Electrical switches. Top, left to right: circuit breaker, mercury switch, wafer switch, DIP switch, surface mount switch, reed switch. Bottom, left to right: wall switch (U.S. style), miniature toggle switch, in-line switch, push-button switch, rocker switch, microswitch.A toggle switch in the "on" position.Triple Pole Single Throw (TPST or 3PST) switch used to short the windings of a 3 phase wind turbine for braking purposes. Here the switch is shown in the open position.
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A switch is a device for changing the course (or flow) of a circuit. The prototypical model is a mechanical device (for example a railroad switch) which can be disconnected from one course and connected to another. more...

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The term "switch" typically refers to electrical power or electronic telecommunication circuits. In applications where multiple switching options are required (e.g., a telephone service), mechanical switches have long been replaced by electronic variants which can be intelligently controlled and automated.

The switch is referred to as a "gate" when abstracted to mathematical form. In the philosophy of logic, operational arguments are represented as logic gates. The use of electronic gates to function as a system of logical gates is the fundamental basis for the computer—i.e. a computer is a system of electronic switches which function as logical gates.

A simple electrical switch

In the simplest case, a switch has two pieces of metal called contacts that touch to make a circuit, and separate to break the circuit. The contact material is chosen for its resistance to corrosion, because most metals form insulating oxides that would prevent the switch from working. Sometimes the contacts are plated with noble metals. They may be designed to wipe against each other to clean off any contamination. Nonmetallic conductors, such as conductive plastic, are sometimes used. The moving part that applies the operating force to the contacts is called the actuator, and may be a toggle or dolly, a rocker, a push-button or any type of mechanical linkage (see photo).

A simple semiconductor switch is a transistor.

Contact arrangements

A pair of contacts is said to be 'closed' when there is no space between them, allowing electricity to flow from one to the other. When the contacts are separated by a space, they are said to be 'open', and no electricity can flow.

Switches can be classified according to the arrangement of their contacts. Some contacts are normally open until closed by operation of the switch, while others are normally closed and opened by the switch action. A switch with both types of contact is called a changeover switch.

The terms pole and throw are used to describe switch contacts. A pole is a set of contacts that belong to a single circuit. A throw is one of two or more positions that the switch can adopt. These terms give rise to abbreviations for the types of switch which are used in the electronics industry. In mains wiring names generally involving the word way are used; however, these terms differ between British and American English and the terms two way and three way are used in both with different meanings.

