3SBP 8-R Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The 3SBP 8-R is an 8 A, 250 V AC/DC slow-blow glass cartridge fuse manufactured by Bel Fuse Inc. in the 3AB/3AG form factor (1/4" x 1-1/4" axial). This part is classified as obsolete. Equivalent substitute parts from Littelfuse Inc. are available in active product status, offering direct functional replacement with identical electrical and mechanical specifications.

Substiute Parts

3SBP 8-R

Bel Fuse Inc.In Stock: 11693SBP 8-R 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-R are qualified based on the following critical parameters:

• Current Rating: 8 A (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: 200 A (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)

All three Littelfuse 315 series parts (0315008.HXP, 0315008.MXP, 0315008.VXP) meet these criteria and are direct functional equivalents.

Parameter Comparison

Engineering Selection Recommendations

All three Littelfuse 315 series substitute parts (0315008.HXP, 0315008.MXP, 0315008.VXP) are qualified replacements for the obsolete 3SBP 8-R. Selection among these three variants should be based on:

Product Availability: 0315008.MXP offers the highest inventory level (3400 pcs), followed by 0315008.HXP (940 pcs) and 0315008.VXP (660 pcs).

Regulatory Compliance: All three parts carry CE, CSA, PSE, and UL certifications. 0315008.HXP and 0315008.MXP include K-MARK certification, while 0315008.VXP includes KC certification. Selection depends on target market regulatory requirements.

Electrical Performance: All three substitutes maintain identical current rating, voltage rating, breaking capacity, and operating temperature range. Minor variations in DC cold resistance (0.0111 Ohms vs. 0.014 Ohms) and melting I²t (445 vs. 483) are within acceptable tolerance for slow-blow cartridge fuse applications.

Physical Dimensions: Substitute parts exhibit negligible dimensional variation (0.003" diameter difference, 0.005" length difference) and are mechanically compatible with 3AB/3AG form factor specifications.

Frequently Asked Questions (FAQ)

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

A: Yes. All three Littelfuse parts are direct functional equivalents. They share identical current rating (8 A), voltage rating (250 V AC), fuse type (cartridge, glass), response time (slow blow), package form factor (3AB/3AG), mounting type (through hole), breaking capacity (200 A), and operating temperature range (-55°C ~ 125°C).

Q: What are the differences between the three Littelfuse substitute options?

A: The three parts are electrically and mechanically identical. Differences are limited to inventory availability, packaging format (all bulk), and regulatory certifications. 0315008.MXP and 0315008.HXP carry K-MARK certification, while 0315008.VXP carries KC certification.

Q: Are there dimensional compatibility concerns?

A: Dimensional variation between the 3SBP 8-R and substitute parts is minimal (0.003" diameter, 0.005" length). Both the original and substitute parts conform to the 3AB/3AG form factor standard and are mechanically compatible with through-hole mounting applications.

Q: How do the electrical characteristics compare?

A: DC cold resistance differs slightly (0.014 Ohms for 3SBP 8-R vs. 0.0111 Ohms for substitutes) and melting I²t differs (483 vs. 445). These variations are within acceptable tolerance for slow-blow cartridge fuse applications and do not affect functional compatibility.

Q: Which substitute part should be selected for new designs?

A: 0315008.MXP is recommended for new designs due to active product status, highest inventory availability (3400 pcs), and comprehensive regulatory certifications (CE, CSA, K-MARK, PSE, UL).