3SBP 3 Equivalent & Substitute Parts

Part Overview

The 3SBP 3 is a 3 A, 250 V AC/DC slow-blow glass cartridge fuse with 3AB/3AG package configuration, manufactured by Bel Fuse Inc. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system maintenance and repair applications. Substitute parts must maintain identical electrical ratings, mechanical dimensions, and thermal characteristics to ensure direct interchangeability in existing circuit designs.

Substiute Parts

3SBP 3

Bel Fuse Inc.In Stock: 9293SBP 3 Datasheet

Current PartRFQ

3SBP 3-R

Bel Fuse Inc.In Stock: 14473SBP 3-R Datasheet

DirectRFQ

0315003.HXP

Littelfuse Inc.In Stock: 9100315003.HXP Datasheet

DirectRFQ

0315003.MXP

Littelfuse Inc.In Stock: 12170315003.MXP Datasheet

DirectRFQ

0315003.VXP

Littelfuse Inc.In Stock: 9550315003.VXP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 3SBP 3 is determined by strict equivalence across the following critical parameters:

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

All identified substitute parts meet these criteria. Variations in breaking capacity, melting I²t, and RoHS compliance status do not affect functional interchangeability in the circuit application, provided the core electrical and mechanical parameters remain constant.

Parameter Comparison

Engineering Selection Recommendations

For applications requiring direct replacement of the obsolete 3SBP 3, the following selection criteria apply:

Active Product Status Priority: The Littelfuse 0315003.HXP, 0315003.MXP, and 0315003.VXP series are classified as active products, ensuring long-term availability and supply chain continuity. The 3SBP 3-R remains available but shares obsolete status with the original part.

Regulatory Compliance: All substitute parts carry ROHS3 compliance, addressing modern environmental and regulatory requirements. The original 3SBP 3 is RoHS non-compliant. Littelfuse variants provide expanded certification coverage including K-MARK and KC approvals, supporting broader geographic deployment.

Dimensional Tolerance: Littelfuse parts exhibit minor dimensional variations (0.275" Dia x 1.275" L versus 0.272" Dia x 1.280" L). These differences remain within standard mechanical tolerance ranges for 3AB/3AG package specifications and do not affect through-hole mounting compatibility.

Electrical Equivalence: All substitute parts maintain identical current rating (3 A), voltage rating (250 V AC), response time (slow blow), and operating temperature range (-55°C ~ 125°C). DC cold resistance variations (0.0593 Ohms for Littelfuse versus 0.07 Ohms for Bel Fuse) are negligible for circuit protection applications.

Frequently Asked Questions (FAQ)

Q: Can 0315003.HXP, 0315003.MXP, and 0315003.VXP be used interchangeably with the 3SBP 3?

A: Yes. All three Littelfuse parts meet the critical substitution parameters: 3 A current rating, 250 V AC voltage rating, slow-blow response, 3AB/3AG package configuration, and through-hole mounting. Dimensional and resistance variations are within acceptable tolerance for circuit protection applications.

Q: What is the difference between 0315003.HXP, 0315003.MXP, and 0315003.VXP?

A: These three parts are electrically and mechanically identical. Differences exist only in regulatory certifications: 0315003.HXP includes K-MARK approval, 0315003.MXP includes K-MARK approval, and 0315003.VXP includes KC approval. Selection depends on geographic market requirements and certification mandates.

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

A: Obsolete status indicates the manufacturer has discontinued production. Substitute parts from active product lines ensure continued availability for replacement and repair applications.

Q: Are the dimensional differences between Bel Fuse and Littelfuse parts significant?

A: No. The variations (0.272" to 0.275" diameter and 1.280" to 1.275" length) fall within standard mechanical tolerances for 3AB/3AG cartridge fuses and do not affect through-hole mounting or circuit board compatibility.

Q: Does RoHS3 compliance affect electrical performance?

A: No. RoHS3 compliance addresses material composition and environmental standards. Electrical performance, current rating, voltage rating, and response time remain unchanged. Modern designs should prioritize RoHS3-compliant alternatives.

Q: Can I use 3SBP 3-R as a substitute?

A: Yes, 3SBP 3-R is electrically and mechanically equivalent. However, it shares obsolete status with the original 3SBP 3. For long-term supply assurance, Littelfuse active products are preferred.