Equivalent & Substitute Parts for RUE110

Part Overview

The RUE110 is a polymeric PTC resettable fuse manufactured by Littelfuse, rated for 30V maximum voltage with a 1.1A hold current. This component is classified as obsolete, which necessitates identification of active equivalent and substitute parts for ongoing design support and procurement. The RUE110 belongs to the PolySwitch® series and is designed for through-hole radial mounting in disc configuration.

Substiute Parts

RUE110

LittelfuseIn Stock: 797RUE110 Datasheet

Current PartRFQ

RUEF110

LittelfuseIn Stock: 3387RUEF110 Datasheet

DirectRFQ

30R110UU

Littelfuse Inc.In Stock: 217830R110UU Datasheet

Parametric EquivalentRFQ

FRU110-30F

RFE/FuzetecIn Stock: 1398FRU110-30F Datasheet

DirectRFQ

MF-R110

Bourns Inc.In Stock: 4323MF-R110 Datasheet

DirectRFQ

PTR030V0110-BK

Eaton - Electronics DivisionIn Stock: 1712PTR030V0110-BK Datasheet

DirectRFQ

PTR030V0110-BK1

Eaton - Electronics DivisionIn Stock: 766PTR030V0110-BK1 Datasheet

DirectRFQ

RS30-110

OptiFuseIn Stock: 4086RS30-110 Datasheet

DirectRFQ

PFRA.110

SCHURTER Inc.In Stock: 1038PFRA.110 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RUE110 is determined by the following critical parameters:

• Voltage - Max: 30V (exact match required)
• Current - Hold (Ih) (Max): 1.1 A (exact match required)
• Current - Trip (It): 2.2 A (exact match required)
• Time to Trip: 6.6 s (exact match required)
• Operating Temperature Range: -40°C ~ 85°C (exact match required)
• Mounting Type: Through Hole (exact match required)
• Package / Case: Radial, Disc (exact match required)

Substitute parts are grouped into two categories:

Direct Equivalents: Parts with identical electrical characteristics and mechanical form factors, differing only in manufacturer, series designation, or packaging format.

Parametric Equivalents: Parts meeting all critical electrical and thermal specifications with minor variations in physical dimensions or resistance characteristics that remain within acceptable operational parameters.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

RUEF110 (Littelfuse), 30R110UU (Littelfuse), FRU110-30F (RFE/Fuzetec), and RS30-110 (OptiFuse) are direct electrical equivalents with identical hold current, trip current, and time-to-trip specifications. These parts maintain the 50 mOhms initial resistance and 170 mOhms post-trip resistance of the original RUE110. All are active products with ROHS3 compliance or RoHS compliance status, providing regulatory advantage over the obsolete RUE110.

Secondary Substitutes (Parametric Equivalents):

PTR030V0110-BK and PTR030V0110-BK1 (Eaton) meet all critical electrical specifications with lead spacing of 0.197" (5.00mm) versus the RUE110's 0.201" (5.10mm). This minor lead spacing variation remains within acceptable mechanical tolerance for through-hole radial mounting. Both parts are RoHS compliant and active.

Alternative Substitutes (Higher Resistance Characteristics):

MF-R110 (Bourns) and PFRA.110 (SCHURTER) maintain identical voltage, current, and thermal specifications but feature higher initial resistance (100 mOhms) and post-trip resistance (270 mOhms) compared to the RUE110. These parts are suitable for applications where elevated resistance characteristics are acceptable. Both are ROHS3 compliant and active products.

Frequently Asked Questions (FAQ)

Q: Can RUEF110 be used as a direct replacement for RUE110?

A: Yes. RUEF110 is manufactured by Littelfuse and meets all critical electrical parameters: 30V maximum voltage, 1.1A hold current, 2.2A trip current, and 6.6s time-to-trip. The primary difference is ROHS3 compliance status and slightly higher initial resistance (70 mOhms versus 50 mOhms), which does not affect functional compatibility.

Q: What is the difference between 30R110UU and RUE110?

A: 30R110UU is the active equivalent from Littelfuse's POLY-FUSE® series. Electrical specifications are identical to RUE110. The part is ROHS3 compliant and currently in active production, whereas RUE110 is obsolete.

Q: Are PTR030V0110-BK and PTR030V0110-BK1 interchangeable?

A: Both Eaton parts meet identical electrical specifications and are mechanically compatible. PTR030V0110-BK1 is listed as a variant designation. Lead spacing is 0.197" (5.00mm) for both, which is within acceptable tolerance for through-hole radial mounting applications designed for the RUE110.

Q: Why do MF-R110 and PFRA.110 have higher resistance values?

A: MF-R110 (Bourns Multifuse®) and PFRA.110 (SCHURTER) are parametric equivalents with identical voltage and current ratings but different resistance characteristics. Initial resistance is 100 mOhms and post-trip resistance is 270 mOhms. These parts are suitable for applications where higher resistance is acceptable or beneficial.

Q: Which substitute offers the best regulatory compliance?

A: RUEF110, 30R110UU, FRU110-30F, RS30-110, MF-R110, and PFRA.110 all carry ROHS3 compliance or RoHS compliance status. PTR030V0110-BK and PTR030V0110-BK1 carry RoHS compliance. All active substitutes provide regulatory advantage over the obsolete, non-compliant RUE110.

Q: Is lead spacing critical for PCB compatibility?

A: Lead spacing variations are minor across all substitutes. RUE110 specifies 0.201" (5.10mm), while PTR030V0110-BK and PTR030V0110-BK1 specify 0.197" (5.00mm). These differences remain within standard through-hole radial mounting tolerances and do not prevent board-level compatibility.