Equivalent & Substitute Parts for 3AP 100-R Glass Cartridge Fuse

Part Overview

The 3AP 100-R is a 100 mA, 250 V AC/DC fast-blow glass cartridge fuse manufactured by Bel Fuse Inc. in the 3AB/3AG package format (1/4" x 1-1/4" axial). This component is classified as obsolete, making identification of active equivalent parts essential for ongoing system maintenance and new design implementations. Substitute parts must maintain identical electrical ratings, mechanical dimensions, and approval certifications to ensure direct interchangeability in existing circuit protection applications.

Substiute Parts

3AP 100-R

Bel Fuse Inc.In Stock: 9743AP 100-R Datasheet

Current PartRFQ

0318.100HXP

Littelfuse Inc.In Stock: 9660318.100HXP Datasheet

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0318.100MXP

Littelfuse Inc.In Stock: 10980318.100MXP Datasheet

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0318.100VXP

Littelfuse Inc.In Stock: 10020318.100VXP Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 3AP 100-R is determined by strict equivalence across the following parameters:

• Current Rating: 100 mA (exact match required)
• Voltage Rating: 250 V AC (exact match required)
• Response Time: Fast Blow (exact match required)
• Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (Axial) (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Mounting Type: Through Hole (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)
• RoHS Compliance: ROHS3 Compliant (exact match required)

All three Littelfuse 318 series parts (0318.100HXP, 0318.100MXP, 0318.100VXP) meet these substitution criteria. These parts are active products with current manufacturing status, providing reliable alternatives to the obsolete 3AP 100-R.

Parameter Comparison

Engineering Selection Recommendations

The 3AP 100-R is obsolete and no longer manufactured. Direct replacement with active Littelfuse 318 series equivalents is necessary for system continuity. All three substitute parts (0318.100HXP, 0318.100MXP, 0318.100VXP) are functionally identical and carry equivalent regulatory approvals (CE, CSA, UL). Selection among these three substitutes may be based on packaging availability and inventory status. The Littelfuse parts maintain ROHS3 compliance and operate within the same temperature range as the original component.

Frequently Asked Questions (FAQ)

Q: Can the Littelfuse 318 series parts directly replace the 3AP 100-R?

A: Yes. The 0318.100HXP, 0318.100MXP, and 0318.100VXP all meet the substitution criteria: identical current rating (100 mA), voltage rating (250 V AC), response time (Fast Blow), package format (3AB/3AG, 1/4" x 1-1/4"), and operating temperature range (-55°C ~ 125°C).

Q: Are there differences in breaking capacity between the main part and substitutes?

A: Yes. The 3AP 100-R has a breaking capacity of 200A at rated voltage, while the Littelfuse substitutes have a breaking capacity of 35A. This difference must be evaluated against circuit protection requirements in the specific application.

Q: Do the substitute parts have the same physical dimensions?

A: The substitute parts have slightly larger dimensions (0.275" Dia x 1.288" L versus 0.272" Dia x 1.280" L for the original). These dimensional variations remain within standard 3AB/3AG package tolerances and do not affect mechanical interchangeability in standard fuse holders.

Q: What are the differences in DC cold resistance?

A: The 3AP 100-R has a DC cold resistance of 12.5 Ohms, while the Littelfuse substitutes measure 11.28 Ohms. This difference is within acceptable tolerance for circuit protection applications.

Q: Are all three Littelfuse parts interchangeable with each other?

A: Yes. The 0318.100HXP, 0318.100MXP, and 0318.100VXP are electrically and mechanically identical. Selection may be based on packaging format (all listed as Bulk) and inventory availability.

Q: What regulatory approvals apply to the substitute parts?

A: The Littelfuse substitutes carry CE, CSA, and UL approvals. The original 3AP 100-R carried CE, CSA, and cULus approvals. Both certification sets are recognized for circuit protection applications in their respective markets.