Cummins engine parts Insurance relay assembly box C5633022

Built as the core protection unit of the engine’s electrical system, this assembly box integrates dual safety mechanisms: fuses and relays. The fuses (rated current 5-30A) use fast-blow ceramic materials to cut off circuits within 0.1s when overcurrent occurs (e.g., short circuits in the starter motor), preventing wire overheating and fire. The relays (10A/20A contact current) act as power switches, isolating high-current loads from the ECU to avoid damage to precision electronic components. A built-in voltage stabilizer maintains output voltage at 24±0.5V, protecting sensitive devices like fuel injectors and sensors from voltage fluctuations. This integrated protection reduces electrical system failure rates by 70% compared to non-OE relay boxes

Engineered to endure the harsh mechanical environment of heavy-duty vehicles, the assembly box features a robust construction. The outer casing is made of impact-resistant ABS plastic (tensile strength 45MPa) with internal reinforcement ribs, resisting deformation from accidental impacts (10J impact test passed). The internal relay and fuse sockets are made of heat-resistant PA66 plastic, operating stably at temperatures up to 120℃. All electrical connections use tin-plated copper terminals (conductivity ≥58MS/m) with crimping and soldering dual fixation, ensuring low contact resistance (≤10mΩ) and preventing loose connections. The box’s IP67 waterproof rating (per IEC 60529) blocks dust and water ingress, suitable for off-road and rainy working conditions

Optimized for long-term reliability, the box integrates efficient heat dissipation and corrosion resistance features. The casing’s surface is designed with 20 heat-dissipating ribs, increasing heat dissipation area by 40% and keeping internal temperature ≤80℃ even when all relays are active. The terminals and internal conductors undergo nickel plating (10μm thickness), passing 1000-hour neutral salt spray testing (ASTM B117) to prevent rust and corrosion from road salt or moisture. The ABS casing is resistant to chemical corrosion from engine oil, coolant, and cleaning agents, with no cracking or discoloration after 500-hour immersion testing. These features ensure the box’s service life reaches ≥300,000km in diverse operating environments

The assembly box is designed for efficient maintenance and long-term cost savings. A transparent, snap-on cover allows visual inspection of fuses and relays without disassembly, reducing troubleshooting time by 60%. The relay and fuse sockets use color-coded labels (e.g., red for 30A fuses, blue for 10A relays) that match Cummins’ wiring diagrams, simplifying replacement. The box’s modular design allows individual replacement of faulty relays/fuses instead of the entire assembly, cutting repair costs by 80%. By preventing electrical system failures, it avoids expensive downtime (e.g., a truck stranded due to starter circuit issues) and reduces ECU repair costs (up to $2,000). Backed by a 2-year/250,000km warranty, it provides reliable support for fleet and construction operations