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RUEF300 PTC resettable fuse from Littelfuse, rated for 30V maximum voltage and 3A hold current. Features a radial disc package with 5.05mm lead spacing.
Mfr Part #:

RUEF300

Available from 2 distributors
Mfr Name: Littelfuse Inc.
Littelfuse Inc.
PTC resettable fuse from Littelfuse, rated for 30V maximum voltage and 3A hold current. Features a radial disc package with 5.05mm lead spacing.
✓ Total Stock: 6,026 pcs
$ Price Range: $0.23 - $0.52

RUEF300 Available from 2 distributors

✓ Authorised
✓ Non-Authorised
Distributor Stock Pricing MOQ PKG Lead Time Date Code On Order Quantity On Order Delivery
Risen Electronics ✓
Non-Authorised Inventory information
6,000 pcs
On Request
6000 pcs On Request 1 On Request On Request On Request On Request 2026-02-16 21:33:16
Bristol Electronics ✓
Non-Authorised Inventory information
26 pcs
On Request
26 pcs On Request 1 On Request On Request On Request On Request On Request
DistyParts aggregates offers from multiple distributors. Final prices, lead times and terms are subject to the distributors' discretion and may change without prior notice. DistyParts is not liable for any discrepancies.

RUEF300 Specifications Quick View

Most important parameters for selection – full specs in datasheet.
Category
Manufacturer Name
Current
Height
Lead Spacing
Lead Style
Length
Mounting Type
Operating Temperature
Resistance
Tape & Reel
Time to Trip
Type
Voltage
Width
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RUEF300 Description

Short technical summary and product information.

The Littelfuse RUEF300 is a polymeric positive temperature coefficient (PTC) resettable fuse designed for overcurrent protection. It offers a maximum operating voltage of 30V and a hold current of 3A, with a typical initial resistance of 80 mΩ. The device trips within a maximum of 10.8 seconds under fault conditions.

 

This through-hole component comes in a radial, disc package with a lead spacing of 5.05mm (0.199 inches). The body measures 11.40mm long, 3.00mm wide, and 16.50mm high. It operates over a temperature range of -40°C to 85°C.

 

The RUEF300 is suitable for use in power supplies, battery chargers, motor protection, and general electronics requiring resettable overcurrent limiting. Its polymeric PTC construction provides reliable protection with automatic reset after fault removal.

RUEF300 Quick Information

Product Type: PTC Resettable Fuse
Series: RUEF
Canonical Name: Littelfuse RUEF300 PTC Resettable Fuse
Subcategory: Polymeric Positive Temperature Coefficient PTC

RUEF300 Compliance

RoHS Status: RoHS Compliant
Moisture Sensitivity Level (MSL): 1 Unlimited
REACH Status: REACH Unaffected

RUEF300 Estimated Pricing

Qty Low High
1+ $0.52 $0.52
10+ $0.48 $0.48
50+ $0.40 $0.40
100+ $0.37 $0.37
250+ $0.33 $0.33
500+ $0.30 $0.30
1,000+ $0.28 $0.28
5,000+ $0.23 $0.23

Estimated market price range - modelled values for guidance only, not live distributor offers.

RUEF300 Features

  • Polymeric PTC overcurrent protection device.
  • Rated for 30V maximum operating voltage.
  • 3A hold current with 80 mΩ initial resistance.
  • 10.8s maximum time to trip at fault.
  • Through-hole radial disc package.

RUEF300 Applications

  • Used in power supply overcurrent protection.
  • Ideal for battery charging circuits.
  • Protects motors and transformers from overload.
  • Suitable for general electronics overcurrent limiting.

RUEF300 FAQs

6 frequently asked questions generated from this part’s specifications.
What is the voltage rating of the Littelfuse RUEF300?

The maximum operating voltage is 30V.

What is the hold current of the RUEF300?

The hold current is 3A nominal.

What is the initial resistance of the RUEF300?

The typical initial resistance is 80 mΩ.

What is the time to trip for the RUEF300?

The maximum time to trip is 10.8 seconds at specified fault current.

What is the operating temperature range of the RUEF300?

The operating temperature range is -40°C to 85°C.

What package does the RUEF300 come in?

It is a radial, disc through-hole package with 5.05mm lead spacing.

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