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Littelfuse RUEF300 PolySwitch Resettable Device

The RUEF300 from TE Connectivity is a radial leaded PolySwitch resettable device designed for overcurrent protection. It features a fast trip time, low resistance, and a hold current of 3A at room temperature, with a maximum voltage rating of 30V and maximum current of 100A. The device trips at approximately 6A under room temperature conditions and has a maximum resistance of 0.08 ohms at 20°C one hour post-trip. It operates within a temperature range of -40°C to 85°C and is made with UL94 V-0 flame retardant epoxy polymer insulation. Suitable for safety, industrial, and portable device applications, it provides enhanced design flexibility and is compatible with high-volume electronics assembly. Users should note that operation in circuits with large inductance can generate voltages above the rated voltage, and the device is intended for protection against overcurrent or overtemperature faults, not for repeated fault conditions or prolonged trips.

Authorized Distributors
Source:Newark
Part No:RUEF300
Stock:5404
Inv Date:05-28-2026
Price: Unit price: $0.587
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Source:DigiKey
Part No:RUEF300
Stock:12007
Inv Date:05-28-2026
Price: Unit price: $0.62
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Part No:RUEF300
Stock:22535
Inv Date:05-29-2026
Price: Unit price: $0.52
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Part No:RUEF300
Stock:0
Inv Date:05-28-2026
Price: Unit price: $0.25
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Part No:RUEF300
Stock:0
Inv Date:05-28-2026
Price: Unit price: $0.33
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Source:Arrow EU
Part No:RUEF300
Stock:2500
Inv Date:05-29-2026
Price: N/A
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Part No:RUEF300
Stock:268
Inv Date:05-29-2026
Price: N/A
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Littelfuse RUEF300 PolySwitch Resettable Device Specifications:

  • Physical Configuration: Radial leaded
  • Voltage Rating: 30V
  • Hold Current: 3A at 25°C
  • Maximum Trip Current: approx. 6A
  • Maximum Resistance: 0.08 ohms at 20°C
  • Operating Temperature Range: -40°C to 85°C
  • Operating Voltage: Up to 30V
  • Flame Retardant Insulation: UL94 V-0 epoxy polymer
  • Agency Recognition: UL, CSA, TUV, CQC
  • Solderability: ANSI/J-STD-002 Category 3
  • Solder Heat Resistance: 10s at 260°C plus/minus 5°C
  • Lead Material: Tin-plated Copper (24AWG)
  • Device Dimensions: Refer to Datasheet Figures (approx. 43mm length, 0.51mm diameter)
  • Compliance: RoHS, ELV, Halogen Free

Buy the Buy TE Connectivity RUEF300 Part Number RUEF300 Online

Order the TE Connectivity RUEF300 radial lead PolySwitch resettable device online today. Designed for overcurrent protection, it features a fast trip time, low resistance, and operates within a temperature range of -40°C to 85°C. With a maximum voltage rating of 30V and a hold current of 3A, it is ideal for safety, industrial, and portable devices. Its flame-retardant epoxy insulation and high-volume electronics compatibility ensure excellent safety and design flexibility. Protect your circuits effectively with this reliable and easy-to-implement overcurrent breaker.

Buy TE Connectivity RUEF300 now and experience reliable overcurrent protection for industrial and portable electronics.

Frequently Asked Questions

Where can I buy Littelfuse RUEF300?

You can click on the BUY or RFQ button to purchase RUEF300 from an authorized Littelfuse distributor.

How do I troubleshoot issues or seek technical support for part RUEF300?

You can download the RUEF300 datasheet or visit the Littelfuse website for support.

Who is the manufacturer of RUEF300?

Littelfuse

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