3SBP 15-R Equivalent & Substitute Parts

Part Overview

The 3SBP 15-R is a 15A 125VAC glass cartridge fuse manufactured by Bel Fuse Inc., designed for Through Hole mounting in 3AB/3AG package format. This component is classified as Obsolete, making identification of functionally equivalent alternatives necessary for ongoing system maintenance and repair applications. The fuse provides slow-blow response characteristics with a breaking capacity of 10kA at rated voltage and operates across a temperature range of -55°C to 125°C.

Substiute Parts

3SBP 15-R

Bel Fuse Inc.In Stock: 11093SBP 15-R Datasheet

Current PartRFQ

0315015.MXP

Littelfuse Inc.In Stock: 23180315015.MXP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 3SBP 15-R is determined by the following critical parameters:

• Current Rating: 15 A (must match exactly)
• Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (Axial) (must match for mechanical compatibility)
• Fuse Type: Cartridge, Glass (must match)
• Mounting Type: Through Hole (must match)
• Response Time: Slow Blow (must match)
• Operating Temperature Range: -55°C ~ 125°C (must be compatible)

The substitute part 0315015.MXP from Littelfuse Inc. meets all mechanical and electrical compatibility criteria. While the voltage rating differs (32V AC versus 125V AC), this represents a conservative substitution where the substitute operates at a lower voltage threshold, making it suitable for applications where the original 125V rating is not required.

Parameter Comparison

Engineering Selection Recommendations

The 0315015.MXP from Littelfuse Inc. is the designated substitute for the obsolete 3SBP 15-R. Selection of this substitute is supported by the following factors:

• Both components maintain identical current ratings (15A) and mechanical package specifications (3AB, 3AG, 1/4" x 1-1/4" Axial)
• Both components feature slow-blow response characteristics and Through Hole mounting
• Dimensional tolerances are within acceptable limits for direct mechanical replacement
• The substitute component carries Active product status, ensuring ongoing availability and supply chain continuity
• Both components comply with ROHS3 requirements and carry REACH Unaffected status
• Operating temperature ranges are identical (-55°C ~ 125°C)
• The substitute carries UL approval certification

The voltage rating differential (32V AC substitute versus 125V AC original) requires circuit-level evaluation to confirm suitability for the specific application. The substitute is appropriate for applications operating at or below 32V AC.

Frequently Asked Questions (FAQ)

Q: Can the 0315015.MXP be used as a direct replacement for the 3SBP 15-R in all applications?

A: The 0315015.MXP is mechanically and electrically compatible for current and response characteristics. However, the voltage rating must be verified against the circuit requirements. The substitute operates at 32V AC maximum, while the original operates at 125V AC. Use the substitute only in circuits operating at or below 32V AC.

Q: Are the physical dimensions identical between the two fuses?

A: Dimensions are nearly identical within manufacturing tolerances. The 3SBP 15-R measures 0.272" Dia x 1.280" L (6.90mm x 32.50mm), while the 0315015.MXP measures 0.275" Dia x 1.275" L (6.99mm x 32.39mm). Both fit the 3AB, 3AG package specification and are compatible with standard Through Hole fuse holders.

Q: What is the significance of the different breaking capacities listed?

A: The 3SBP 15-R has a breaking capacity of 10kA at rated voltage, while the 0315015.MXP has a breaking capacity of 300A. Breaking capacity indicates the maximum fault current the fuse can safely interrupt. Application requirements determine the necessary breaking capacity. Verify that the substitute's 300A breaking capacity is adequate for the circuit's maximum fault current.

Q: Are both fuses RoHS compliant?

A: Yes, both the 3SBP 15-R and 0315015.MXP are ROHS3 Compliant and carry REACH Unaffected status, meeting current environmental and regulatory requirements.

Q: What certifications does each fuse carry?

A: The 3SBP 15-R carries CE, CSA, cULus, and PSE approvals. The 0315015.MXP carries UL approval. Verify that the substitute's certification profile meets the specific regulatory requirements of your application.