3SB 375 Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The 3SB 375 is a 375 mA, 250 V AC/DC glass cartridge fuse manufactured by Bel Fuse Inc. with slow-blow response characteristics. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing system maintenance and new design implementations. The fuse requires a 3AB or 3AG holder and is housed in a 1/4" x 1-1/4" form factor. Substitute parts must maintain identical electrical ratings, mechanical dimensions, and holder compatibility to ensure direct interchangeability.

Substiute Parts

3SB 375

Bel Fuse Inc.In Stock: 10233SB 375 Datasheet

Current PartRFQ

0034.5217

SCHURTER Inc.In Stock: 9910034.5217 Datasheet

DirectRFQ

0313.375HXP

Littelfuse Inc.In Stock: 10580313.375HXP Datasheet

DirectRFQ

0313.375MXP

LittelfuseIn Stock: 37180313.375MXP Datasheet

DirectRFQ

0313.375VXP

Littelfuse Inc.In Stock: 7030313.375VXP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 3SB 375 is determined by strict equivalence across the following parameters:

• Current Rating: 375 mA (exact match required)
• Voltage Rating: 250 V AC (exact match required)
• Response Time: Slow Blow (exact match required)
• Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (exact match required for holder compatibility)
• Breaking Capacity: 35 A (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)

All substitute parts listed below meet these criteria and are directly interchangeable with the 3SB 375 in applications requiring 375 mA slow-blow fuse protection at 250 V AC/DC.

Parameter Comparison

Engineering Selection Recommendations

For new designs and ongoing applications, the Littelfuse 313 series parts (0313.375HXP, 0313.375MXP, 0313.375VXP) are preferred substitutes due to active product status and ROHS3 compliance. These parts maintain full electrical and mechanical equivalence to the 3SB 375 while offering improved regulatory compliance and supply chain availability.

The SCHURTER 0034.5217 provides an alternative substitute with ROHS3 compliance and active support, though it carries obsolete product status classification.

All listed substitutes carry CE, CSA, and UL approvals, ensuring compliance with international safety standards. Selection between active substitute options should be based on procurement availability and cost considerations, as all meet identical electrical and mechanical requirements.

Frequently Asked Questions (FAQ)

Q: Can the 3SB 375 be replaced with any of the listed substitute parts?

A: Yes. All listed substitute parts meet identical electrical ratings (375 mA, 250 V AC), response characteristics (slow-blow), mechanical dimensions (1/4" x 1-1/4"), and holder compatibility (3AB, 3AG). Direct substitution is supported without circuit modification.

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

A: The provided data specifies identical electrical and mechanical parameters across all three variants. Differences, if any, are not documented in the supplied parameters and should not be assumed.

Q: Are there compliance differences between substitute options?

A: Yes. The Littelfuse 313 series (0313.375HXP, 0313.375MXP, 0313.375VXP) and SCHURTER 0034.5217 are ROHS3 compliant, while the original 3SB 375 is RoHS non-compliant. All substitutes maintain CE, CSA, and UL certifications.

Q: What is the melting I²t specification and does it affect substitution?

A: Melting I²t values vary slightly among parts (ranging from 1.23 to 2.6). The 3SB 375 specifies 2.6, while active substitutes specify 1.23. This parameter was not listed as a substitution criterion in the provided data and should be evaluated against specific application requirements.

Q: Can the 3SB 375 be used in applications requiring ROHS3 compliance?

A: No. The 3SB 375 is RoHS non-compliant. ROHS3-compliant alternatives must be selected for applications with regulatory compliance requirements.

Q: What holder types are compatible with these fuses?

A: All listed parts require 3AB or 3AG holders. Mechanical dimensions are 1/4" diameter x 1-1/4" length (6.35mm x 31.75mm nominal). Verify holder compatibility before installation.