DPDT vs SPDT vs SPST Rocker Switch Explained: Differences, Wiring & Applications

👉 Explore our KCD Rocker Switch Series for more options.

What is SPST, SPDT, and DPDT?

• SPST (Single Pole Single Throw)
  → Simple ON-OFF switch (2 pin)
• SPDT (Single Pole Double Throw)
  → Switch between two circuits (3 pin)
• DPDT (Double Pole Double Throw)
  → Control two circuits simultaneously (6 pin)

Quick summary:

• SPST = ON / OFF
• SPDT = A / OFF / B
• DPDT = Dual A / OFF / Dual B

Switch Structure Comparison

Wiring Differences Explained

• SPST wiring: simple series connection for power ON/OFF
• SPDT wiring: one common terminal switches between two outputs
• DPDT wiring: dual circuits switch simultaneously, often used for reversing polarity

Typical use case: DPDT switches are commonly used for motor forward/reverse control.

Applications Comparison

• SPST Switch
  • Power ON/OFF control
  • Household appliances
  • Basic electrical circuits
• SPDT Switch
  • Mode selection
  • Signal switching
  • Audio routing
• DPDT Switch
  • Motor forward/reverse control
  • Dual circuit systems
  • Industrial automation

Summary:
SPST is used for basic switching, SPDT for selecting between circuits, and DPDT for complex multi-circuit control.

How to Choose the Right Rocker Switch

When selecting a rocker switch, consider:

• Circuit complexity
• Number of outputs required
• Voltage and current rating
• Application type (consumer or industrial)

Quick selection guide:

• Simple ON/OFF → SPST
• Two-way switching → SPDT
• Dual circuit control → DPDT

Why Choose Our Rocker Switch

• Professional SPST SPDT DPDT rocker switch manufacturer with a complete product range
• OEM / ODM customization for 2 pin, 3 pin, and 6 pin rocker switch projects
• Reliable panel mount power switches for appliances and industrial systems
• High-quality dual circuit rocker switch factory in China with strict QC standards
• Durable rocker switch solutions for motor control and automation applications
• Fast delivery and global B2B supply support

FAQ

Q1: What is the difference between SPST, SPDT, and DPDT?
SPST controls one circuit, SPDT switches between two outputs, and DPDT controls two circuits simultaneously.

Q2: What is a DPDT rocker switch used for?
It is commonly used for motor reversing and dual circuit control applications.

Q3: How many pins does each switch type have?
SPST has 2 pins, SPDT has 3 pins, and DPDT has 6 pins.

Q4: Which rocker switch is best for simple ON/OFF control?
SPST is the best choice for simple ON-OFF applications.

Q5: Can rocker switches be customized?
Yes, OEM/ODM customization is available for all switch types, including terminals, ratings, and design.