RUEF110-2 Polymeric PTC Resettable Fuse Equivalent & Substitute Parts

Part Overview

The RUEF110-2 is a polymeric PTC resettable fuse manufactured by Littelfuse, part of the PolySwitch® RUEF series. This component provides overcurrent protection with automatic reset capability in through-hole radial disc configuration. The device is rated for 30V maximum voltage with 1.1A hold current and 2.2A trip current, designed for applications requiring reliable circuit protection with self-recovery characteristics. As an active product with full compliance certifications (CQC, CSA, TUV, UL), substitute parts are identified to support procurement flexibility, inventory management, and supply chain continuity.

Substiute Parts

RUEF110-2

LittelfuseIn Stock: 5214RUEF110-2 Datasheet

Current PartRFQ

RUEF110-AP

LittelfuseIn Stock: 4535RUEF110-AP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RUEF110-2 is determined by strict equivalence across all critical electrical and mechanical parameters. The following parameters define the substitution criteria:

• Voltage rating: 30V maximum
• Hold current (Ih): 1.1A maximum
• Trip current (It): 2.2A
• Initial resistance (Ri): 70 mOhms minimum
• Post-trip resistance (R1): 170 mOhms maximum
• Operating temperature range: -40°C to 85°C
• Mounting configuration: Through hole radial disc
• Physical dimensions: 0.291" diameter × 0.118" thickness (7.40mm × 3.00mm)
• Lead spacing: 0.199" (5.05mm)

Parts meeting these exact specifications within the PolySwitch® RUEF series are classified as parametric equivalents and direct substitutes.

Parameter Comparison

Engineering Selection Recommendations

Both RUEF110-2 and RUEF110-AP are active products with identical electrical specifications, mechanical dimensions, and regulatory certifications. Selection between these parts may be based on inventory availability and packaging format (both supplied in Cut Tape). The RUEF110-2 maintains 5200 pieces in stock, while RUEF110-AP maintains 4452 pieces in stock. Both components carry full compliance with CQC, CSA, TUV, and UL approval agencies, with ROHS3 compliance and REACH unaffected status. For applications requiring polymeric PTC resettable fuse protection at 30V/1.1A with through-hole radial disc mounting, either part number provides equivalent performance and reliability.

Frequently Asked Questions (FAQ)

Q: Can RUEF110-AP be used as a direct replacement for RUEF110-2?

A: Yes. Both parts are parametric equivalents with identical electrical ratings (30V, 1.1A hold, 2.2A trip), resistance characteristics, operating temperature range, and physical dimensions. They share the same series designation, mounting type, and regulatory certifications.

Q: Are there any differences in performance between RUEF110-2 and RUEF110-AP?

A: No. The electrical and mechanical specifications are identical across all measured parameters, including voltage rating, current ratings, resistance values, time to trip, operating temperature, and physical dimensions.

Q: What determines if a part can substitute for RUEF110-2?

A: Substitution requires exact equivalence in voltage rating (30V), hold current (1.1A), trip current (2.2A), initial resistance (70 mOhms minimum), post-trip resistance (170 mOhms maximum), operating temperature range (-40°C to 85°C), through-hole radial disc mounting configuration, and physical dimensions (0.291" diameter × 0.118" thickness with 0.199" lead spacing).

Q: Does packaging format affect substitution eligibility?

A: Both RUEF110-2 and RUEF110-AP are supplied in Cut Tape (CT) packaging. Packaging format is consistent between these parts and does not affect electrical or mechanical compatibility.

Q: Are both parts compliant with industry standards?

A: Yes. Both RUEF110-2 and RUEF110-AP carry identical approvals from CQC, CSA, TUV, and UL, with ROHS3 compliance and REACH unaffected status.