What is an ON-ON Switch?
Understanding Double Throw Toggle Switches
Definition & Function
An ON-ON switch, also known as a Single Pole Double Throw (SPDT) switch, is a type of toggle switch that has two stable positions - both of which are "ON" positions. Unlike a standard ON-OFF switch, there is no "OFF" position in an ON-ON switch.
Key Characteristics:
- Two stable operating positions
- Single pole, double throw configuration
- Always maintains circuit connection
- Alternates between two different circuits
![ON-ON Switch Wiring Diagram](https://switchesmfg.com/wp-content/uploads/2025/12/Single-Pole-Double-Throw.jpg")
How It Works
Position 1 (ON)
Switch connects the common terminal to the first output terminal, completing circuit A.
Switching
When toggled, the switch breaks connection with circuit A and immediately connects to circuit B.
Position 2 (ON)
Switch connects the common terminal to the second output terminal, completing circuit B.
Common Applications
Fan Speed Control
Switching between high and low speed settings
Direction Control
Motor forward/reverse operation
Signal Routing
Audio/video input selection
Lighting Control
Switching between different light circuits
Power Source Selection
Alternating between main and backup power
Marine Applications
Bilge pump manual/automatic control
Terminal Configuration
Standard Wiring
- Common Terminal: Input connection point
- Terminal 1: First output circuit
- Terminal 2: Second output circuit
Electrical Ratings
- Voltage: Typically 125V-250V AC
- Current: 10A-20A depending on model
- Contact Type: Silver alloy contacts
WEUP ON-ON Switches
As a professional switch manufacturer since 1987, WEUP produces high-quality ON-ON toggle switches with UL, VDE/TUV, and CE certifications. Our switches are designed for reliability in household appliances, automotive applications, and marine environments.