3SB 2 Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The 3SB 2 is a 2 A, 250 V AC/DC glass cartridge fuse manufactured by Bel Fuse Inc. in the 3SB series. This component is classified as obsolete, requiring identification of active equivalent alternatives for continued system support and procurement. The 3AB/3AG package format (1/4" x 1-1/4") with slow-blow response characteristics defines the functional requirements for direct substitution.

Substiute Parts

3SB 2

Bel Fuse Inc.In Stock: 10973SB 2 Datasheet

Current PartRFQ

3SB 2-R

Bel Fuse Inc.In Stock: 129953SB 2-R Datasheet

DirectRFQ

0034.5231

SCHURTER Inc.In Stock: 15430034.5231 Datasheet

DirectRFQ

0313002.MXP

Littelfuse Inc.In Stock: 17850313002.MXP Datasheet

DirectRFQ

0313002.VXP

LittelfuseIn Stock: 8100313002.VXP Datasheet

DirectRFQ

0313002.HXIDP

Littelfuse Inc.In Stock: 11580313002.HXIDP Datasheet

SimilarRFQ

0313002.HXP

Littelfuse Inc.In Stock: 16140313002.HXP Datasheet

SimilarRFQ

0313002.VXIDP

Littelfuse Inc.In Stock: 9250313002.VXIDP Datasheet

SimilarRFQ

TSA-2A

OptiFuseIn Stock: 9861TSA-2A Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following parameters: current rating (2 A), voltage rating (250 V AC), fuse type (cartridge glass), response time (slow blow), package format (3AB/3AG, 1/4" x 1-1/4"), and mounting type (requires holder). All identified substitutes maintain these core electrical and mechanical specifications. Variations in breaking capacity, melting I²t, DC cold resistance, and compliance certifications do not disqualify substitution but are documented for system design consideration.

Parameter Comparison

Engineering Selection Recommendations

For new designs and procurement, 3SB 2-R (Bel Fuse Inc., active status) provides direct manufacturer continuity with enhanced breaking capacity (200A vs. 100A) and RoHS3 compliance. The Littelfuse 313 series variants (0313002.HXP, 0313002.MXP, 0313002.VXP, 0313002.HXIDP, 0313002.VXIDP) are active alternatives with full compliance certifications (CE, CSA, PSE, UL) and identical electrical parameters. TSA-2A (OptiFuse) offers active status with UL 248 certification. Obsolete alternatives (0034.5231, original 3SB 2) should be replaced in active procurement cycles.

Frequently Asked Questions (FAQ)

Q: Can 3SB 2-R directly replace the obsolete 3SB 2? A: Yes. Both parts share identical current rating (2 A), voltage rating (250 V AC), response time (slow blow), and package format (3AB/3AG, 1/4" x 1-1/4"). The 3SB 2-R is the active equivalent from the same manufacturer with improved breaking capacity and RoHS3 compliance.

Q: What is the difference between Littelfuse 313 series variants (HXP, MXP, VXP, HXIDP, VXIDP)? A: All variants maintain identical electrical specifications (2 A, 250 V AC, slow blow) and package format. Variant designations reflect different packaging, certification, or internal design configurations. Selection depends on procurement requirements and system certifications.

Q: Are there dimensional differences between substitute parts? A: Minor dimensional variation exists. The original 3SB 2 and TSA-2A measure 0.250" Dia x 1.252" L (6.35mm x 31.80mm), while SCHURTER 0034.5231 and Littelfuse 313 series measure 0.250" Dia x 1.250" L (6.35mm x 31.75mm). Both dimensions are compatible with 3AB/3AG holders.

Q: Which substitute offers the best compliance for new designs? A: Littelfuse 313 series (0313002.HXP, 0313002.MXP, 0313002.VXP, 0313002.HXIDP, 0313002.VXIDP) and 3SB 2-R all carry RoHS3 compliance and full international certifications (CE, CSA, PSE, UL). Selection should align with specific system certification requirements.

Q: Does breaking capacity affect substitution eligibility? A: Breaking capacity does not disqualify substitution when all core electrical and mechanical parameters match. However, system design must accommodate the specified breaking capacity. The 3SB 2-R (200A) provides higher breaking capacity than alternatives (100A), which may be advantageous in high-fault-current applications.