5-Pin 12V 40A Automotive Waterproof Relay

📝 5-Pin 12v 40A Automotive Waterproof Relay

This 5-pin 12v automotive waterproof relay is designed for high-current switching, safety protection, and reliable circuit control in demanding vehicle and off-road environments. With a 40A switching capacity and SPDT (single pole double throw) configuration, it supports both normally open and normally closed applications in a single compact unit.

Built with flame-retardant materials and sealed construction, this relay is well suited to installations exposed to moisture, vibration, and heat in automotive, caravan, marine, and industrial setups.

⭐ Essential Benefits

• 40A high-current capability – suitable for demanding electrical loads.
• 5-pin SPDT configuration – supports normally open or normally closed operation.
• Waterproof sealed design – suitable for harsh and exposed environments.
• Flame-retardant ABS housing – improves safety and long-term durability.
• Oxygen-free copper wiring – ensures low resistance and reliable conductivity.
• Pre-wired pigtail harness – cleaner installs and easier fault diagnosis.
• Secure mounting design – suitable for complex installation locations.

⚙️ Functionality

This relay operates as a single pole double throw (SPDT) unit, allowing power to be switched between normally open and normally closed outputs depending on application requirements.

When triggered, the relay safely controls high-current loads using a low-current control signal. The sealed base and fixed back strip help protect against moisture ingress while maintaining stability in vibration-prone installations.

🔌 Applications

• Lighting circuits and light bars
• Cooling fans and pumps
• Winches and traction control systems
• Audio systems and accessories
• Starter and ignition-related circuits
• Automotive, marine, caravan, and off-road builds

🧰 Installation Difficulty

🟢 2/5 (Easy)
Supplied with pre-wired pigtail for quick connection and clean installation.

🔍 Features

• 5-pin SPDT automotive relay
• Normally open and normally closed outputs
• Waterproof sealed base
• Flame-retardant ABS housing
• Oxygen-free copper conductors
• Pre-wired socket and pigtail harness

📊 Specifications

Wire colour reference:
• Black – Ground (85)
• White – Trigger (86)
• Yellow – VDC input (30)
• Red – Normally open output (87)
• Blue – Normally closed output (87a)

📦 What’s Included

• 1 × 5-pin 12v 40A waterproof automotive relay
• 1 × pre-wired relay socket and pigtail harness

🙌 Why Choose This Product?

This relay delivers reliable, high-current switching with built-in environmental protection, making it ideal for both everyday vehicle electrics and demanding off-road or marine applications. The sealed design and pre-wired harness help ensure a tidy, professional installation every time.

🚀 Our Promise

Order today for same-day dispatch and explore our full range of automotive electrical components and accessories.