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. 475-1982
Mfr. Part No.A-12HV
HK$54.88
Each
units
SPDT Latching 100 mA @ 28 V ac/dc PCB Through Hole - - - - - 6.3mm Brass - 50mΩ
RS Stock No. 164-8732
Mfr. Part No.FTS0904
HK$90.059
Each (In a Box of 100)
units
DPDT (On)-Off-(On) 6 A @ 250 V ac Panel Mount Solder - - - - 6.2mm 10.5mm Chrome Plated Brass - 10mΩ
RS Stock No. 354-3184
Mfr. Part No.S-331T
HK$112.28
Each
units
Double Pole Single Throw (DPST) Latching 15 A@ 250 V ac, 15 A@ 30 V dc Panel Mount Screw - - - - - 17.5mm Brass - 10mΩ
RS Stock No. 103-5502
Mfr. Part No.5638A9
BrandAPEM
HK$118.10
Each
units
Single Pole Single Throw (SPST) On-Off-(On) 4 A @ 30 V dc Panel Mount Solder - - - - - 11.4mm Brass - 10mΩ
RS Stock No. 317-005
Mfr. Part No.FTE0904
HK$84.25
Each
units
Single Pole Double Throw (SPDT) On-Off-On 4 A @ 30 V dc Panel Mount Solder - - - - 6.2mm 10.5mm Chrome Plated Brass - 10mΩ
RS Stock No. 783-1151
Mfr. Part No.MTL106D
HK$154.03
Each
units
Single Pole Double Throw (SPDT) Latching 4 A @ 28 V dc Panel Mount Solder - - - - 0.25in - - -
RS Stock No. 734-7208
BrandRS PRO
HK$31.41
Each
units
Double Pole Double Throw (DPDT) On-Off-On 3 A @ 120 V ac PCB Through Hole - - - - 4.95mm 5.33mm Chromium Plated Brass - 20mΩ
RS Stock No. 734-7198
BrandRS PRO
HK$22.23
Each
units
Double Pole Double Throw (DPDT) Latching 3 A @ 120 V ac PCB Through Hole - - - - 4.95mm 7.37mm Chromium Plated Brass - 20mΩ
RS Stock No. 823-5119
Mfr. Part No.01818.1102-00
BrandMarquardt
HK$47.30
Each
units
SPDT On-Off-(On) 6 A @ 250 V ac Panel Mount Tab IP40 - 18.5mm 13.2mm - 14mm PA - <100mΩ
RS Stock No. 518-5336
Mfr. Part No.Y32CP
BrandAPEM
HK$121.95
Each
units
Double Pole Double Throw (DPDT) On-Off-On 15 A @ 250 V ac Panel Mount Tab - - - - - 17.5mm - - 10mΩ
RS Stock No. 734-7123
BrandRS PRO
HK$23.50
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. 316-989
Mfr. Part No.FTN0904
HK$92.07
Each
units
DPDT Latching 4 A @ 30 V dc Panel Mount Solder - - - - 6.2mm 10.5mm Chrome Plated Brass - 10mΩ
RS Stock No. 306-4849
Mfr. Part No.631H/2-1V
BrandAPEM
HK$226.29
Each
units
Single Pole Single Throw (SPST) Latching 10 A @ 24 V dc Panel Mount Tab - - - - - 19.4mm Nickel Plated Brass - 10mΩ
RS Stock No. 222-819
Mfr. Part No.ET115A12-Z
HK$42.17
Each
units
SPST On-Off 10 A@ 250 V ac, 15 A@ 125 V ac Panel Mount Solder - - - - - 17mm - - 20mΩ
RS Stock No. 417-5451
Mfr. Part No.3631NF/2
BrandAPEM
HK$213.28
Each
units
Single Pole Single Throw (SPST) Latching 12 A Panel Mount Tab IP67 - - - - 17.5mm Brass 28V dc 10mΩ
RS Stock No. 199-0954
Mfr. Part No.MTA206P
HK$109.14
Each
units
Double Pole Double Throw (DPDT) On-Off-On 4 A @ 30 V dc Panel Mount Solder - - - - - 10.5mm - - 10mΩ
RS Stock No. 861-0298
Mfr. Part No.C3950BBAAA
HK$54.48
Each
units
DPST Latching 20 A Panel Mount Tab - - - - 12.7mm 17.5mm Metal - -
RS Stock No. 354-2664
Mfr. Part No.B-13AP
HK$28.62
Each
units
Single Pole Double Throw (SPDT) On-Off-On 100 mA @ 28 V ac/dc PCB Through Hole - - - - - 10mm Brass - 50mΩ
RS Stock No. 350-232
Mfr. Part No.C1750HOAAI
HK$69.64
Each
units
Double Pole Single Throw (DPST) Latching 20 A @ 250 V ac Panel Mount Tab IP40 - - - 12.7mm 16.4mm PC - 100mΩ
RS Stock No. 377-9658
Mfr. Part No.5638A
BrandAPEM
HK$28.35
Each
units
Single Pole Single Throw (SPST) On-Off-(On) 4 A @ 30 V dc Panel Mount Solder - - - - - - Brass - 10mΩ