Littelfuse TR5 Antisurge Time Delay Fuse, Radial Leaded, 50mA 250V

The Littelfuse TR5 372 Series is a range of sub-miniature, radial-leaded, time-delay (antisurge) fuses designed for reliable circuit protection in compact electronic applications. Engineered to meet stringent international safety standards, including IEC 60127-3, these fuses are ideal for safeguarding sensitive components against overcurrent and surge conditions.

Their primary function is to provide a delayed blow characteristic, allowing temporary current surges (such as those from motor startups or capacitive inrush) to pass without interrupting the circuit, while still protecting against sustained overloads or short circuits. This makes them perfect for protecting transformers, power supplies, and other inductive or capacitive loads.

The fuse features a radial leaded design, offering two simple installation methods: it can be soldered directly onto a printed circuit board (PCB) for a permanent, space-saving connection, or plugged into a compatible two-pin socket for easy testing and replacement. Its sub-miniature size significantly reduces the PCB footprint, a critical advantage in modern, densely packed electronics.

Constructed with a shock-safe and vibration-resistant casing, the fuse ensures dependable performance even in demanding industrial environments. It boasts a low internal resistance for minimal power loss and is approved by major global safety organisations, including UL, VDE, PSE/JET, and CCC, guaranteeing its quality and reliability for worldwide use.

With a high breaking capacity of up to 35A AC, it can safely interrupt substantial fault currents. The operating temperature range of -40°C to 85°C ensures stable performance across a wide variety of climatic conditions, from freezing cold to high heat.