Equivalent & Substitute Parts for 3SB 1.6

Part Overview

The 3SB 1.6 is a 1.6 A, 250 V AC/DC slow-blow glass cartridge fuse manufactured by Bel Fuse Inc. in the 3AB/3AG package format (1/4" x 1-1/4"). The main part number 3SB 1.6 is classified as obsolete, necessitating identification of active equivalent and substitute components for ongoing applications. Direct manufacturer alternatives and parametric equivalents from other manufacturers are available to maintain circuit protection functionality in existing designs.

Substiute Parts

3SB 1.6

Bel Fuse Inc.In Stock: 8113SB 1.6 Datasheet

Current PartRFQ

3SB 1.6-R

Bel Fuse Inc.In Stock: 121303SB 1.6-R Datasheet

DirectRFQ

031301.6HXP

Littelfuse Inc.In Stock: 866031301.6HXP Datasheet

DirectRFQ

031301.6MXP

Littelfuse Inc.In Stock: 1782031301.6MXP Datasheet

DirectRFQ

031301.6VXP

Littelfuse Inc.In Stock: 816031301.6VXP Datasheet

DirectRFQ

TSA-1.6A

OptiFuseIn Stock: 3609TSA-1.6A Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 3SB 1.6 is determined by strict alignment of the following parameters:

• Current Rating: 1.6 A (exact match required)
• Voltage Rating (AC): 250 V (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Response Time: Slow Blow (exact match required)
• Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (exact match required)
• Mounting Type: Requires Holder (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)

All substitute parts listed below meet these mandatory criteria. Variations in secondary parameters such as breaking capacity, melting I²t, DC cold resistance, and RoHS compliance status do not preclude substitution when primary electrical and mechanical parameters are identical.

Parameter Comparison

Engineering Selection Recommendations

Direct Manufacturer Replacement (Bel Fuse Inc.)

The 3SB 1.6-R is the direct active equivalent from the original manufacturer. This part maintains identical electrical and mechanical specifications while offering improved breaking capacity (200 A vs. 100 A) and ROHS3 compliance. Selection of 3SB 1.6-R eliminates supply chain complexity and ensures design continuity.

Littelfuse Inc. Alternatives

The 031301.6HXP, 031301.6MXP, and 031301.6VXP are active Littelfuse equivalents meeting all primary substitution criteria. All three parts are ROHS3 compliant and carry CE, CSA, PSE, and UL certifications. Dimensional variation is minimal (31.75 mm vs. 31.80 mm length), remaining within standard holder tolerances. These parts are suitable for direct substitution in applications where multi-source qualification is acceptable.

OptiFuse Alternative

The TSA-1.6A from OptiFuse meets all mandatory electrical and mechanical parameters. This part carries cULus and UL 248 certifications and is ROHS3 compliant. Selection of TSA-1.6A is appropriate for applications requiring alternative manufacturer sourcing.

Compliance Considerations

All active substitute parts are ROHS3 compliant, addressing regulatory requirements that may not apply to the obsolete 3SB 1.6 (RoHS non-compliant). Approval agencies vary slightly across manufacturers; verify that required certifications (CE, CSA, UL, PSE) align with application requirements before final selection.

Frequently Asked Questions (FAQ)

Q: Can I use 3SB 1.6-R as a direct replacement for 3SB 1.6?

A: Yes. The 3SB 1.6-R is electrically and mechanically identical to 3SB 1.6 across all primary parameters: 1.6 A current rating, 250 V AC voltage rating, slow-blow response, and 3AB/3AG package format. The 3SB 1.6-R is the active equivalent from Bel Fuse Inc.

Q: What is the difference between Littelfuse 031301.6HXP, 031301.6MXP, and 031301.6VXP?

A: All three Littelfuse parts are electrically and mechanically equivalent. They share identical current rating (1.6 A), voltage rating (250 V), response time (slow blow), and package format (3AB, 3AG). Differences in part number designation reflect internal Littelfuse product line variations but do not affect substitution compatibility.

Q: Are there dimensional differences between substitute parts?

A: Minor dimensional variation exists. The main part 3SB 1.6 and TSA-1.6A measure 31.80 mm in length, while Littelfuse parts (031301.6HXP, 031301.6MXP, 031301.6VXP) measure 31.75 mm. This 0.05 mm difference remains within standard holder tolerances and does not affect mechanical fit or electrical performance.

Q: Do all substitute parts have the same breaking capacity?

A: No. The 3SB 1.6-R has a breaking capacity of 200 A, while all other substitutes (031301.6HXP, 031301.6MXP, 031301.6VXP, TSA-1.6A) have a breaking capacity of 100 A, matching the original 3SB 1.6. Breaking capacity does not affect substitution eligibility when primary electrical parameters are identical.

Q: Which substitute part offers the best RoHS compliance?

A: All active substitute parts are ROHS3 compliant. The original 3SB 1.6 is RoHS non-compliant. If RoHS compliance is a design requirement, any of the listed active substitutes (3SB 1.6-R, 031301.6HXP, 031301.6MXP, 031301.6VXP, TSA-1.6A) satisfy this criterion.

Q: Can I mix different substitute parts in the same application?

A: Yes. All listed substitutes meet identical electrical and mechanical specifications for the 3AB/3AG holder. Mixing different manufacturers or part numbers in the same circuit is permissible from a technical standpoint, though single-source qualification may be preferred for manufacturing consistency.

Q: What certifications should I verify before selecting a substitute?

A: Verify that the selected substitute carries the certifications required by your application. The 3SB 1.6 carries CE, CSA, PSE, and UL certifications. The 3SB 1.6-R carries CE, CSA, cULus, and PSE. Littelfuse parts carry CE, CSA, PSE, and UL. OptiFuse TSA-1.6A carries cULus and UL 248. Confirm alignment with your design requirements.