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. 316-995
Mfr. Part No.F4TN0904
MYR87.16
Each
units
Four Pole Double Throw (4PDT) Latching 4 A @ 30 V dc Panel Mount Solder - - - - 6.2mm 10.5mm Chrome Plated Brass - 10mΩ
RS Stock No. 861-0298
Mfr. Part No.C3950BBAAA
MYR31.98
Each
units
DPST Latching 20 A Panel Mount Tab - - - - 12.7mm 17.5mm Metal - -
RS Stock No. 354-3178
Mfr. Part No.S-303T
MYR38.10
Each
units
Single Pole Double Throw (SPDT) On-Off-On 6 A @ 250 V ac, 20 A @ 30 V dc Panel Mount Screw - - - - - 17.5mm Brass - 10mΩ
RS Stock No. 710-9766
Mfr. Part No.3-1825136-8
MYR11.82
Each
units
Single Pole Double Throw (SPDT) Latching 5 A @ 28 V dc PCB Through Hole - - - - 6.35mm 12.19mm Phenolic - 10mΩ
RS Stock No. 199-318
Mfr. Part No.AWTS1504
MYR118.81
Each
units
DPDT (On)-Off-(On) 20 A @ 250 V ac Panel Mount Tab IP67 - - - - 17.5mm Brass - 10mΩ
RS Stock No. 448-0804
BrandRS PRO
MYR22.72
Each
units
Single Pole Double Throw (SPDT) On-Off-On 400 mA @ 20 V PCB Through Hole - - - - - 5.33mm Chrome Plated Brass - 20mΩ
RS Stock No. 354-3061
Mfr. Part No.S-6A
MYR35.79
Each
units
Double Pole Double Throw (DPDT) Latching 20 A@ 125 V ac, 20 A@ 30 V dc Panel Mount Solder - - - - - 17.5mm Brass - 10mΩ
RS Stock No. 710-9820
Mfr. Part No.1825139-1
MYR21.71
Each
units
Double Pole Double Throw (DPDT) On-Off-On 5 A @ 28 V dc Panel Mount Solder - - - - - 16.26mm Phenolic - 10mΩ
RS Stock No. 354-3241
Mfr. Part No.S-822
MYR129.26
Each
units
Double Pole Double Throw (DPDT) Latching 30 A@ 250 V ac, 30 A@ 30 V dc Panel Mount Screw - - - - - 22mm Brass - 10mΩ
RS Stock No. 350-254
Mfr. Part No.C1770HOAAF
MYR41.23
Each
units
Double Pole Double Throw (DPDT) On-Off-On 20 A @ 250 V ac Panel Mount Tab IP40 - - - 12.7mm 16.4mm PC - 100mΩ
RS Stock No. 190-0670
Mfr. Part No.5649A
BrandAPEM
MYR50.19
Each
units
Double Pole Single Throw (DPST) On-Off-On 4 A @ 30 V dc Panel Mount Solder - - - - - - Brass - 10mΩ
RS Stock No. 222-819
Mfr. Part No.ET115A12-Z
MYR27.77
Each
units
SPST On-Off 10 A@ 250 V ac, 15 A@ 125 V ac Panel Mount Solder - - - - - 17mm - - 20mΩ
RS Stock No. 123-2411
Mfr. Part No.5637A17
BrandAPEM
MYR37.43
Each
units
SPDT (On)-Off-On 4 A Panel Mount Solder - - - - 6.5mm 7mm Brass 30V dc 10mΩ
RS Stock No. 124-5946
Mfr. Part No.S7A
MYR33.56
Each
units
DPDT On-Off-On 20 A Panel Mount Solder IP67 - - - 12.5mm 17.5mm Chrome Plated Brass 30 V dc, 250 V ac 10mΩ
RS Stock No. 354-3190
Mfr. Part No.S-332T
MYR48.71
Each
units
Double Pole Double Throw (DPDT) Latching 15 A@ 250 V ac, 15 A@ 30 V dc Panel Mount Screw - - - - - 17.5mm Brass - 10mΩ
RS Stock No. 861-0292
Mfr. Part No.C3960BBAAA
MYR29.17
Each
units
DPDT Latching 20 A Panel Mount Tab - - - - 12.7mm 17.5mm Metal - -
RS Stock No. 394-419
BrandRS PRO
MYR20.30
Each
units
DPDT Latching 5 A @ 250 V ac Panel Mount Solder - - - - - 12.3mm Brass - 10mΩ
RS Stock No. 734-7123
BrandRS PRO
MYR13.62
Each
units
Single Pole Double Throw (SPDT) On-Off-On 5 A @ 250 V ac Panel Mount Solder - - - - 6.35mm 10.41mm Chromium Plated Brass - 10mΩ
RS Stock No. 124-5905
Mfr. Part No.M2011S3S4W01
MYR25.49
Each
units
SPST Latching 4 A @ 30 V dc, 6 A @ 125 V ac PCB Solder - - - - 6.5mm 6.5mm Chrome Plated Brass 30 V dc, 250 V ac 10mΩ
RS Stock No. 283-8992
Mfr. Part No.7201J91ZQE22
BrandC & K
MYR43.09
Each
units
Double Pole Double Throw (DPDT) Latching 5 A @ 28 V dc Panel Mount Solder - - - - - - Nylon - 10mΩ