Littelfuse 031502.5MXP Equivalent & Substitute Parts

Part Overview

The Littelfuse 031502.5MXP is a 2.5 A, 250 V AC/DC slow-blow glass cartridge fuse with 3AB/3AG package configuration and 1/4" x 1-1/4" axial dimensions. This through-hole fuse is designed for circuit protection applications requiring moderate current ratings and slow-blow response characteristics. The part is currently active in production. Substitute parts may be required due to supply constraints, inventory availability, or specific application requirements where equivalent electrical and mechanical parameters are maintained.

Substiute Parts

031502.5MXP

Littelfuse Inc.In Stock: 939031502.5MXP Datasheet

Current PartRFQ

3SBP 2.5-R

Bel Fuse Inc.In Stock: 20103SBP 2.5-R Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Littelfuse 031502.5MXP is determined by the following critical parameters:

• Current Rating: Must be 2.5 A
• Voltage Rating (AC): Must be 250 V
• Fuse Type: Must be Cartridge, Glass
• Response Time: Must be Slow Blow
• Package / Case: Must be 3AB, 3AG, 1/4" x 1-1/4" (Axial)
• Mounting Type: Must be Through Hole
• Operating Temperature Range: Must support -55°C ~ 125°C

The Bel Fuse Inc. 3SBP 2.5-R meets all critical electrical and mechanical parameters required for direct substitution. Both parts share identical current, voltage, fuse type, response time, package configuration, and mounting characteristics. Dimensional tolerances and operating temperature ranges are compatible within engineering specifications.

Parameter Comparison

Engineering Selection Recommendations

The Bel Fuse Inc. 3SBP 2.5-R is a qualified substitute for the Littelfuse 031502.5MXP based on electrical and mechanical equivalence. Both parts are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements.

The Littelfuse 031502.5MXP maintains active product status with current manufacturing support. The Bel Fuse 3SBP 2.5-R is listed as obsolete; however, it remains electrically and mechanically compatible for applications where inventory availability or supply chain considerations necessitate substitution.

Both parts carry equivalent international approvals (CE, CSA, PSE) and support the same operating temperature range. Dimensional variations between the two parts are within acceptable tolerances for standard 3AB/3AG fuse holder applications.

Frequently Asked Questions (FAQ)

Q: Can the Bel Fuse 3SBP 2.5-R be used as a direct replacement for the Littelfuse 031502.5MXP?

A: Yes. Both parts share identical current ratings (2.5 A), voltage ratings (250 V AC), fuse type (Cartridge, Glass), response time (Slow Blow), and package configuration (3AB, 3AG, 1/4" x 1-1/4" Axial). Dimensional and resistance specifications are within compatible tolerances.

Q: What is the difference in breaking capacity between these two parts?

A: The Littelfuse 031502.5MXP has a breaking capacity of 100 A at rated voltage, while the Bel Fuse 3SBP 2.5-R has a breaking capacity of 200 A. Both exceed standard circuit protection requirements for 2.5 A applications.

Q: Are there any compliance or certification differences?

A: Both parts are ROHS3 compliant and REACH unaffected. The Littelfuse part carries CE, CSA, K-MARK, PSE, and UL approvals. The Bel Fuse part carries CE, CSA, cULus, and PSE approvals. Both meet standard international safety certifications for fuse applications.

Q: What is the product status difference, and does it affect substitution?

A: The Littelfuse 031502.5MXP is active in production, while the Bel Fuse 3SBP 2.5-R is obsolete. Obsolete status indicates discontinued manufacturing; however, the part remains electrically and mechanically equivalent for substitution purposes where inventory is available.

Q: Are the physical dimensions identical?

A: Dimensions are nearly identical with minor tolerances. Littelfuse specifies 0.275" Dia x 1.275" L (6.99mm x 32.39mm), while Bel Fuse specifies 0.272" Dia x 1.280" L (6.90mm x 32.50mm). Both fit standard 3AB/3AG fuse holders without modification.