Equivalent & Substitute Parts for 3AP 7-R Glass Cartridge Fuse

Part Overview

The 3AP 7-R is a 7 A 250 V AC/DC glass cartridge fuse manufactured by Bel Fuse Inc., designed for through-hole mounting in 3AB/3AG package format with fast-blow response characteristics. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts to maintain circuit protection functionality in legacy and new designs requiring identical electrical and mechanical specifications.

Substiute Parts

3AP 7-R

Bel Fuse Inc.In Stock: 9753AP 7-R Datasheet

Current PartRFQ

0318007.HXP

Littelfuse Inc.In Stock: 10640318007.HXP Datasheet

DirectRFQ

0318007.MXP

Littelfuse Inc.In Stock: 11390318007.MXP Datasheet

DirectRFQ

0318007.VXP

Littelfuse Inc.In Stock: 6810318007.VXP Datasheet

DirectRFQ

BK/AGC-V-7

Eaton - Electronics DivisionIn Stock: 1275BK/AGC-V-7 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 3AP 7-R is determined by strict equivalence across the following critical parameters:

• Current Rating: 7 A (exact match required)
• Voltage Rating (AC): 250 V (exact match required)
• Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (Axial) (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Response Time: Fast Blow (exact match required)
• Mounting Type: Through Hole (exact match required)
• Breaking Capacity @ Rated Voltage: 200 A (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)

All identified substitute parts meet these criteria. Direct manufacturer equivalents from Littelfuse Inc. (0318007.HXP, 0318007.MXP, 0318007.VXP) are classified as direct substitutes. The Eaton BK/AGC-V-7 is classified as a similar substitute, meeting all electrical and mechanical parameters while maintaining functional compatibility.

Parameter Comparison

Engineering Selection Recommendations

Direct substitutes 0318007.HXP, 0318007.MXP, and 0318007.VXP from Littelfuse Inc. are active products with ROHS3 compliance and broader approval agency certifications (CE, CSA, KC, PSE, UL) compared to the obsolete 3AP 7-R. These parts are functionally equivalent across all critical electrical and mechanical parameters and are recommended as primary alternatives.

The Eaton BK/AGC-V-7 is an active product meeting all electrical and mechanical specifications. However, this part carries RoHS non-compliance status and reduced approval agency coverage (CSA, UL only), limiting its applicability in designs requiring full regulatory compliance.

Selection between Littelfuse direct substitutes should be based on packaging availability and inventory requirements, as all three variants (0318007.HXP, 0318007.MXP, 0318007.VXP) are electrically and mechanically equivalent.

Frequently Asked Questions (FAQ)

Q: Can 0318007.HXP, 0318007.MXP, and 0318007.VXP be used interchangeably with 3AP 7-R?

A: Yes. All three Littelfuse parts are direct substitutes meeting identical current rating (7 A), voltage rating (250 V AC), package format (3AB, 3AG, 1/4" x 1-1/4"), response time (fast blow), and breaking capacity (200 A) specifications. Dimensional and resistance variations are within acceptable tolerance for through-hole cartridge fuse applications.

Q: What is the difference between 0318007.HXP, 0318007.MXP, and 0318007.VXP?

A: These three Littelfuse parts are electrically and mechanically identical. Differences are limited to packaging and inventory designations. Selection should be based on available stock and packaging requirements.

Q: Is BK/AGC-V-7 from Eaton a suitable replacement for 3AP 7-R?

A: BK/AGC-V-7 meets all electrical and mechanical parameters required for functional substitution. However, it is RoHS non-compliant and carries limited approval agency certifications (CSA, UL). Use this part only in applications where RoHS compliance is not required and CSA/UL certifications are sufficient.

Q: What are the key differences in melting I²t values between substitute parts?

A: Melting I²t values vary across substitutes (118 for Littelfuse variants, 195.02 for Eaton). These variations reflect different thermal characteristics but do not affect compatibility in applications designed for 7 A fast-blow response at 250 V AC. All parts meet the 200 A breaking capacity specification.

Q: Are dimensional variations between substitute parts significant?

A: Dimensional variations are minor (within 0.009" diameter and 0.012" length across all parts). All parts conform to 3AB/3AG package specifications and are mechanically compatible with standard through-hole fuse holders designed for this format.

Q: What compliance certifications should I prioritize when selecting a substitute?

A: For new designs, prioritize parts with ROHS3 compliance and broad approval agency coverage. Littelfuse direct substitutes (0318007.HXP, 0318007.MXP, 0318007.VXP) carry CE, CSA, KC, PSE, and UL certifications, meeting requirements for most industrial and consumer applications.