3AP 10 Glass Cartridge Fuse - Equivalent & Substitute Parts

Part Overview

The Bel Fuse Inc. 3AP 10 is a 10 A, 250 V AC/DC fast-blow glass cartridge fuse in 3AB/3AG package format (1/4" x 1-1/4" axial). This component is classified as obsolete, making equivalent substitute parts necessary for ongoing system maintenance and new designs. The 3AP series has been superseded by active production alternatives that maintain electrical and mechanical compatibility while offering improved availability and RoHS compliance.

Substiute Parts

3AP 10

Bel Fuse Inc.In Stock: 8163AP 10 Datasheet

Current PartRFQ

0318010.HXP

Littelfuse Inc.In Stock: 115720318010.HXP Datasheet

DirectRFQ

0318010.MXP

Littelfuse Inc.In Stock: 12360318010.MXP Datasheet

DirectRFQ

0318010.VXP

Littelfuse Inc.In Stock: 9420318010.VXP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 3AP 10 is determined by strict equivalence across the following critical parameters:

• Current Rating: 10 A (exact match required)
• Voltage Rating: 250 V AC (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)
• Breaking Capacity: 200 A (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)

All three Littelfuse 318 series parts (0318010.HXP, 0318010.MXP, 0318010.VXP) meet these criteria and are direct functional equivalents. These parts are manufactured by Littelfuse Inc., carry active product status, and maintain full electrical and mechanical compatibility with the obsolete 3AP 10.

Parameter Comparison

Engineering Selection Recommendations

The Littelfuse 318 series parts (0318010.HXP, 0318010.MXP, 0318010.VXP) are direct substitutes for the obsolete 3AP 10. All three variants maintain active product status and carry ROHS3 compliance, addressing regulatory requirements that the original part does not meet. All substitute parts hold identical electrical ratings and mechanical dimensions within tolerance, with approval certifications that include CE, CSA, KC, PSE, and UL.

The minor variation in melting I²t (298 versus 316) and DC cold resistance (0.0093 versus 0.009 Ohms) falls within the tolerance band for fast-blow glass cartridge fuses and does not affect functional equivalence in circuit protection applications.

Selection among the three Littelfuse variants (0318010.HXP, 0318010.MXP, 0318010.VXP) is based on packaging availability and inventory requirements, as all three are electrically and mechanically identical.

Frequently Asked Questions (FAQ)

Q: Can the Littelfuse 318 series parts directly replace the Bel Fuse 3AP 10?

A: Yes. The 0318010.HXP, 0318010.MXP, and 0318010.VXP are direct functional equivalents. All maintain the same current rating (10 A), voltage rating (250 V AC), fuse type (cartridge, glass), response time (fast blow), package format (3AB/3AG, 1/4" x 1-1/4"), breaking capacity (200 A), and operating temperature range (-55°C ~ 125°C).

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

A: The 0318010.HXP, 0318010.MXP, and 0318010.VXP are electrically and mechanically identical. The designations reflect different packaging or distribution channels. Selection should be based on inventory availability and procurement requirements.

Q: Are there any compliance differences between the original and substitute parts?

A: Yes. The original 3AP 10 is RoHS non-compliant, while all three Littelfuse substitutes (0318010.HXP, 0318010.MXP, 0318010.VXP) are ROHS3 compliant. The substitute parts also carry additional approval certifications (KC) beyond the original part.

Q: Will the physical dimensions affect installation?

A: The substitute parts have dimensions of 0.275" Dia x 1.288" L compared to the original 0.272" Dia x 1.280" L. These variations are within standard mechanical tolerance for 3AB/3AG cartridge fuses and do not affect installation in standard fuse holders.

Q: Can I use these substitutes in new designs?

A: Yes. The Littelfuse 318 series parts carry active product status and full regulatory approvals (CE, CSA, KC, PSE, UL), making them suitable for new designs and long-term supply continuity.