3SBP 8 Equivalent & Substitute Parts

Part Overview

The 3SBP 8 is an 8 A 250 V AC DC fuse cartridge manufactured by Bel Fuse Inc. in a glass through-hole package (3AB, 3AG format). This component is classified as obsolete, making equivalent substitute parts necessary for ongoing system maintenance and new designs. The fuse operates with slow-blow response characteristics and is rated for -55°C to 125°C operating temperature range.

Substiute Parts

3SBP 8

Bel Fuse Inc.In Stock: 8103SBP 8 Datasheet

Current PartRFQ

0315008.HXP

Littelfuse Inc.In Stock: 10290315008.HXP Datasheet

DirectRFQ

0315008.MXP

Littelfuse Inc.In Stock: 34110315008.MXP Datasheet

DirectRFQ

0315008.VXP

Littelfuse Inc.In Stock: 6930315008.VXP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 3SBP 8 are qualified based on the following electrical and mechanical parameters:

• Current Rating: 8 A (exact match required)
• Voltage Rating (AC): 250 V (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (Axial) (exact match required)
• Response Time: Slow Blow (exact match required)
• Mounting Type: Through Hole (exact match required)
• Breaking Capacity @ Rated Voltage: 200 A (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)

All three substitute parts from Littelfuse Inc. (0315008.HXP, 0315008.MXP, 0315008.VXP) meet these criteria and are classified as active products, providing direct functional equivalence to the obsolete 3SBP 8.

Parameter Comparison

Engineering Selection Recommendations

All three Littelfuse substitute parts (0315008.HXP, 0315008.MXP, 0315008.VXP) provide direct functional equivalence to the 3SBP 8. Selection among these active alternatives should be based on:

• Product availability: 0315008.MXP offers the highest inventory (3400 pcs), followed by 0315008.HXP (940 pcs) and 0315008.VXP (660 pcs)
• Regulatory compliance: All three substitutes are ROHS3 compliant, addressing the non-compliance status of the original 3SBP 8
• Certification scope: 0315008.VXP includes KC certification in addition to CE, CSA, PSE, and UL; 0315008.HXP and 0315008.MXP include K-MARK certification

Minor dimensional variations exist (0.003" diameter difference, 0.005" length difference) and are within acceptable tolerances for 3AB/3AG package specifications. DC cold resistance and melting I²t values differ slightly but remain within the functional parameters of slow-blow 8 A cartridge fuses.

Frequently Asked Questions (FAQ)

Q: Can 0315008.HXP, 0315008.MXP, and 0315008.VXP be used interchangeably with the 3SBP 8?

A: Yes. All three Littelfuse parts meet the electrical and mechanical specifications of the 3SBP 8, including current rating, voltage rating, fuse type, package format, response time, and operating temperature range. They are direct functional equivalents.

Q: What is the difference between 0315008.HXP, 0315008.MXP, and 0315008.VXP?

A: These parts are electrically and mechanically identical. Differences exist only in certification scope (K-MARK vs. KC) and inventory availability. Selection can be based on supply chain requirements and regional certification needs.

Q: Why is the 3SBP 8 listed as obsolete?

A: The 3SBP 8 is no longer in active production by Bel Fuse Inc. The Littelfuse 315 series substitutes provide equivalent functionality and are actively manufactured, making them the recommended choice for new designs and replacements.

Q: Are there any compatibility concerns with the dimensional differences?

A: No. The dimensional variations between the 3SBP 8 (0.272" Dia x 1.280" L) and the Littelfuse substitutes (0.275" Dia x 1.275" L) are within acceptable tolerances for 3AB/3AG package specifications and do not affect mechanical fit or electrical performance in standard through-hole applications.

Q: What is the significance of the RoHS compliance difference?

A: The 3SBP 8 is RoHS non-compliant, while all three Littelfuse substitutes are ROHS3 compliant. For applications subject to RoHS regulations, the Littelfuse parts are required. For legacy systems without RoHS requirements, both options remain functionally equivalent.