RUE700 Polymeric PTC Resettable Fuse Equivalent & Substitute Parts

Part Overview

The RUE700 is a polymeric PTC resettable fuse manufactured by Littelfuse Inc., rated for 30V maximum voltage and 7A hold current. This component is classified as obsolete, necessitating identification of active equivalent parts for new designs and ongoing production requirements. The RUE700 operates as a through-hole radial disc fuse, providing overcurrent protection with automatic reset capability across industrial and consumer applications requiring 30V/7A protection parameters.

Substiute Parts

RUE700

Littelfuse Inc.In Stock: 875RUE700 Datasheet

Current PartRFQ

RUEF700

LittelfuseIn Stock: 2010RUEF700 Datasheet

DirectRFQ

0ZRB0700FF1A

Bel Fuse Inc.In Stock: 17020ZRB0700FF1A Datasheet

DirectRFQ

FRU700-30F

RFE/FuzetecIn Stock: 1297FRU700-30F Datasheet

DirectRFQ

MF-R700

Bourns Inc.In Stock: 2408MF-R700 Datasheet

DirectRFQ

PTR030V0700-BK

Eaton - Electronics DivisionIn Stock: 671PTR030V0700-BK Datasheet

DirectRFQ

RS30-700

OptiFuseIn Stock: 2810RS30-700 Datasheet

DirectRFQ

PFRA.700

SCHURTER Inc.In Stock: 783PFRA.700 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RUE700 is determined by strict electrical and mechanical parameter matching:

Critical Electrical Parameters:

• Voltage - Max: 30V (exact match required)
• Current - Hold (Ih) (Max): 7A (exact match required)
• Current - Trip (It): 14A (exact match required)
• Time to Trip: 17.5s (exact match required)
• Resistance - Initial (Ri) (Min): 5 mOhms (exact match required)
• Resistance - Post Trip (R1) (Max): 30 mOhms (exact match required)
• Operating Temperature: -40°C ~ 85°C (exact match required)

Critical Mechanical Parameters:

• Mounting Type: Through Hole (exact match required)
• Package / Case: Radial, Disc (exact match required)
• Type: Polymeric (exact match required)

All identified substitute parts meet these core electrical and mechanical criteria. Variations in Current - Max rating (40A vs. 100A) and physical dimensions (length and height) do not affect functional substitution when core protection parameters are identical.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts listed above satisfy the core electrical and mechanical requirements for direct replacement of the RUE700. Selection among active alternatives should be based on the following criteria:

Product Status & Compliance: All substitute parts are classified as active products with current manufacturing support. The RUE700 is obsolete and no longer in production. For new designs and ongoing production, selection from active alternatives ensures long-term supply chain stability and compliance with current regulatory standards.

RoHS Compliance: Seven of eight substitute parts (RUEF700, 0ZRB0700FF1A, FRU700-30F, MF-R700, RS30-700, PFRA.700) are ROHS3 compliant. PTR030V0700-BK is RoHS compliant. The original RUE700 is RoHS non-compliant. For applications subject to RoHS regulations, any of the listed substitutes provide compliant alternatives.

Certification & Approval Agencies: All substitute parts carry industry-recognized certifications (CSA, TUV, UL, cURus, cUL). The RUE700 carries CSA, TUV, and UR approvals. Substitute parts maintain or exceed the approval agency coverage of the original part.

Inventory Availability: Current stock levels range from 658 to 2768 units across substitute parts, providing multiple sourcing options for production requirements.

Frequently Asked Questions (FAQ)

Q: Can RUEF700 directly replace RUE700 in existing designs? A: Yes. RUEF700 meets all critical electrical parameters (30V, 7A hold current, 14A trip current, 17.5s trip time, 5 mOhms initial resistance, 30 mOhms post-trip resistance) and mechanical specifications (through-hole radial disc package). RUEF700 is the direct Littelfuse successor to the obsolete RUE700, with improved RoHS3 compliance and higher current-max rating (100A vs. 40A).

Q: What is the difference between parts with 40A and 100A maximum current ratings? A: The maximum current rating indicates the absolute maximum current the fuse can handle before permanent damage occurs. Both 40A and 100A variants maintain identical hold current (7A), trip current (14A), and trip time (17.5s) specifications. The higher 100A rating in RUEF700, FRU700-30F, PTR030V0700-BK, and RS30-700 provides additional safety margin without affecting protection characteristics at the 7A hold current level.

Q: Are there physical dimension differences between substitute parts? A: Minor variations exist in length and height. RUE700, 0ZRB0700FF1A, FRU700-30F, PTR030V0700-BK, and RS30-700 measure 0.752" L x 0.118" W with 1.051" seated height. RUEF700 measures 0.752" L x 0.118" W with 1.020" seated height. MF-R700 and PFRA.700 measure 0.870" L x 0.118" W with 1.173" seated height. Lead spacing varies between 0.394" and 0.402". Verify PCB layout compatibility before selection.

Q: Which substitute part offers the best RoHS compliance? A: RUEF700, 0ZRB0700FF1A, FRU700-30F, MF-R700, RS30-700, and PFRA.700 are all ROHS3 compliant. PTR030V0700-BK is RoHS compliant. All seven options exceed the RoHS non-compliant status of the original RUE700.

Q: What certifications do substitute parts carry? A: All substitute parts carry TUV certification. RUEF700 adds CQC and UL approvals. 0ZRB0700FF1A carries cURus certification. FRU700-30F carries cUL and UL approvals. MF-R700 and PFRA.700 carry cURus certification. PTR030V0700-BK carries cURus certification. RS30-700 carries cULus certification. Selection based on required approval agencies for target markets is supported across all alternatives.

Q: Can I use these parts interchangeably in production? A: Yes, all listed substitute parts are electrically and mechanically interchangeable for the RUE700 based on core protection parameters. Verify lead spacing and physical dimensions against your PCB layout before implementation. All parts maintain identical protection characteristics at the 7A hold current specification.