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. 354-2721
Mfr. Part No.G-12AP
HK$27.34
Each
units
Single Pole Double Throw (SPDT) Latching 100 mA @ 28 V ac/dc PCB Through Hole - - - - - 3.8mm Glass Fibre Reinforced PA - 80mΩ
RS Stock No. 861-0298
Mfr. Part No.C3950BBAAA
HK$46.17
Each
units
DPST Latching 20 A Panel Mount Tab - - - - 12.7mm 17.5mm Metal - -
RS Stock No. 879-8332
Mfr. Part No.2M1-SP1-T1-B1-M2QE
HK$28.75
Each
units
SPST Latching 5 A Panel Mount Through Hole - - - - 6.35 (1/4 Bushing) mm, 11.91 (15/32 Bushing) mm 10.4mm Brass 250V ac 10mΩ
RS Stock No. 306-4849
Mfr. Part No.631H/2-1V
BrandAPEM
HK$204.68
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. 692-5205
Mfr. Part No.5656CDB
BrandAPEM
HK$104.06
Each
units
3-pole on-off switch Latching 400 mA @ 20 V Panel Mount Solder - - - - - - Brass - 10mΩ
RS Stock No. 910-8065
Mfr. Part No.636H
BrandAPEM
HK$72.92
Each
units
SPDT Latching 15 A Panel Mount Screw - - - - 12.2mm 17.5mm Nickel Plated Brass 400V ac 10mΩ
RS Stock No. 879-8121
Mfr. Part No.110-73
HK$41.16
Each
units
SPST Latching 6 A Panel Mount Solder - - - - 12.7mm 17.46mm - 250V ac -
RS Stock No. 394-465
BrandRS PRO
HK$31.91
Each
units
Single Pole Double Throw (SPDT) On-Off-On 5 A @ 250 V ac Panel Mount Solder - - - - - 10.41mm Brass - 10mΩ
RS Stock No. 266-2234
Mfr. Part No.A4TP15W04
HK$448.65
Each
units
Four Pole Double Throw (4PDT) On-Off-On 20 A @ 250 V ac Panel Mount Tab IP67 - - - - 17.5mm Brass - 10mΩ
RS Stock No. 910-8068
Mfr. Part No.631H
BrandAPEM
HK$46.76
Each
units
SPDT Latching 15 A Panel Mount Screw - - - - 12.2mm 17.5mm Nickel Plated Brass 400V ac 10mΩ
RS Stock No. 401-674
BrandRS PRO
HK$27.40
Each
units
Single Pole Double Throw (SPDT) On-Off-On 400 mA @ 20 V PCB Through Hole IP67 - - - - 6.1mm Brass - 20mΩ
RS Stock No. 879-8317
Mfr. Part No.2GM57-73-XA
HK$98.92
Each
units
DPDT On-Off-On 15 A Panel Mount Tab - - - - 12.7mm 17.44mm Brass 250V ac -
RS Stock No. 453-7938
Mfr. Part No.TL-22H1DKYYS1
HK$94.29
Each
units
Double Pole Double Throw (DPDT) Latching 3 A @ 250 V ac Panel Mount Solder IP65 Yes - - 12.5mm 17.5mm PC - 10mΩ
RS Stock No. 692-5239
Mfr. Part No.5659ADBK3V
BrandAPEM
HK$193.24
Each
units
Three Pole Double Throw (3PDT) On-Off-On 4 A @ 30 V dc Panel Mount Solder - - - - 6.5mm 15.1mm Nickel Plated Brass - 10mΩ
RS Stock No. 354-3162
Mfr. Part No.S-302T
HK$55.97
Each
units
Single Pole Double Throw (SPDT) Latching 6 A @ 250 V ac, 20 A @ 30 V dc Panel Mount Screw - - - - - 17.5mm Brass - 10mΩ
RS Stock No. 417-5489
Mfr. Part No.3646NF/2
BrandAPEM
HK$192.17
Each
units
Double Pole Single Throw (DPST) Latching 12 A Panel Mount Tab IP67 - - - - 17.5mm Brass 28V dc 10mΩ
RS Stock No. 317-588
Mfr. Part No.FTN59G04
HK$122.71
Each
units
Double Pole Double Throw (DPDT) Latching 400 mA @ 20 V Panel Mount Solder - - - - 6.2mm 10.5mm Brass - 10mΩ
RS Stock No. 448-0854
BrandRS PRO
HK$39.90
Each
units
Double Pole Double Throw (DPDT) On-Off-On 400 mA @ 20 V PCB Through Hole - - - - - 5.33mm Chrome Plated Brass - 20mΩ
RS Stock No. 745-5716
Mfr. Part No.2-6437630-8
HK$146.34
Each
units
Three Pole Double Throw (3PDT) Latching 6 A @ 250 V ac Panel Mount Solder - - - - 6.2mm 10.5mm Chromium Plated Brass - 10mΩ
RS Stock No. 464-4749
Mfr. Part No.M-2032
HK$67.27
Each
units
3PDT Latching 3 A@ 30 V dc, 6 A@ 125 V ac PCB Through Hole IP67 - - - - - Chromium Plated Brass - 10mΩ
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