What Is a Toggle Switch?
A toggle switch is a latching switch that changes position by flipping a small lever one way and keeps its position.
How It Works
While the lever is in one position the internal contacts are connected a certain way; when the lever is flipped to the other position the contact state changes and stays there on release (latching). This is how it differs from a momentary button.
| Config. | Function |
|---|---|
| SPST | Simple on/off |
| SPDT | Selecting one of two paths |
| DPDT | Routing two circuits together |
Number of Positions
There are two-position (ON-OFF) or three-position (ON-OFF-ON) types. In three-position ones the middle position is usually "off"; this combines two separate modes and a neutral state in one switch.
Where Is It Used?
Device power switches, control panels, measurement instruments, amplifiers and the front panels of industrial equipment. It's robust and visually shows the position clearly.
Current Rating
Toggle switches usually carry higher current than tactile switches; still, in power switching beyond the rated value the contact life shortens and arcing occurs.
Mounting and Protection
Toggle switches are usually passed through a hole in the panel and fixed with a nut. If used outdoors, a rubber boot over the lever makes it water/dust protected. The lever length and nut diameter must be chosen for the panel thickness to be used.
Common Mistakes
- Overcurrent: connecting a load above the switch rating.
- Confusing positions: overlooking the middle (off) position in a three-position type.
- Inductive load: skipping arc suppression with a motor/relay load.
Frequently Asked Questions
What's the difference between a toggle and a button?+
What is ON-OFF-ON for?+
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