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Built to Endure: The Ultimate Heavy-Duty 12V Control SolutionWhen the road gets rough and the environment gets tough, plastic brackets simply don't cut it. The Zoyseay Relay Switch with Iron Back is designed for the serious enthusiast who demands structural integrity. By combining a Heavy Duty 40A internal mechanism with a rugged metal mounting tab, we’ve created a relay that excels in the vibrating engine bays of Cars, Trucks, and Marine vessels. This is the Gold Standard for securing your 12V electrical infrastructure.Advanced SPDT Logic for Custom Modifications The 5 Pin Relay 12v Switch is the Swiss Army Knife of electronics. Whether you are automating a trunk release or setting up a kill switch for a security system, the SPDT architecture allows for infinite customization. The Iron Back ensures that even under the constant torque of heavy cable harnesses, the relay remains stable. Wengart (Zoyseay) focuses on high-conductivity silver-alloy contacts to ensure your **Automotive** power remains Safe and Reliable, trip after trip. [Image: Close-up of the Iron Back bracket and the 5-pin layout clearly labeled] Technical SpecificationsCoil Voltage: 12V DC (Nominal)Contact Capacity: 40A (N.O.) / 30A (N.C.)Pin Configuration: 5-Pin SPDT (Single Pole Double Throw)Bracket Material: Reinforced Zinc-Plated IronContacts: Silver-Alloy (Anti-Arcing)Application: Horns, Fans, Fuel Pumps, Off-Road Lighting, MarineElectrician's Pro-Tips (Reducing Returns & Ensuring Safety)1. Why the Iron Back? If you are mounting your relay in an exposed area or a high-vibration zone (like near the firewall or on a boat deck), the Iron Back is essential to prevent the mounting tab from snapping over time.2. Wire Management: This relay fits all standard 5-pin relay sockets. To ensure a Safe and Reliable connection, we recommend using high-quality 10-12 AWG wire for the 40A load terminals (30 and 87).3. Understanding 87a: The center pin (87a) is powered when the relay is OFF. This is perfect for accessories that need to run automatically when the vehicle is shut down, or for switching between two sets of lights. Industrial-Grade Iron Back Support: Engineered for extreme vibration. The Zoyseay Relay Switch with Iron Back 12V features a heavy-duty metal mounting bracket that provides a rock-solid attachment point. Unlike flimsy plastic tabs, our Reinforced Iron Back withstands the intense jolts of off-road racing, heavy trucking, and nautical environments, ensuring your relay stays exactly where you mounted it. Versatile 5 Pin SPDT Functionality: Take control of complex circuits. This 5 Pin Relay 12v Switch offers a Single Pole Double Throw (SPDT) configuration, allowing you to alternate between two different devices (Normally Open and Normally Closed). It is the professional choice for DRL switch-backs, reversing polarity, and controlling dual-fan systems in Automotive and Marine setups. Massive 40A/30A Switching Power: High-current reliability you can trust. Rated to handle 40A on the main contact (87) and 30A on the secondary (87a), this relay protects your delicate dashboard switches from high-inrush currents. Ideal for powering Heavy Duty accessories like high-pressure fuel pumps, air compressors, and high-wattage LED bars without thermal failure. Precision Copper Coil & Silver Contacts: Built for zero-lag switching. Inside each Zoyseay relay is a high-density copper coil that ensures rapid engagement, paired with silver-alloy contacts to prevent arcing and welding. This combination ensures a Safe and Reliable connection over thousands of cycles, maintaining consistent performance in your Automotive electronics. Safe and Seamless Installation: Designed with the installer in mind. The Iron Back bracket features smooth, deburred edges to prevent injury and wire chafing. With a standard ISO pin layout, it is a universal drop-in replacement for most factory relays, providing a professional look and a secure fit for your DIY Projects. ASIN B0FRMRCPKS Model ZYRY01 Brand Name ZOYSEAY Part Number B1 Contact Type Normally Closed Manufacturer ZOYSEAY Mounting Type Wall Mount Connector Type Plug-In Current Rating 40 Amps Contact Material Copper Specification Met CE Included Components 2Pack Relay Switch and Harness