Hella Relay 12V 20/40A SPDT Diode — Universal Automotive Relay

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SKU: HELLA007794047
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Car Wheel Size Chart

Wheel Diameter (inches) Tire Width (mm) Aspect Ratio Rim Width (inches)
14185655.5
15195606.0
16205556.5
17215507.0
18225457.5
19235408.0
20245358.5

Note: Wheel and tire sizes vary by car make and model. Always consult your vehicle’s manufacturer for exact specifications.

How to Read Tire Size

Example: 225/45R17 means:

  • 225 = Tire width in mm
  • 45 = Aspect ratio (height as % of width)
  • R17 = Rim diameter in inches

Product Details

Product Description
Part Numbers
Sizing & Fit

About Hella

Hella engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full Hella lineup with fast shipping and expert fitment support — order with confidence.

Watch in action

Precision Electrical Control with Hella SPDT Diode Relays

The Hella 12V 20/40A SPDT (Single Pole Double Throw) Relay with integrated diode is designed for advanced automotive electrical applications. Featuring a diode to suppress voltage spikes, this relay is essential for protecting your vehicle's sensitive electronic control units (ECUs) and wiring harnesses during switching operations. It is the ideal choice for demanding circuits such as headlight cleaning systems, starters, and complex auxiliary lighting setups.

Technical Specifications and Advantages

  • Diode Protection: Built-in diode prevents back-EMF, safeguarding your vehicle's electrical infrastructure.
  • Versatile Switching: SPDT configuration allows for both normally open and normally closed operations.
  • High Performance: Rated for 20A/40A, providing the flexibility needed for various automotive loads.
  • Global Standard: Manufactured by the seventh-largest OEM supplier, ensuring perfect fit and function.
  • Compliance: Meets strict ISO and environmental standards including ROHS and REACh.

Hella relays are synonymous with longevity and consistent performance. By choosing this diode-protected relay, you are investing in the same technology used by major automotive manufacturers on the assembly line. Whether you are troubleshooting an electrical issue or building a custom circuit, this relay provides the reliability you need. Trust GGCRACING for all your automotive electrical requirements.

Product Details

Product Description
Part Numbers
Sizing & Fit

About Hella

Hella engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full Hella lineup with fast shipping and expert fitment support — order with confidence.

Watch in action

Precision Electrical Control with Hella SPDT Diode Relays

The Hella 12V 20/40A SPDT (Single Pole Double Throw) Relay with integrated diode is designed for advanced automotive electrical applications. Featuring a diode to suppress voltage spikes, this relay is essential for protecting your vehicle's sensitive electronic control units (ECUs) and wiring harnesses during switching operations. It is the ideal choice for demanding circuits such as headlight cleaning systems, starters, and complex auxiliary lighting setups.

Technical Specifications and Advantages

  • Diode Protection: Built-in diode prevents back-EMF, safeguarding your vehicle's electrical infrastructure.
  • Versatile Switching: SPDT configuration allows for both normally open and normally closed operations.
  • High Performance: Rated for 20A/40A, providing the flexibility needed for various automotive loads.
  • Global Standard: Manufactured by the seventh-largest OEM supplier, ensuring perfect fit and function.
  • Compliance: Meets strict ISO and environmental standards including ROHS and REACh.

Hella relays are synonymous with longevity and consistent performance. By choosing this diode-protected relay, you are investing in the same technology used by major automotive manufacturers on the assembly line. Whether you are troubleshooting an electrical issue or building a custom circuit, this relay provides the reliability you need. Trust GGCRACING for all your automotive electrical requirements.

Product Details

Product Description

About Hella

Hella engineers high-quality automotive parts and accessories trusted by enthusiasts and shops across North America. At GGCRACING we stock the full Hella lineup with fast shipping and expert fitment support — order with confidence.

Watch in action

Precision Electrical Control with Hella SPDT Diode Relays

The Hella 12V 20/40A SPDT (Single Pole Double Throw) Relay with integrated diode is designed for advanced automotive electrical applications. Featuring a diode to suppress voltage spikes, this relay is essential for protecting your vehicle's sensitive electronic control units (ECUs) and wiring harnesses during switching operations. It is the ideal choice for demanding circuits such as headlight cleaning systems, starters, and complex auxiliary lighting setups.

Technical Specifications and Advantages

  • Diode Protection: Built-in diode prevents back-EMF, safeguarding your vehicle's electrical infrastructure.
  • Versatile Switching: SPDT configuration allows for both normally open and normally closed operations.
  • High Performance: Rated for 20A/40A, providing the flexibility needed for various automotive loads.
  • Global Standard: Manufactured by the seventh-largest OEM supplier, ensuring perfect fit and function.
  • Compliance: Meets strict ISO and environmental standards including ROHS and REACh.

Hella relays are synonymous with longevity and consistent performance. By choosing this diode-protected relay, you are investing in the same technology used by major automotive manufacturers on the assembly line. Whether you are troubleshooting an electrical issue or building a custom circuit, this relay provides the reliability you need. Trust GGCRACING for all your automotive electrical requirements.

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