3AP 1-R Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The 3AP 1-R is a 1 A, 250 V AC/DC fast-blow glass cartridge fuse manufactured by Bel Fuse Inc. in the 3AB/3AG form factor (1/4" x 1-1/4" axial). This component is classified as obsolete, making equivalent substitute parts necessary for ongoing system maintenance and new design implementations. Littelfuse Inc. produces functionally equivalent alternatives within the same series specification.

Substiute Parts

3AP 1-R

Bel Fuse Inc.In Stock: 7483AP 1-R Datasheet

Current PartRFQ

0318001.HXP

Littelfuse Inc.In Stock: 8450318001.HXP Datasheet

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0318001.MXP

Littelfuse Inc.In Stock: 10050318001.MXP Datasheet

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0318001.VXP

Littelfuse Inc.In Stock: 7650318001.VXP Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 3AP 1-R is determined by strict equivalence across the following parameters:

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

All three Littelfuse 318 series parts (0318001.HXP, 0318001.MXP, 0318001.VXP) meet these criteria and are classified as active products with current manufacturing status.

Parameter Comparison

Engineering Selection Recommendations

The 3AP 1-R is obsolete; therefore, substitution with an active product is necessary for new procurements and system maintenance. All three Littelfuse 318 series alternatives (0318001.HXP, 0318001.MXP, 0318001.VXP) are electrically and mechanically equivalent and carry active product status.

The Littelfuse substitutes provide expanded regulatory approvals (KC, PSE, UL in addition to CE, CSA, cULus), ensuring compliance across broader geographic and application requirements. Dimensional tolerances between the original and substitute parts are within acceptable mechanical fit ranges for standard through-hole fuse holders.

Selection among the three Littelfuse alternatives should be based on packaging availability and supply chain requirements, as all three parts are functionally identical.

Frequently Asked Questions (FAQ)

Q: Can 0318001.HXP, 0318001.MXP, and 0318001.VXP be used interchangeably with 3AP 1-R?

A: Yes. All three Littelfuse parts meet the electrical and mechanical specifications required for direct substitution. Current rating, voltage rating, fuse type, response time, package form factor, and operating temperature range are identical across all four parts.

Q: What is the difference between the three Littelfuse substitute parts?

A: From an electrical and mechanical standpoint, 0318001.HXP, 0318001.MXP, and 0318001.VXP are functionally identical. Differences relate to packaging format and internal distribution channels. Selection should be based on availability and procurement requirements.

Q: Are there dimensional differences between 3AP 1-R and the Littelfuse substitutes?

A: Minor dimensional variations exist. The 3AP 1-R measures 0.272" diameter x 1.280" length, while Littelfuse parts measure 0.275" diameter x 1.288" length. These differences fall within standard mechanical tolerances for 3AB/3AG form factor fuse holders and do not affect functional compatibility.

Q: Do the substitute parts carry the same regulatory approvals?

A: The Littelfuse substitutes carry CE, CSA, KC, PSE, and UL approvals, compared to CE, CSA, and cULus for the original 3AP 1-R. The Littelfuse parts provide equivalent or expanded compliance coverage for most applications.

Q: What is the difference in breaking capacity between 3AP 1-R and the Littelfuse substitutes?

A: The 3AP 1-R has a breaking capacity of 200 A at rated voltage, while Littelfuse substitutes have 35 A. For applications requiring the higher breaking capacity specification, this parameter must be evaluated against system requirements.