Littelfuse 4 A Resettable Fuse 30V DC Radial Lead RUEF400

The Littelfuse RUEF400 is a 4 ampere Resettable Fuse designed for DC circuit protection up to 30 volts. Featuring a radial lead orientation, this polyswitch fuse offers automatic resetting capability thousands of times, eliminating the need for fuse replacement. It rapidly switches from a low resistance state to a high resistance state upon excessive current detection, protecting sensitive electrical and electronic circuits from damage.

With a compact profile measuring 14 mm in length, 3 mm in width, and 19.3 mm in height, the RUEF400 is suitable for PCB mounting in constrained spaces. The fuse holds a current of 4 A and trips at 8 A within a time frame of 12.7 seconds, balancing safety and performance.

Operating reliably between temperatures of -40°C and 60°C, this device dissipates power up to 2.5 W, ensuring thermal stability during operation. It meets rigorous international standards including UL, CSA, RoHS, TUV, and CQC, ensuring compliance and reliability across industrial environments.

Main applications for the Littelfuse RUEF400 include security systems, power supplies and transformers, power switching devices, automotive and medical equipment, instrumentation, control systems, computers, peripherals, audio visual, and telecommunications equipment.

Automatically resets itself multiple times, reducing maintenance needs. Designed for protection against overcurrent and short circuit conditions. Compact size suitable for PCB wire-ended installations. Wide operating temperature range for harsh environments.

Complies with multiple international safety and quality standards. Effective power dissipation of 2.5 watts. Suitable for a broad range of industrial and commercial electronic applications. Explore Littelfuse series fuses in the Electronics & Electricals category at EnvMart for quality circuit protection solutions.