Bussmann 25LET Fuses: Key Features, Application Cases, and Selection Guide

In today’s industrial and energy systems, circuit protection components like the Bussmann 25LET fuse play a critical role in ensuring safety and reliability. Designed for high-speed circuit interruption, this 25LET series fuse from Eaton’s Bussmann portfolio has become a go-to solution for engineers working with solar inverters, EV charging stations, and industrial motor drives. Let’s explore why it stands out. With a 100kA breaking capacity at 700VDC (according to UL 248-19), the 25LET excels in high-energy environments. A solar farm project in California recently deployed these fuses in 1,500V DC combiner boxes, where they successfully protected against arc faults caused by module degradation. The fuse’s ceramic sand-filled construction ensures stable performance across -50°C to +125°C, crucial for outdoor applications. For EV charging stations, a European manufacturer reported 30% fewer false trips after switching to 25LET fuses, thanks to their precise time-current characteristics. When selecting, match the I²t value to your system’s surge requirements – for example, the 25LET-600 model handles 0.006 A²s minimum melting energy. Always verify local certifications; the 25LET series carries UL, CSA, and IEC approvals for global compliance.