Read more at Wikipedia.org


Hp Procurve 4000M J4115B 10/100/1000 Base-T Module $80.00 Hp Procurve J4862B 24 Port 10/100-T 4104 4108 Gl Module $99.00
Hp Procurve 4000M J4113A Gigabit Sx Module New In Box $115.00 Hp Procurve Xl 5308Xl 5348Xl J4819A 4x J4820A J4839A $1,875.00
Hp Procurve Xl 5304Xl J4850A 2x J4820A J4878A J4839A $1,575.00 Cisco 1900 Series Network Switch Ws-C1924-En $14.99
Cisco Workgroup Stack Catalyst 3000 16 Ports $19.99 New Usb 2.0 4 Port Manual Sharing Switch Box, 059 $2.24
Cisco Catalyst 3500 Series Xl Ws-C3508-Xl-En w/8 Gbics $77.77 Complete Ccie Voice Lab $13,500.00
Dell 3348 Ethernet Switch 48-Pt 10/100, 2-Pt Gigabit $84.99 Cisco 2950 Ws-C2950T-24 Port Catalyst Switch $144.49
Netgear ProSafe Fs726Tp 24Port 10/100 Smart Switch w/2G $99.99 Netgear Fs750At 48 Ports 10/100 Fast Ethernet Switch $99.90
Trendnet Teg-S80Txe 8-Port 10/100/1000 Mbps Switch $9.99 Usb Powered Mini 5-Port 10/100 Ethernet Lan Switch $7.95
Cisco Ds-X9032 32-Port 1/2G Fc Module Mds 9000 Series $199.99 Cisco Catalyst 2950 Series 24-port Switch Ws-C2950-24 $119.99
Cisco Catalyst 2900 Switch Ws-C2924M-Xl-En $9.99 Linksys 5-port Workgroup switch $8.99
Cisco Catalyst 3550 Switch Ws-C3550-24-Smi Running Emi $389.00 D-Link Des-1105 Ethernet Switch Brand New $13.99
Dell Powerconnect 2216-R5 *New In Box* $9.99 Lot of 2 New Finisar Hssdc Copper Fibre Channel Gbic $14.44
Lot of 2 Finisar Sc Optical Multi-Mode 1000Base-Sx Gbic $9.99 New Finisar 1000Base-T Copper Fibre Channel Gbic $44.44
Lot of 8 New Finisar 2gb Sfp [Lc Optical Sx mini-Gbic] $88.88 D-Link 24-Port Dgs-1024D 10/100/1000 Gigabit Rackmounta $161.99
Ccie Lab Study Guide $36.99 Emc Qlogic Ds-16A SanBox16 Fibre Channel Switch 16port $99.00
Enterasys Matrix 1H582-51 48-Port Switch 1G-2Gbic $14.99 D-Link 10/100 Fast Ehternet Switch Dss-8+ w/ power adpt $21.99
Dell Powerconnect 3324 24 Port 10/100 Switch $14.99 At&T Code Operated Switch Sc0S4 $50.00
Adtran Netvanta T1 Nim, Gen 2 - New in sealed package $75.00 Netgear Jgs524 Prosafe 24-Port Gigabit Rackmount Switch $119.95
8-Ports 10/100 Lan Ethernet Network Desktop Switch/Hub $19.99 Extreme Networks Summit 24e3 (13201) - 24 Port Switch $100.00
Cisco Catalyst Xl 3500 Series Switch Ws-C3548-Xl-En $119.99 Cisco Catalyst 3500 Series Ws-C3512-Xl-En Switch 3512 $14.99
Cisco Catalyst 3500 Ws-C3548-Xl-En Switch $49.99 Cisco Catalyst 2900 Series Ws-C1924-En-Dc Switch 2912 $14.99
Cisco Catalyst Switch Ws-C1924-En | Ccna | $24.95 Cisco Catalyst 1900 Series Ws-C1924-En $11.11
Dell Powerconnect Rps-600 w/ Cables Power Connect F2538 $69.99 Cisco 24 Port PoE Switch, Ws-C3524-Pwr-Xl-En $139.99
Cisco 3560 Fast Ethernet Switch - 48x10/100Base Tx Lan $2,950.00 New Dell PowerConnect 5224 Managed Gigabit Switch $329.99
New PowerConnect 3324 24-Pt 10/100 4-Pt Gigabit Switch $99.99 New Dell PowerConnect 3348 Managed 48Pt Ethernet Switch $249.99
*New* Cisco Ws-C2955S-12 2955S 2955, Tnet 10x Available $1,995.00 Cisco Ws-C3550-48-Emi Ws C 3550 48Emi, Tnet 3xAvailable $945.00
Hp J4121A ProCurve Switch 400M with 40 Ports $40.00 Symbol Es 3000-Pwr Ethernet Switch Es3000 10/100 2x1000 $99.00
Netgear Fast Ethernet Switch $15.00 Dell PowerConnect 3348 48 Port 10/100 Managed Switch $100.00
Cisco Ws-C3550-24-Fx-Smi w/ Emi 3550 24Fx, Tnet 2xAvail $795.00 Cisco 2950G 48 port switch, 2 Gbic ports Ei , 2950 $366.34
Netgear ProSafe 24 Port 10/100 Smart Switch $79.95 Smc Tigerstack Ii 48Pt 10/100/1000 Gigabit Switch 8848M $495.00
Linksys 10/100 5 port network hub $25.00 Cisco Catalyst Ws-C3550-12T 12 Ports Switch $199.99
Cisco 3560 24 port PoE Switch (ws-c3560-24ps-s), Ccie $1,831.80 Hp ProCurve module J4862B for switch 4108gl $120.00
Hp ProCurve switch 4108gl J4865A 1x J4839A + 1x J4863A $450.00 Hp ProCurve module J4864A for switch 4108gl 4104gl $65.00
J9001A Hp ProCurve Wireless Edge Services xl Module New $1,700.00 J8702A Hp ProCurve 24Port switch 5400zl module PoE $1,550.00
New Dell PowerConnect 3424P PoE Switch 24-Pt 10/100 4Gb $349.99 New Dell PowerConnect 2716 Managed Switch 16 Pt Gigabit $149.99
Cisco Catalyst Switch: ws-c2924-xl $15.00 Lot of 4 Cisco Ws-C2948G Catalyst 2948G 48-Port $189.99
Linksys 5 Port Workgroup Switch (New) $10.00 Gyyr Digiscan Ds16D $9.99
Cabletron SmartStack 24-port Ethernet Els10-27Tx Switch $19.00 Gyyr Digiscan Pro Dsp16C Model Dsp16C-Gy-A $9.99
Brocade Br-3902-0001 Silkworm 3900 32-Port Switch $2,495.00 Tp-Link Tl-Sg1005D 5-Port Desktop Gigabit Switch $25.99
New Tp-Link 10/100 48-Ports Ethernet Network Switch/Hub $119.99 Hirschmann 5-Port Rail Mounted Industrial Switch New $195.00
Netopia Cayman 3500 Series Broadband Gateway $10.00 Tp-Link 10/100 5-Ports Rj45 Ethernet Network Switch/Hub $16.99
Dell Powerconnect 3248 48 Port Networt Switch w/ 2 Gbic $122.00 Dell Powerconnect 2216 16 Port Networt Switch Hub 100 ! $32.00
Tp-Link 8-Ports 10/100 Ethernet Network Switch/Hub Rj45 $19.99 Lot of 3 Netgear Fs516 16-Port 10/100 Switches $29.95
Hp ProCurve Switch 400M With 40x Rj45 10/100 Prt J4111A $159.99 Usb 2.0 Sharing Switch 2 Port Hub for Printer Scanner $9.89
Dell PowerConnect 5212 12 Port 10/100/1000 Gb Switch $100.00 Linksys 5 port Etherfast Workgroup Switch Brand New $4.99
OnQ 364781-01, 8 Port 10/100 Ethernet Network Switch $9.99 Netgear Fsm726 L2 Managed Switch with 2 Gigabit Ports $99.95
Cisco Ws-C2950-24 switch $50.00 Netgear Fs524 24 Port 10/100Mbps Fast Ethernet Switch $54.95
Netgear Jfs524 24-Port Unmanaged 10/100 Network Switch $34.95 Catalyst Ws-C3560-48Ts-S $1,300.00
Enterasys 1H582-51 48-port Matrix Ethernet Switch w/1G $79.99 3Com Superstack Powered Ethernet 24 Port Switch 3C17205 $100.00
2 Adc Fiber Bays $199.00 New Iogear Wall-Plug Powerline Networking Kit Ghpb32W4 $74.99
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Prices current as of last update, 08/28/08 3:31am.


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