When 70A Current Protection Becomes a Life-and-Death Battle
In 2022, a fire accident at a photovoltaic energy storage station in Jiangsu shocked the industry – improper DC-side protection caused RMB 8 million in losses. This incident highlighted the critical role of Zhongrong RS309-MM-70A in modern power systems. Designed specifically for new energy applications, this 70A rated current fuse has become the standard protection component for over 15 EV manufacturers including BYD and NIO.
Three Core Advantages That Rewrote Industry Standards
- Ultra-Fast Response: Achieves arc extinction within 2ms at 500VDC, 30% faster than conventional models
- Extreme Environment Endurance: Stable operation from -40°C to 125°C, verified in Xinjiang desert power stations
- Space-Efficient Design: 30% smaller footprint compared to similar products, solving layout challenges in compact EV battery packs
Real-World Protection: From Battery Packs to Charging Piles
In the 2023 Guangzhou energy storage project, 2,368 RS309-MM-70A units successfully blocked 17 chain reaction failures. A CATL engineer revealed: ‘During thermal runaway tests, these fuses limited temperature rise to 58°C below safety thresholds.’ The component’s unique silver-alloy fusible element ensures 0.1Ω ultra-low resistance while maintaining protection accuracy within ±5%.
The Future of Smart Protection
With 68 patent certifications and 200,000+ field applications, Zhongrong’s latest iteration integrates IoT monitoring – early warning accuracy reaches 92.7%. As one BYD engineer commented: ‘It’s not just a fuse, but a intelligent safety sentinel for our battery management systems.’
