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. 401-692
BrandRS PRO
HK$20.97
Each
units
DPDT On-Off-On 5 A @ 28 V dc PCB Through Hole - - - - - 10.41mm Chromium Plated Brass - 10mΩ
RS Stock No. 518-5291
Mfr. Part No.X12CP
BrandAPEM
HK$52.93
Each
units
Single Pole Single Throw (SPST) Latching 15 A @ 250 V ac Panel Mount Tab - - - - - 17.5mm - - 10mΩ
RS Stock No. 320-922
Mfr. Part No.5639A9
BrandAPEM
HK$46.02
Each
units
SP On-Off-On 4 A @ 30 V dc Panel Mount Solder - - - - - 11.4mm Brass - 10mΩ
RS Stock No. 350-204
Mfr. Part No.C1700HOAAG
HK$30.13
Each
units
SPST Latching 16 A @ 250 V ac Panel Mount Solder, Tab IP40 - - - 12.7mm 16.4mm PC - 100mΩ
RS Stock No. 692-5223
Mfr. Part No.5646ADBK2V
BrandAPEM
HK$126.19
Each
units
Double Pole Double Throw (DPDT) Latching 4 A @ 30 V dc Panel Mount Solder - - - - 6.5mm 14.75mm Nickel Plated Brass - 10mΩ
RS Stock No. 135-4437
Mfr. Part No.AWTS1504
HK$152.612
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. 316-917
Mfr. Part No.21136NA
BrandAPEM
HK$48.24
Each
units
SP On-On 4 A @ 30 V dc PCB Through Hole - - - - - 11.5mm Brass - 20mΩ
RS Stock No. 394-419
BrandRS PRO
HK$34.31
Each
units
DPDT Latching 5 A @ 250 V ac Panel Mount Solder - - - - - 12.3mm Brass - 10mΩ
RS Stock No. 199-318
Mfr. Part No.AWTS1504
HK$179.20
Each
units
DPDT (On)-Off-(On) 20 A @ 250 V ac Panel Mount Tab IP67 - - - - 17.5mm Brass - 10mΩ
RS Stock No. 787-4820
Mfr. Part No.7101SYZQE
BrandC & K
HK$38.12
Each
units
Single Pole Single Throw (SPST) Latching 5 A @ 28 V dc Through Hole Solder Lug - - - - - 0.42in Chrome Plated Brass - 10mΩ
RS Stock No. 879-8421
Mfr. Part No.61115929-0-0-N
HK$31.243
Each (In a Pack of 52)
units
Double Pole Single Throw (DPST) Latching 4 A @ 250 V ac Panel Mount Solder - - 19.8mm 12.9mm 12.7mm - - - -
RS Stock No. 448-0898
BrandRS PRO
HK$24.72
Each
units
Single Pole Double Throw (SPDT) Latching 400 mA @ 20 V PCB Through Hole - - - - - 5.33mm Chrome Plated Brass - 20mΩ
RS Stock No. 819-9322
Mfr. Part No.MTG 206 S
HK$88.31
Each
units
Double Pole Double Throw (DPDT) (On)-Off-(On) 4 A @ 30 V dc Panel Mount Solder Tag - - - - 12.5mm 11.5mm - - <20mΩ
RS Stock No. 316-973
Mfr. Part No.FTD0904
HK$46.56
Each
units
SPDT Latching 4 A @ 30 V dc Panel Mount Through Hole - - - - 6.2mm 11.5mm Chrome Plated Brass - 10mΩ
RS Stock No. 692-5214
Mfr. Part No.5659CDB
BrandAPEM
HK$85.98
Each
units
3-pole on-off switch On-Off-On 400 mA @ 20 V Panel Mount Solder - - - - - - Brass - 10mΩ
RS Stock No. 448-0775
BrandRS PRO
HK$21.984
Each (In a Pack of 5)
units
Double Pole Double Throw (DPDT) On-Off-On 5 A @ 28 V dc Panel Mount Solder - - - - 6.35mm 10.41mm Chromium Plated Brass - 10mΩ
RS Stock No. 419-849
BrandRS PRO
HK$14.71
Each
units
Single Pole Single Throw (SPST) Latching 16 A @ 125 V ac Panel Mount Tab - Yes - - 20.2mm 16mm PC - 50mΩ
RS Stock No. 762-5489
Mfr. Part No.FT1D-4M-Z
HK$22.68
Each
units
Single Pole Double Throw (SPDT) Latching 0.4 VA@ 28 V dc PCB Vertical Through Hole - - - - - 3.8mm - - 100mΩ
RS Stock No. 741-1000
Mfr. Part No.1821.6101
BrandMarquardt
HK$37.40
Each
units
Single Pole Single Throw (SPST) Latching 6 A @ 250 V ac - Solder IP40 - - - - 14mm Polyamide - 100mΩ
RS Stock No. 354-3156
Mfr. Part No.S-301T
HK$53.62
Each
units
Single Pole Single Throw (SPST) Latching 6 A @ 250 V ac, 20 A @ 30 V dc Panel Mount Screw - - - - - 17.5mm Brass - 10mΩ
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