RUEF700 Polymeric PTC Resettable Fuse Equivalent & Substitute Parts

Part Overview

The RUEF700 is an active polymeric PTC resettable fuse manufactured by Littelfuse, rated for 30V maximum voltage and 7A hold current. This component provides overcurrent protection in through-hole radial disc configuration. Substitute parts are identified based on matching electrical ratings, mechanical compatibility, and thermal characteristics to ensure functional equivalence in circuit protection applications.

Substiute Parts

RUEF700

LittelfuseIn Stock: 2010RUEF700 Datasheet

Current PartRFQ

30R700UMR

Littelfuse Inc.In Stock: 184330R700UMR Datasheet

SimilarRFQ

PTR030V0700-TR

Eaton - Electronics DivisionIn Stock: 1081PTR030V0700-TR Datasheet

DirectRFQ

MF-R700

Bourns Inc.In Stock: 2408MF-R700 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

• Voltage rating: 30V maximum
• Hold current: 7A
• Trip current: 14A
• Time to trip: 17.5 seconds
• Initial resistance: 5 mOhms minimum
• Post-trip resistance: 30 mOhms maximum
• Operating temperature range: -40°C to 85°C
• Mounting configuration: Through hole radial disc

All identified substitute parts match these core electrical and mechanical specifications. Variations in maximum current capacity, physical dimensions, and lead spacing are noted but do not affect functional substitution for the specified protection circuit.

Parameter Comparison

Engineering Selection Recommendations

All four parts are active products with ROHS3 compliance and REACH unaffected status. Selection between RUEF700, 30R700UMR, PTR030V0700-TR, and MF-R700 is determined by packaging requirements and availability:

RUEF700 and PTR030V0700-TR support maximum current ratings of 100A, suitable for applications requiring higher transient current handling. 30R700UMR and MF-R700 are rated for 40A maximum current.

Packaging format considerations: RUEF700 is supplied in bag format; 30R700UMR in cut tape; PTR030V0700-TR in tape and reel; MF-R700 in bulk. Tape and reel packaging is standard for automated assembly processes.

All parts carry TUV certification. RUEF700 and PTR030V0700-TR additionally carry CSA and cURus approvals respectively.

Frequently Asked Questions (FAQ)

Q: Can 30R700UMR replace RUEF700 in all applications?

A: Yes, for circuits where maximum current does not exceed 40A. Both parts share identical hold current (7A), trip current (14A), trip time (17.5s), and resistance specifications. The 30R700UMR maximum current rating of 40A is lower than RUEF700's 100A rating.

Q: What is the difference between PTR030V0700-TR and RUEF700?

A: PTR030V0700-TR is manufactured by Eaton and supplied in tape and reel format, while RUEF700 is Littelfuse in bag format. Electrical specifications are identical. Lead spacing differs slightly: PTR030V0700-TR at 0.394" versus RUEF700 at 0.400".

Q: Is MF-R700 suitable for high-speed automated assembly?

A: MF-R700 is supplied in bulk format, which requires manual handling or custom tape preparation. For automated assembly, PTR030V0700-TR (tape and reel) or 30R700UMR (cut tape) are preferred.

Q: Do all substitute parts meet the same thermal operating range?

A: Yes. All four parts operate across -40°C to 85°C, ensuring thermal compatibility in equivalent circuit applications.

Q: Are there dimensional compatibility concerns when substituting parts?

A: Physical dimensions vary slightly. RUEF700 and PTR030V0700-TR measure 0.752" L x 0.118" W. MF-R700 is 0.870" L x 0.118" W. Height seated ranges from 1.020" to 1.173". Lead spacing ranges from 0.394" to 0.402". Verify PCB layout accommodates the selected part's footprint.