12V 40A Relay Switch with Interlocking Back, 5-Pin SPDT Automotive Relay with Removable Metal Bracket, Heavy Duty Power Relay for DRL, Trunk Release, Fans & Marine Use

Master Your Vehicle’s Electronics with Professional SwitchingComplex electrical builds require more than just a simple on/off switch. The Zoyseay 12V 40A 5-Pin Relay provides the sophisticated SPDT logic needed to automate your accessories. Whether you're wiring a trunk release, reversing a motor's polarity, or setting up an auto-switching fan system, this Relay Switch with Back offers the heavy-duty reliability that professionals trust. It’s designed to isolate low-current cabin switches from high-current loads, protecting your dashboard from potential meltdowns.Designed for Clean, Industrial-Grade Installs Messy wiring leads to electrical failures. That’s why we’ve equipped our 5-pin relays with an Interlocking Design. This allows you to stack multiple relays side-by-side, creating a neat and organized power center. The reinforced Removable Metal Bracket ensures a rock-solid attachment to any flat surface, making it an essential component for Automotive, Marine, and DIY hobbyist projects alike. [Image: 5-Pin diagram showing Pin 30, 85, 86, 87, and 87a for SPDT functionality] Technical SpecificationsSwitch Type: SPDT (Single Pole Double Throw)Contact Rating: 40A (N.O.) / 30A (N.C.) @ 12V DCCoil Voltage: 12V DC (Nominal)Contact Material: High-Performance Silver-AlloyTerminals: 5-Pin Standard ISO LayoutMounting: Includes Removable Steel Hanging BracketSuccess Guide for Your Wiring Project (Reducing Returns)1. 4-Pin vs. 5-Pin: This is a 5-Pin Relay Switch. It can replace a 4-pin relay (simply leave the center pin 87a empty), but it offers the added flexibility of a "Normally Closed" circuit which a 4-pin model cannot provide.2. Wiring the Center Pin (87a): Pin 87a is active when the relay is "OFF." This is perfect for accessories that should run when the ignition is off, or for alternating between two different lights.3. Pro-Tip for Longevity: To ensure a Safe and Reliable connection, always use high-quality crimp terminals. Poorly crimped wires are the most common cause of "failed" relays. Our 5-pin layout fits all standard universal relay sockets for a "plug-and-play" experience.

• Versatile 5-Pin SPDT Logic: Engineered for complex electrical tasks. The Zoyseay 40A Relay Switch with Back 12V features a 5-Pin SPDT (Single Pole Double Throw) design, allowing you to switch between two different circuits (Normally Open and Normally Closed). It's the perfect choice for DRL (Daytime Running Light) cut-offs, power door locks, and dual-battery setups in your Automotive or Marine projects.
• Heavy-Duty 40A/30A Performance: Reliable power when you need it most. Our 5-Pin Relay Switch is rated for 40A on the Normally Open contact and 30A on the Normally Closed contact. This Heavy Duty capacity ensures that high-load accessories like cooling fans, fuel pumps, and high-intensity lighting systems operate with Stable and Reliable consistency.
• Modular Interlocking Design: Professional-grade organization for your engine bay. The unique Back design features interlocking rails, allowing multiple relays to be snapped together for a clean, unified "relay bank." Combined with the Removable Metal Bracket, it provides ultimate mounting flexibility for tight spaces in trucks, Jeeps, and RVs.
• High-Conductivity Copper Coils: Precision activation every time. Inside each Zoyseay relay is a high-quality copper coil with excellent thermal stability, ensuring the switch triggers fast and stays engaged without overheating. This reduces voltage drop across the circuit, ensuring your Automotive electronics receive the full power they require.
• Weather-Resistant Rugged Housing: Built for the long haul. Encased in a flame-retardant, impact-resistant shell, this relay acts as a Physical Shield against dust and vibration. Whether it’s mounted in a salty Marine environment or a dusty off-road engine compartment, the internal silver-alloy contacts remain protected for thousands of switching cycles.