Bourns SinglFuse 3812 Slow Blow Fuse, 600V AC, 125V DC, 1.25A

The Bourns SinglFuse™ Telefuse™ SF-3812TM125T-2 is a time-lag (slow-blow) fuse designed for overcurrent protection in telecommunication circuits requiring low current protection with high surge tolerance. It meets Telcordia GR-1089-CORE Issue 4 and UL 60950 requirements, ensuring reliable performance in demanding telecom environments.

This fuse features a ceramic tube construction for durability and reliability, and comes in a compact 3812 (EIA 3812 / 10030 metric) footprint for surface-mount applications. It is UL 248-14 listed, RoHS compliant, and halogen-free, making it an environmentally conscious choice.

Key Specifications

• Rated current: 1.25A
• Rated voltage: 600V AC / 125V DC
• Interrupting rating: 60A @ 600V AC, 60A @ 250V AC, 50A @ 250V DC, 100A @ 125V DC
• Typical resistance: 0.100 Ω
• Typical I²t: 22 A²s
• Max power dissipation: 0.6W
• Fusing time: Opens within 1–120 sec at 250% rated current
• Operating temperature: -55°C to +125°C
• Moisture Sensitivity Level: 1 (ideal for automated assembly)

The SF-3812TM125T-2 is designed for telecom applications, offering excellent surge tolerance and ensuring circuit protection in compact, surface-mount designs.