Now for only: $1.95 |
 50MINI SPST Toggle ON OFF OFF ON CAR Boat SwitchB101 $29.98 Time Remaining: 5d 23h 1m Buy It Now for only: $29.98 |
 Pack of 25 SPST On Off Toggle Switch 20 Amp K101 25 $32.58 Time Remaining: 6d 8h 41m Buy It Now for only: $32.58 |
 1pc SPST OFF ON Heavy Duty 120V 250V Toggle Switch101T $2.85 Time Remaining: 7d 20h 10m Buy It Now for only: $2.85 |
 50p SPST OFF ON Heavy Duty 120V 250V Toggle Switch101T $68.00 Time Remaining: 7d 20h 11m Buy It Now for only: $68.00 |
 SPST Heavy Duty ON OFF Toggle Switch Tube Amp Guitar2 $3.99 Time Remaining: 8d 13h 9m Buy It Now for only: $3.99 |
 10p SPST OFF ON Heavy Duty 120V 250V Toggle Switch101T $16.50 Time Remaining: 8d 13h 54m Buy It Now for only: $16.50 |
 50 Push Button SPST Momentary ON OFF Mini Switch 107G $21.99 Time Remaining: 8d 14h 15m Buy It Now for only: $21.99 |
 50Push Button SPST Momentary ON OFF Mini Switch107BK $21.99 Time Remaining: 8d 14h 24m Buy It Now for only: $21.99 |
 100SPST OFF ON Wiring Solderless Toggle SwitchBR101 $55.00 Time Remaining: 8d 15h 52m Buy It Now for only: $55.00 |
 1p HEAVY DUTY AMPS ON OFF SPST METAL TOGGLE SWITCH1AW $4.99 Time Remaining: 9d 16h 51m Buy It Now for only: $4.99 |
 5x SPST ON OFF Toggle Switch DIY $6.99 Time Remaining: 10d 3h 18m Buy It Now for only: $6.99 |
 SPST Heavy Duty ON OFF CAR BOAT Latching SWITCH701A m $3.95 Time Remaining: 10d 12h 55m Buy It Now for only: $3.95 |
 SPST Heavy Duty ON OFF Toggle Switch Tube Amp Guitar10 $26.99 Time Remaining: 10d 19h 25m Buy It Now for only: $26.99 |
 AMPLIFIER ON OFF SPST Plate Lock TOGGLE SWITCH1WS $2.99 Time Remaining: 11d 16h 16m Buy It Now for only: $2.99 |
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 1000pTactile Push Momentary SPST Off On SwitchTMS s $98.95 Time Remaining: 13d 15h 52m Buy It Now for only: $98.95 |
 SPST Heavy Duty ON OFF CAR BOAT Latching SWITCH701A $5.60 Time Remaining: 14d 12h 40m Buy It Now for only: $5.60 |
 50pcs SPST ON OFF CAR BOAT Battery Power Toggle 701A $138.00 Time Remaining: 16d 16h 12m Buy It Now for only: $138.00 |
 20Push Button SPST Momentary ON OFF Mini Switch107R $10.99 Time Remaining: 16d 20h 34m Buy It Now for only: $10.99 |
 50Push Button SPST Momentary ON OFF Mini Switch107R $21.99 Time Remaining: 16d 20h 36m Buy It Now for only: $21.99 |
 100Push Button SPST Momentary ON OFF Mini Switch107R $35.99 Time Remaining: 16d 20h 37m Buy It Now for only: $35.99 |
 100Push Button SPST Momentary OFF ON N O Switch107G $35.99 Time Remaining: 16d 20h 47m Buy It Now for only: $35.99 |
 100Push Button SPST Momentary OFF ON Switch107BK $35.99 Time Remaining: 16d 20h 52m Buy It Now for only: $35.99 |
 20 Push Button SPST Momentary ON OFF Mini Switch 107G $10.99 Time Remaining: 18d 3h Buy It Now for only: $10.99 |
 5SPST ON OFF CAR BOAT Battery Power Toggle SWITCH701A $14.99 Time Remaining: 19d 13h 39m Buy It Now for only: $14.99 |
 3SPST OFF ON Stomp Switch for HughesKettner Pedal $9.99 Time Remaining: 19d 20h 27m Buy It Now for only: $9.99 |
 50 HEAVY DUTY 120V AMP ON OFF SPST TOGGLE SWITCH1AW $89.00 Time Remaining: 19d 20h 27m Buy It Now for only: $89.00 |
 100SPST OFF ON Wiring Solderless Toggle SwitchBR101 $55.00 Time Remaining: 19d 20h 54m Buy It Now for only: $55.00 |
 100 HEAVY DUTY AMP ON OFF SPST Power TOGGLE SWITCH1AW $175.00 Time Remaining: 19d 21h Buy It Now for only: $175.00 |
 200HEAVY DUTY AMPS ON OFF SPST METAL TOGGLE SWITCH1AW $355.00 Time Remaining: 19d 21h 29m Buy It Now for only: $355.00 |
 100SPST OFF ON Stomp Switch for HughesKettner Pedal $162.00 Time Remaining: 19d 21h 47m Buy It Now for only: $162.00 |
 5PCSTactile Push Momentary SPST Off On Switch2939 $1.99 Time Remaining: 23d 17h 56m Buy It Now for only: $1.99 |
 20Push Button SPST Momentary ON OFF Mini Switch107BK $9.99 Time Remaining: 23d 23h 38m Buy It Now for only: $9.99 |
 10 SPST OFF ON Heavy Duty 120V 250V Toggle Switch101Ts $16.49 Time Remaining: 24d 18h 49m Buy It Now for only: $16.49 |
 PKG15Tactile Push Momentary SPST Off On SwitchTMS s $2.95 Time Remaining: 26d 16h 44m Buy It Now for only: $2.95 |
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 PKG5250V 15A125V 20A ON OFF SPST DIY TOGGLE SWITCH $14.99 Time Remaining: 26d 17h 9m Buy It Now for only: $14.99 |
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 PKG10Tactile Push Momentary SPST Off On SwitchTMS $1.99 Time Remaining: 26d 17h 22m Buy It Now for only: $1.99 |
 30SPST Heavy Duty ON OFF CAR BOAT Latching SWITCH701A $69.99 Time Remaining: 29d 16h 42m Buy It Now for only: $69.99 |
 5SPST Heavy Duty ON OFF CAR BOAT Latching SWITCH701A $14.99 Time Remaining: 29d 16h 44m Buy It Now for only: $14.99 |