Spdt Off Momentary
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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 5HEAVY DUTY SPDT ON OFF ON Momentary SWITCHM701 US $14.99 |
 40HEAVY DUTY SPDT ON OFF ON Momentary SWITCHM701 US $98.00 |
 20HEAVY DUTY SPDT ON OFF ON Momentary SWITCHM701 US $49.00 |
 5p Momentary ON OFF ON SPDT Toggle SWITCHBK123 US $7.99 |
 10p Momentary ON OFF ON SPDT Toggle SWITCHBK123 US $13.99 |
 10PCS Momentary Middle OFF On Off On SPDT CAR BOAT 3V 12V Toggle SwitchB123 US $13.88 |
 2pcs SPDT Momentary ON OFF Effect Stomp Foot Switch112P m US $2.84 |
 1PCS Momentary On Off On SPDT 12V 110V 250V Toggle Switch FOR CAR BOATB123 US $1.96 |
 8PCS Momentary On Off On SPDT 12V 110V 250V Toggle Switch FOR CAR BOATB123 US $8.84 |
 15PCS Momentary On Off On SPDT 12V 110V 250V Toggle Switch FOR CAR BOATB123 US $14.84 |
 20PCS Momentary On Off On SPDT 12V 110V 250V Toggle Switch FOR CAR BOATB123 US $18.84 |
 4p Momentary ON OFF ON SPDT Toggle SWITCHB123s US $6.50 |
 2p Momentary ON OFF ON SPDT Toggle SWITCHB123s US $2.99 |
 20p Momentary ON OFF ON SPDT Toggle SWITCHBK123 US $20.98 |
 40p Momentary ON OFF ON SPDT Toggle SWITCHBK123 US $43.98 |
 2 TOGGLE SW SPDT ON OFF ON SWITCH MOMENTARY 15 AMP 15A US $5.48 |
 2 NEW TOGGLE SWITCH SPDT ON OFF ON MOMENTARY 15 AMP 15A US $5.49 |
 20HEAVY DUTY SPDT ON OFF ON Momentary SWITCHM701 US $49.99 |
 5HEAVY DUTY SPDT ON OFF ON Momentary SWITCHM701 US $14.98 |
 HEAVY DUTY SPDT ON OFF ON Momentary SWITCHM701 m US $8.44 |
 100HEAVY DUTY SPDT ON OFF ON Momentary SWITCHM701 US $193.99 |
 2 NEW MINI TOGGLE SPDT ON OFF ON MOMENTARY SWITCH 6 AMP US $3.15 |
 5 TOGGLE SW SPDT ON OFF ON SWITCH MOMENTARY 15 AMPS 15A US $11.49 |
 5PCS Momentary On Off On SPDT 12V 110V 250V Toggle Switch FOR CAR BOATB123 US $5.84 |
 10 BRAND NEW MINI TOGGLE SPDT ON OFF ON MOMENTARY SWITCH 6A 6 A AMP US $9.98 |
 2PC Momentary Middle OFF On Off On SPDT Toggle SwitchB123 n US $3.49 |
 3SPDT Momentary ON OFF Effect Stomp Foot Switch112P US $11.99 |
 HEAVY DUTY SPDT ON OFF ON Momentary SWITCHM701 US $5.60 |
 4pcs Momentary Middle OFF On Off On SPDT Toggle SwitchB123 ay US $6.28 |
 20Momentary Middle OFF On Off On SPDT CAR BOAT 3V 12V Toggle SwitchB123 ay US $24.99 |
 2 NEW SINGLE POLE MINI TOGGLE SPDT ON OFF MOMENTARY SWITCH 6 A AMP 6A ON OFF MOM US $5.99 |
 10 MINI TOGGLE SPDT ON OFF MOMENTARY SWITCH 6 A AMP 6A US $11.99 |
 5 TOGGLE SW SPDT ON OFF ON SWITCH MOMENTARY 15 AMP 15A US $11.49 |
 5pcsSPDT Momentary ON OFF Effect Stomp Foot Switch112P ay US $17.99 |
