Battery Start Relay 500A 12V/24V Product Description
The Battery Start Relay 500A is a high-performance, heavy-duty relay designed for demanding applications such as dual-battery systems, automotive starting systems, and industrial machinery. With a massive contact switching current of 500A , this relay ensures reliable and efficient power delivery in both 12V DC and 24V DC systems. Its robust construction and advanced contact materials make it ideal for extending battery life, preventing primary battery discharge, and ensuring seamless operation in harsh environments.
Key Features
- ⚡ High Power Capacity: Supports a maximum switching current of 500A , making it perfect for high-current applications.
- 🔌 Dual Voltage Compatibility: Works with both 12V DC and 24V DC systems, ensuring versatility across various applications.
- 💪 Durable Contact Material: Made from AgSnO₂-In₂O₃ (Silver Tin Oxide – Indium Oxide) for enhanced durability and low resistance.
- 🌊 Water-Resistant Design: Encased in black phenolic plastic , providing protection against moisture and environmental factors.
- 🔄 Versatile Functionality: Can be used independently or connected to a control system for dual-battery setups.
- 🛡️ Sealed Protection: Ensures reliable performance in dusty, wet, or harsh conditions.
- 📏 Compact and Reliable: Designed for easy integration into automotive, marine, and industrial systems.
Technical Specifications
Applications
- 🚜 Heavy Machinery: Ideal for cranes, bulldozers, and other construction equipment requiring high-current switching.
- 🚗 Automotive Systems: Perfect for dual-battery setups, trucks, buses, and off-road vehicles.
- 🚤 Marine Applications: Suitable for boats and marine systems where water resistance is critical.
- 🔋 Battery Management: Extends battery life and prevents primary battery discharge in dual-battery systems.
- 🎮 DIY Projects: Great for custom controllers, power distribution systems, or hobbyist projects involving high current.
How It Works
- The Battery Start Relay 500A is designed to switch on high-power loads efficiently. It can operate independently or be integrated into a dual-battery system with an external controller (controller not included).
- By isolating the primary battery during non-use, it prevents unnecessary discharge, ensuring your vehicle or equipment starts reliably every time.
Package Includes
- 1x Battery Start Relay 500A (Coil Power: 12V DC / 24V DC)

















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