3SB1.5 Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The 3SB1.5 is a 1.5 A, 250 V AC/DC glass cartridge fuse manufactured by Bel Fuse Inc. in the 3SB series. This component is classified as obsolete, which necessitates identification of active equivalent and substitute parts for ongoing design support and procurement. The fuse is designed for use with 3AB and 3AG holders and operates across a temperature range of -55°C to 125°C with slow-blow response characteristics.

Substiute Parts

3SB1.5

Bel Fuse Inc.In Stock: 8953SB1.5 Datasheet

Current PartRFQ

3SB 1.5-R

Bel Fuse Inc.In Stock: 29563SB 1.5-R Datasheet

DirectRFQ

031301.5HXP

Littelfuse Inc.In Stock: 1038031301.5HXP Datasheet

DirectRFQ

031301.5MXP

Littelfuse Inc.In Stock: 4377031301.5MXP Datasheet

DirectRFQ

031301.5VXP

Littelfuse Inc.In Stock: 1150031301.5VXP Datasheet

DirectRFQ

031301.5HXIDP

Littelfuse Inc.In Stock: 846031301.5HXIDP Datasheet

SimilarRFQ

031301.5VXIDP

Littelfuse Inc.In Stock: 835031301.5VXIDP Datasheet

SimilarRFQ

0034.5228

SCHURTER Inc.In Stock: 9500034.5228 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 3SB1.5 is determined by strict equivalence across the following parameters:

• Current Rating: 1.5 A (exact match required)
• Voltage Rating: 250 V AC (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)
• Size / Dimension: 0.250" Dia x 1.250" L (exact match required)
• Mounting Type: Requires Holder (exact match required)

All identified substitute parts meet these criteria. Substitute parts are categorized as Direct Manufacturer equivalents (same manufacturer, active status), Direct Manufacturer equivalents from alternative manufacturers (active status), Similar equivalents (active status with minor specification variations), and Parametric equivalents (obsolete status, parametric match only).

Parameter Comparison

Engineering Selection Recommendations

For new designs and ongoing procurement, active-status parts are preferred over obsolete alternatives. The 3SB 1.5-R from Bel Fuse Inc. is the direct active equivalent from the original manufacturer and provides the highest compatibility assurance. This part maintains the same electrical specifications while offering improved breaking capacity (200 A versus 100 A) and RoHS3 compliance.

Littelfuse Inc. parts (031301.5HXP, 031301.5MXP, 031301.5VXP, 031301.5HXIDP, 031301.5VXIDP) are all active-status alternatives that meet the core electrical and mechanical parameters. These parts are RoHS3 compliant and carry equivalent approval certifications (CE, CSA, PSE, UL).

The SCHURTER part 0034.5228 is a parametric equivalent but carries obsolete status, making it unsuitable for new procurement strategies.

Frequently Asked Questions (FAQ)

Q: Can I use 3SB 1.5-R as a direct replacement for 3SB1.5?

A: Yes. The 3SB 1.5-R meets all core electrical and mechanical parameters: 1.5 A current rating, 250 V AC voltage rating, slow-blow response, and 3AB/3AG package compatibility. The 3SB 1.5-R is active-status and RoHS3 compliant, making it the preferred direct replacement from the original manufacturer.

Q: What is the difference between Littelfuse 031301.5VXP and 031301.5VXIDP?

A: Both parts are electrically and mechanically equivalent with identical current rating, voltage rating, response time, and package specifications. The designation difference reflects internal product line categorization by Littelfuse Inc. Both are active-status and RoHS3 compliant.

Q: Are there any dimensional differences between substitute parts?

A: The 3SB 1.5-R has a length of 0.250" Dia x 1.252" L (6.35mm x 31.80mm), which is 0.002" longer than the original 3SB1.5 and other substitutes. This minor variation remains within standard tolerance for 3AB/3AG holder compatibility.

Q: Why is the 0034.5228 listed if it is obsolete?

A: The 0034.5228 is included as a parametric equivalent for reference purposes only. It meets all core electrical and mechanical specifications but carries obsolete status. For new designs and procurement, active-status alternatives are recommended.

Q: Do all substitute parts have the same approval certifications?

A: The original 3SB1.5 carries CE, CSA, PSE, and UL certifications. The 3SB 1.5-R carries CE, CSA, cULus, and PSE certifications. Littelfuse parts carry CE, CSA, PSE, and UL certifications. SCHURTER 0034.5228 carries CSA and UL certifications. Verify specific certification requirements for your application.