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. 861-0309
Mfr. Part No.C3972BBAAA
TWD243.00
Each
units
Double Pole Double Throw (DPDT) (On)-Off-(On) 20 A Panel Mount Tab - - - - 12.7mm 17.5mm Metal - -
RS Stock No. 320-972
Mfr. Part No.5666A9
BrandAPEM
TWD366.00
Each
units
4P On-On 4 A @ 30 V dc Panel Mount Solder - - - - - 11.4mm Brass - 10mΩ
RS Stock No. 350-254
Mfr. Part No.C1770HOAAF
TWD151.00
Each
units
Double Pole Double Throw (DPDT) On-Off-On 20 A @ 250 V ac Panel Mount Solder, Tab IP40 - - - 12.7mm 16.4mm PC - 100mΩ
RS Stock No. 164-8730
Mfr. Part No.FTD59G04
TWD315.30
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. 448-0747
BrandRS PRO
TWD53.20
Each (In a Pack of 5)
units
Single Pole Double Throw (SPDT) Latching 5 A @ 28 V dc Panel Mount Solder - - - - 6.35mm 10.41mm Chromium Plated Brass - 10mΩ
RS Stock No. 317-572
Mfr. Part No.FTD59G04
TWD329.00
Each
units
SPDT Latching 400 mA @ 20 V Panel Mount Solder - - - - 6.2mm 16.5mm Chrome Plated Brass - 10mΩ
RS Stock No. 710-9870
Mfr. Part No.4-1825139-0
TWD269.00
Each
units
Double Pole Double Throw (DPDT) On-On-On 5 A @ 28 V dc PCB Through Hole - - - - - 17.5mm Phenolic - 10mΩ
RS Stock No. 164-1983
Mfr. Part No.4-1825139-0
TWD180.00
Each (In a Bag of 100)
units
Double Pole Double Throw (DPDT) On-On-On 5 A @ 28 V dc PCB Through Hole - - - - - 17.5mm Phenolic - 10mΩ
RS Stock No. 820-0523
BrandRS PRO
TWD292.00
Each
units
Double Pole Double Throw (DPDT) On-On-On 5 A @ 250 V ac PCB Solder Lug IP67 - - - - 18mm Brass - 10mΩ
RS Stock No. 762-5189
Mfr. Part No.ATE1H-6M3-10-Z
TWD82.00
Each
units
Single Pole Double Throw (SPDT) On-Off-(On) 50 mA@ 48 V ac/dc PCB Right Angle Through Hole - - - - - 6mm - - 50mΩ
RS Stock No. 190-0658
Mfr. Part No.5639A
BrandAPEM
TWD125.00
Each
units
Single Pole Single Throw (SPST) On-Off-On 4 A @ 30 V dc Panel Mount Solder - - - - - - Brass - 10mΩ
RS Stock No. 518-5314
Mfr. Part No.Y12CP
BrandAPEM
TWD255.00
Each
units
Double Pole Single Throw (DPST) Latching 15 A @ 250 V ac Panel Mount Tab - - - - - 17.5mm - - 10mΩ
RS Stock No. 401-686
BrandRS PRO
TWD70.00
Each
units
SPDT Latching 400 mA @ 20 V PCB Through Hole IP67 - - - - 6.1mm Brass - 20mΩ
RS Stock No. 354-5988
Mfr. Part No.S2A
TWD104.00
Each
units
- - - PCB - - - - - - - - - -
RS Stock No. 401-670
BrandRS PRO
TWD38.00
Each
units
Single Pole Double Throw (SPDT) On-Off-On 5 A @ 250 V ac PCB Through Hole - - - - - 10.41mm Brass - 10mΩ
RS Stock No. 354-5994
Mfr. Part No.S3A
TWD116.00
Each
units
- - - PCB - - - - - - - - - -
RS Stock No. 518-5308
Mfr. Part No.X32CP
BrandAPEM
TWD209.00
Each
units
Single Pole Double Throw (SPDT) On-Off-On 15 A @ 250 V ac Panel Mount Tab - - - - - 17.5mm - - 10mΩ
RS Stock No. 734-7154
BrandRS PRO
TWD36.00
Each
units
Single Pole Single Throw (SPST) Latching 5 A @ 28 V dc Panel Mount Solder - - 6.86mm 12.7mm - 10.4mm Chrome Plated Brass 28V dc 10mΩ
RS Stock No. 354-3027
Mfr. Part No.S-303
TWD175.00
Each
units
- - - - Solder - - - - - 17.5mm Brass - 10mΩ
RS Stock No. 354-2535
Mfr. Part No.A-12AH
TWD99.00
Each
units
Single Pole Double Throw (SPDT) Latching 100 mA @ 28 V ac/dc PCB Through Hole - - - - - 10mm Brass - 50mΩ