What is a Single Pole Double Throw (SPDT) Switch?
Basic Definition
A Single Pole Double Throw (SPDT) switch is an electrical switch that has one input terminal (pole) and two output terminals (throws). It allows you to connect one input to either of two different outputs, but never both simultaneously.
Key Characteristics
One input connection point
Two possible output connections
Only one output active at a time
How It Works
The SPDT switch has three terminals: one common terminal (C) and two switching terminals typically labeled as Normally Open (NO) and Normally Closed (NC). When the switch is in one position, the common terminal connects to the NC terminal. When actuated, it breaks that connection and makes a new connection to the NO terminal.
Common Applications
- Three-way light switches
- Motor direction control
- Signal routing in electronics
- Safety interlocks
- Audio/video switching
Advantages
- Versatile switching capability
- Reliable operation
- Cost-effective solution
- Simple wiring requirements
- Available in various sizes
WEUP's SPDT Switch Solutions
As a professional switch manufacturer with over 35 years of experience, WEUP produces high-quality SPDT switches that meet international standards including UL, VDE/TUV, ENEC, and CE certifications.