3SB 1 Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The 3SB 1 is a 1 A, 250 V AC/DC slow blow glass cartridge fuse manufactured by Bel Fuse Inc. This component is classified as obsolete, with 985 units currently in stock. The fuse requires a 3AB or 3AG holder and is designed for applications requiring slow blow response characteristics with a 3AB, 3AG form factor (1/4" x 1-1/4").

Due to the obsolete product status, equivalent and substitute parts from active manufacturers are necessary for ongoing system support and new design implementations.

Substiute Parts

3SB 1

Bel Fuse Inc.In Stock: 10173SB 1 Datasheet

Current PartRFQ

3SB 1-R

Bel Fuse Inc.In Stock: 37233SB 1-R Datasheet

DirectRFQ

0313001.HXC932P

Littelfuse Inc.In Stock: 9630313001.HXC932P Datasheet

DirectRFQ

0313001.HXP

Littelfuse Inc.In Stock: 124090313001.HXP Datasheet

DirectRFQ

0313001.MXP

Littelfuse Inc.In Stock: 32780313001.MXP Datasheet

DirectRFQ

0313001.VXP

Littelfuse Inc.In Stock: 10210313001.VXP Datasheet

DirectRFQ

0313001.HXIDP

Littelfuse Inc.In Stock: 12320313001.HXIDP Datasheet

SimilarRFQ

0313001.VXIDP

Littelfuse Inc.In Stock: 9250313001.VXIDP Datasheet

SimilarRFQ

TSA-1A

OptiFuseIn Stock: 4941TSA-1A Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following parameters:

• Current Rating: 1 A (exact match required)
• Voltage Rating (AC): 250 V (exact match required)
• Response Time: Slow Blow (exact match required)
• Fuse Type: Cartridge, Glass (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 criteria and are classified as direct equivalents or parametric equivalents based on their electrical and mechanical compatibility with the 3SB 1.

Parameter Comparison

Engineering Selection Recommendations

All listed substitute parts meet the electrical and mechanical requirements for direct replacement of the 3SB 1. Selection should be based on the following criteria:

Active Product Status: The 3SB 1-R (Bel Fuse Inc.) is the direct successor from the original manufacturer and maintains active product status with ROHS3 compliance.

Littelfuse 313 Series: The 0313001.HXP, 0313001.MXP, 0313001.VXP, 0313001.HXIDP, and 0313001.VXIDP parts represent active alternatives from Littelfuse Inc. with ROHS3 compliance. These parts are functionally equivalent and widely available.

OptiFuse TSA Series: The TSA-1A from OptiFuse is a parametric equivalent with active product status and ROHS3 compliance, offering an alternative sourcing option.

Compliance Considerations: All substitute parts carry ROHS3 compliance, addressing environmental and regulatory requirements. The original 3SB 1 is RoHS non-compliant and should be replaced with compliant alternatives in new designs or system upgrades.

Frequently Asked Questions (FAQ)

Q: Can the 3SB 1-R be used as a direct replacement for the 3SB 1?

A: Yes. The 3SB 1-R is the active equivalent from Bel Fuse Inc. with identical electrical and mechanical specifications. It is ROHS3 compliant and maintains the same 1 A, 250 V AC/DC slow blow characteristics and 3AB/3AG form factor.

Q: What is the difference between Littelfuse 313 series variants (HXP, MXP, VXP, HXIDP, VXIDP)?

A: All Littelfuse 313 series parts listed meet the same electrical and mechanical parameters for the 3SB 1. Variant designations reflect internal product line classifications but do not affect functional equivalence for this application.

Q: Are there dimensional differences between substitute parts?

A: The 3SB 1 and TSA-1A measure 0.250" Dia x 1.252" L (6.35mm x 31.80mm). Littelfuse 313 series parts measure 0.250" Dia x 1.250" L (6.35mm x 31.75mm). Both dimensions are within the 3AB/3AG standard form factor and are compatible with standard holders.

Q: Which substitute part offers the best availability?

A: The 0313001.HXP from Littelfuse Inc. has the highest inventory level at 12,346 units in stock, followed by the 3SB 1-R at 3,619 units.

Q: Can I use these substitutes in legacy systems designed for the 3SB 1?

A: Yes. All substitute parts are mechanically and electrically compatible with systems designed for the 3SB 1, provided the holder accepts the 3AB/3AG form factor.

Q: What approval agencies certify these substitute parts?

A: The 3SB 1-R carries CE, CSA, cULus, and PSE approvals. Littelfuse 313 series parts carry CE, CSA, PSE, and UL approvals. The TSA-1A carries cULus and UL 248 approvals. All meet industry safety standards for glass cartridge fuses.