Littelfuse TR5 372 Series Time Delay Fuse, 125 mA, 250 V, Radial Leaded

The Littelfuse TR5 372 Series offers a sub-miniature, time-delay (slow-blow) radial leaded fuse, engineered to provide reliable circuit protection for a wide range of electronic and industrial applications. With a precise current rating of 125 mA and a rated voltage of 250 VAC, this component is designed to safeguard sensitive circuits by introducing a deliberate delay before interrupting the circuit, allowing for harmless, temporary current surges typical in equipment start-up without causing nuisance blows.

Constructed in accordance with the IEC 60127-3 standard, this fuse series boasts approvals from major international safety bodies including UL, VDE, PSE/JET, and CCC, ensuring global compliance and reliability. The radial leaded design allows for flexible installation; it can be soldered directly onto a printed circuit board (PCB) or mounted using a compatible two-pin socket, facilitating both permanent and replaceable solutions. Its compact dimensions help reduce PCB space requirements, a critical factor in modern, densely packed electronics.

Key performance features include a low internal resistance for minimal voltage drop, a shock-safe casing for enhanced user safety, and vibration-resistant construction for durability in demanding environments. Available with a breaking capacity of 35A, it can safely interrupt high fault currents. The component operates reliably across a broad temperature range from -40°C to 85°C, making it suitable for use in challenging conditions.

Ideal Applications

This time-delay fuse is particularly suited for protecting transformers, motors, solenoids, and power supplies where inrush currents are common. Its robust design and international approvals make it a preferred choice for industrial control systems, safety equipment, telecommunications hardware, and consumer electronics where consistent and dependable overcurrent protection is paramount.