RXEF050 0.5A Resettable Fuse – PPTC Polyfuse – 72V Radial – Littelfuse

The RXEF050 is a high-reliability PPTC resettable fuse (polyfuse) designed for overcurrent protection in electronic circuits. Manufactured by industry leaders such as Littelfuse and Raychem, this radial-lead PolySwitch device provides automatic reset capability after fault conditions, eliminating the need to replace traditional fuses.

With a hold current of 0.5A and a trip current of 1A, the RXEF050 protects circuits from overloads and short-circuits while maintaining normal operation at safe current levels. Rated for up to 72V DC, it supports applications involving higher voltages while offering a maximum surge withstand of 40A.

Featuring fast trip response (~4 seconds at 1A), low initial resistance, and robust thermal protection, this polyfuse is ideal for power supplies, telecom equipment, consumer electronics, battery protection, and industrial control systems. It meets UL, CSA, and TÜV safety standards and operates within a wide temperature range of –40°C to +85°C.

Key Specifications:

• Manufacturer: Littelfuse / Raychem

• Part Number: RXEF050

• Type: PPTC Resettable Fuse (Polyfuse)

• Mounting Style: Radial, through-hole

• Hold Current (Ihold): 0.5A

• Trip Current (Itrip): 1A

• Maximum Current (Imax): 40A

• Maximum Voltage: 72V DC

• Time to Trip: ~4 seconds @ 1A

• Initial Resistance: 0.5Ω

• Post-Trip Resistance: 1.17Ω max

• Operating Temperature: –40°C to +85°C

• Safety Approvals: UL, CSA, TÜV

Package Includes:
1 x RXEF050 0.5A Resettable PPTC Polyfuse

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