3SBP 125 Equivalent & Substitute Parts

Part Overview

The 3SBP 125 is a 125 mA, 250 V AC/DC slow-blow glass cartridge fuse in 3AB/3AG package format (1/4" x 1-1/4" axial). Manufactured by Bel Fuse Inc., this component is classified as obsolete. Due to its discontinued status, equivalent substitute parts from active manufacturers are necessary for ongoing system maintenance and new design implementations where this fuse specification is required.

Substiute Parts

3SBP 125

Bel Fuse Inc.In Stock: 11803SBP 125 Datasheet

Current PartRFQ

0315.125HXP

Littelfuse Inc.In Stock: 9080315.125HXP Datasheet

DirectRFQ

0315.125MXP

LittelfuseIn Stock: 9730315.125MXP Datasheet

DirectRFQ

0315.125VXP

Littelfuse Inc.In Stock: 8540315.125VXP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 3SBP 125 is based on electrical and mechanical parameter equivalence. The following criteria determine valid substitutes:

• Current Rating: 125 mA (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" (Axial) (exact match required)
• Mounting Type: Through Hole (exact match required)
• Breaking Capacity @ Rated Voltage: 35 A (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)

All three substitute parts from Littelfuse Inc. (0315.125HXP, 0315.125MXP, 0315.125VXP) meet these electrical and mechanical requirements and are classified as active products.

Parameter Comparison

Engineering Selection Recommendations

All three Littelfuse substitute parts (0315.125HXP, 0315.125MXP, 0315.125VXP) are functionally equivalent to the 3SBP 125 based on electrical and mechanical parameters. The substitute parts offer the following advantages:

• Active product status ensures ongoing availability and supply chain continuity
• ROHS3 compliance aligns with current environmental and regulatory standards
• Maintained certifications (CE, CSA, UL) support compliance requirements
• Dimensional tolerances remain within acceptable mechanical compatibility ranges for standard 3AB/3AG fuse holders

Selection among the three substitute parts may be based on inventory availability and packaging preferences, as all three are electrically and mechanically interchangeable.

Frequently Asked Questions (FAQ)

Q: Can the Littelfuse 0315.125HXP, 0315.125MXP, or 0315.125VXP directly replace the 3SBP 125?

A: Yes. All three Littelfuse parts meet the electrical specifications (125 mA, 250 V AC, slow-blow response) and mechanical requirements (3AB/3AG package, 1/4" x 1-1/4" axial format, through-hole mounting) of the 3SBP 125.

Q: What is the difference between the three Littelfuse substitute parts?

A: The 0315.125HXP, 0315.125MXP, and 0315.125VXP are electrically and mechanically identical. Differences exist only in packaging format (all listed as Bulk) and internal product designations within the Littelfuse 315 series.

Q: Are there dimensional compatibility concerns?

A: The substitute parts have minor dimensional variations (0.275" Dia x 1.275" L versus 0.272" Dia x 1.280" L for the original). These variations remain within standard mechanical tolerances for 3AB/3AG fuse holders and do not affect functional compatibility.

Q: Does the RoHS compliance difference matter?

A: The substitute parts are ROHS3 compliant, while the 3SBP 125 is RoHS non-compliant. For new designs and systems subject to RoHS regulations, the compliant substitutes are required. For legacy system maintenance, compatibility depends on system-level RoHS requirements.

Q: Are the approval certifications equivalent?

A: The substitute parts carry CE, CSA, and UL certifications. The original 3SBP 125 includes PSE certification, which is not listed for the substitutes. Verify PSE certification requirements for your specific application before selection.