Optimized Overcurrent Protection for Telecom and Control Circuits: The FPT Fuse
When dealing with overcurrent protection in telecommunications or control circuits, OptiFuse’s FPT and FPT-C series is a capable solution optimized to manage arcs and ensure reliable circuit isolation. The FPT family is engineered to interrupt both AC and DC fault currents, and its construction illustrates how design choices can assist arc suppression under challenging conditions:
Highlights:
- High interrupting ratings: 300 A @ 125 VAC / 125 VDC, 450 A @ 60 VDC
- Alarm indication: Supports LED or audio alarms for blown fuse detection, reducing downtime in complex systems
- Durable body: PPS housing (UL94V-0 rated) with transparent polycarbonate cover for visibility
- Fuse cover (-C variant): Clear removable cover adds flexibility and protection against contaminants
- Color-coded amperages: Industry-standard coloring makes ratings easy to identify at a glance
Typical Applications:
- Telecom, control, and signal circuits where AC and DC may coexist
- Backup power systems and battery-fed lines
- Compact enclosures needing fast-acting, inspection-ready overcurrent protection
- Sub-circuits, power desks, or interface modules with moderate fault currents
Why Choose the FPT Series?
The FPT line combines robust interrupting performance with alarm-indication features and compact design. Whether you need clear blown-fuse visibility, alarm circuit integration, or a removable cover for safety, the FPT / FPT-C provides flexibility and reliability for telecom and control applications.
To understand how FPT interrupts fault currents, see our blog on the fundamentals of how a fuse works. To learn how to select the right fuse for your specific needs, see our Fuse Selection Guide for complete context
Sebastian Castañeda, Application Engineer at OptiFuse, supports customers with technical solutions, custom circuit protection design, and training. He provides tailored guidance and shares expert insights on the OptiFuse Blog.