Toggle Switches

Toggle switches are among the most basic and most common of all electronic components, the switch moves contacts that either provide a path for current to flow through or moves those contacts in such a way that the path is cut. The toggle switches most people will be familiar with are light switches.

How Does a Toggle Switch Function?
Toggle switches may vary a bit in function from one to the next depending upon their configurations. However, the basics are the same.
When the actuator (the toggle itself) is moved, the armature in the switch moves the contact into position either energizing the circuit or de-energizing it. Once the switch is moved from one position to the other, it typically stays that way. There are also momentary switches, which energize or de-energize a circuit for as long as they are actuated and then go back to their normal state once the actuator is released. This is accomplished via a spring mechanism that exerts a force on the armature from the inside.

Contact Configuration of a Toggle Switch
  • A single pole single throw (SPST) switch is the simplest and most common type of toggle switch. These switches allow simple on and off operation for a single circuit. Most light switches are SPST switches.
  • Single pole double throw (SPDT) switches can be used to change where a voltage is directed. The double throw means that the switch can be used to energize two different circuits - one at a time - from a single source of energy.
  • Double pole single throw (DPST) switches allow an operation that is very similar to having two SPST switches hooked together in one device. The switch can turn two circuits on and off. These are very convenient when more than one device needs to be controlled with the same switch.
  • Double pole double throw (DPDT) switches allow two different circuits to be served by the same pole. These are used in applications where a circuit may need to have changing voltages applied to connected devices.

There are also switches with the designation CO, such as SPCO (single pole changeover) switches. These have an off position in the middle of the switch and can be used to energize or de-energize two different circuits attached to the device.

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Description Price Contact Configuration Switch Operation Contact Current Rating Mounting Type Terminal Type IP Rating Illuminated Panel Cut Out Width Panel Cut Out Height Panel Cut Out Diameter Actuator Length Actuator Material Voltage Rating Contact Resistance
RS Stock No. 710-9876
Mfr. Part No.3-1825139-9
£5.72
Each
Units
DP3T On-On-On 5 A @ 28 V dc Panel Mount Through Hole - - - - 6.35mm 10.41mm Phenolic - 10mΩ
RS Stock No. 316-973
Mfr. Part No.FTD0904
£5.55
Each
Units
Single Pole Double Throw (SPDT) Latching 4 A @ 30 V dc Panel Mount Through Hole - - - - 6.2mm 11.5mm Chrome Plated Brass - 10mΩ
RS Stock No. 316-973A
Mfr. Part No.FTD0904
£2.943
Each (In a Pack of 25)
Units
Single Pole Double Throw (SPDT) Latching 4 A @ 30 V dc Panel Mount Through Hole - - - - 6.2mm 11.5mm Chrome Plated Brass - 10mΩ
RS Stock No. 199-318
Mfr. Part No.AWTS1504
£18.22
Each
Units
Double Pole Double Throw (DPDT) (On)-Off-(On) 20 A @ 250 V ac Panel Mount Tab IP67 - - - - 17.5mm Brass - 10mΩ
RS Stock No. 135-4437
Mfr. Part No.AWTS1504
£16.566
Each (In a Box of 100)
Units
Double Pole Double Throw (DPDT) (On)-Off-(On) 20 A @ 250 V ac Panel Mount Tab IP67 - - - - 17.5mm Brass - 10mΩ
RS Stock No. 783-0968
Mfr. Part No.A105MYV30Q04
£4.04
Each
Units
Single Pole Double Throw (SPDT) (On)-Off-(On) 5 A @ 28 V dc Through Hole Vertical Through Hole - - - - - - - - -
RS Stock No. 317-421
Mfr. Part No.AWTD1504
£16.59
Each
Units
Single Pole Double Throw (SPDT) Latching 20 A @ 250 V ac Panel Mount Tab IP67 - - - - 17.5mm Brass - 10mΩ
RS Stock No. 135-4445
Mfr. Part No.AWTD1504
£11.522
Each (In a Box of 100)
Units
Single Pole Double Throw (SPDT) Latching 20 A @ 250 V ac Panel Mount Tab IP67 - - - - 17.5mm Brass - 10mΩ
RS Stock No. 316-989A
Mfr. Part No.FTN0904
£3.698
Each (In a Pack of 25)
Units
Double Pole Double Throw (DPDT) Latching 4 A @ 30 V dc Panel Mount Through Hole - - - - 6.2mm 10.5mm Chrome Plated Brass - 10mΩ
RS Stock No. 316-989
Mfr. Part No.FTN0904
£4.07
Each
Units
Double Pole Double Throw (DPDT) Latching 4 A @ 30 V dc Panel Mount Through Hole - - - - 6.2mm 10.5mm Chrome Plated Brass - 10mΩ
RS Stock No. 164-8695
Mfr. Part No.AWTN1504
£14.119
Each (In a Box of 100)
Units
Double Pole Double Throw (DPDT) Latching 20 A @ 250 V ac Panel Mount Tab IP67 - - - - 17.5mm Brass - 10mΩ
RS Stock No. 317-437
Mfr. Part No.AWTN1504
£18.77
Each
Units
Double Pole Double Throw (DPDT) Latching 20 A @ 250 V ac Panel Mount Tab IP67 - - - - 17.5mm Brass - 10mΩ
RS Stock No. 317-847
Mfr. Part No.AWTP1504
£33.49
Each
Units
Double Pole Double Throw (DPDT) On-Off-On 20 A @ 250 V ac Panel Mount Tab IP67 - - - - 17.5mm Brass - 10mΩ
RS Stock No. 135-4446
Mfr. Part No.AWTP1504
£23.626
Each (In a Bag of 100)
Units
Double Pole Double Throw (DPDT) On-Off-On 20 A @ 250 V ac Panel Mount Tab IP67 - - - - 17.5mm Brass - 10mΩ
RS Stock No. 316-995
Mfr. Part No.F4TN0904
£12.34
Each
Units
Four Pole Double Throw (4PDT) Latching 4 A @ 30 V dc Panel Mount Through Hole - - - - 6.2mm 10.5mm Chrome Plated Brass - 10mΩ
RS Stock No. 317-572
Mfr. Part No.FTD59G04
£10.54
Each
Units
Single Pole Double Throw (SPDT) Latching 400 mA @ 20 V Panel Mount Solder - - - - 6.2mm 16.5mm Chrome Plated Brass - 10mΩ
RS Stock No. 164-8730
Mfr. Part No.FTD59G04
£8.154
Each (In a Box of 100)
Units
Single Pole Double Throw (SPDT) Latching 400 mA @ 20 V Panel Mount Solder - - - - 6.2mm 16.5mm Chrome Plated Brass - 10mΩ
RS Stock No. 344-710A
Mfr. Part No.FTPA0904
£8.638
Each (In a Pack of 25)
Units
Double Pole Double Throw (DPDT) On-On-On 4 A @ 30 V dc Panel Mount Through Hole - - - - 6.2mm 16.5mm Chrome Plated Brass - 10mΩ
RS Stock No. 344-710
Mfr. Part No.FTPA0904
£13.53
Each
Units
Double Pole Double Throw (DPDT) On-On-On 4 A @ 30 V dc Panel Mount Through Hole - - - - 6.2mm 16.5mm Chrome Plated Brass - 10mΩ
RS Stock No. 266-2206
Mfr. Part No.A4TK15W04
£60.77
Each
Units
Four Pole Single Throw (4PST) Latching 20 A @ 250 V ac - Solder, Tab IP67 - - - - 17.5mm Brass - 10mΩ