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

Part Overview

The 3SBP 3-R is a 3 A, 250 V AC/DC glass cartridge fuse manufactured by Bel Fuse Inc., designed for through-hole mounting in 3AB and 3AG package configurations. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing system maintenance and new design implementations. The fuse provides slow-blow response characteristics suitable for applications requiring transient current tolerance before circuit protection activation.

Substiute Parts

3SBP 3-R

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

Current PartRFQ

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

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

• Current Rating: 3 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)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)

All three substitute parts—0315003.HXP, 0315003.MXP, and 0315003.VXP—manufactured by Littelfuse Inc., meet these criteria and are classified as active products with current availability.

Parameter Comparison

Engineering Selection Recommendations

All three Littelfuse substitute parts (0315003.HXP, 0315003.MXP, 0315003.VXP) are functionally equivalent to the obsolete 3SBP 3-R and maintain active product status with current manufacturing support. The substitute parts carry expanded regulatory approvals including UL certification, providing broader compliance coverage than the original part.

Selection among the three Littelfuse variants should be based on specific regulatory requirements for the target application. The 0315003.HXP and 0315003.MXP variants include K-MARK approval, while 0315003.VXP includes KC approval. All three parts are ROHS3 compliant and REACH unaffected, meeting environmental regulatory requirements.

Physical dimensions show minor variations within acceptable tolerances for 3AB/3AG package specifications. DC cold resistance values are lower in the substitute parts (0.0593 Ohms versus 0.07 Ohms), and breaking capacity is reduced from 200A to 100A. These differences remain within the functional envelope for slow-blow cartridge fuse applications at 3 A, 250 V ratings.

Frequently Asked Questions (FAQ)

Q: Can the Littelfuse 0315003 series parts directly replace the obsolete 3SBP 3-R?

A: Yes. The 0315003.HXP, 0315003.MXP, and 0315003.VXP parts meet all critical electrical and mechanical parameters: 3 A current rating, 250 V AC voltage rating, slow-blow response, cartridge glass fuse type, and 3AB/3AG package configuration with through-hole mounting.

Q: What are the differences between 0315003.HXP, 0315003.MXP, and 0315003.VXP?

A: The three parts are electrically and mechanically identical. Differences exist only in regulatory approvals: 0315003.HXP and 0315003.MXP include K-MARK certification, while 0315003.VXP includes KC certification. Selection depends on target market regulatory requirements.

Q: Are there dimensional compatibility concerns with the substitute parts?

A: Substitute parts show minor dimensional variations (0.275" Dia x 1.275" L versus 0.272" Dia x 1.280" L). These differences fall within standard 3AB/3AG package tolerances and do not affect mechanical fit in standard fuse holders.

Q: How do the electrical characteristics compare?

A: DC cold resistance is lower in substitute parts (0.0593 Ohms versus 0.07 Ohms), and breaking capacity is reduced from 200A to 100A. Melting I²t is higher in substitutes (200 versus 146). These variations remain within acceptable parameters for 3 A, 250 V slow-blow fuse applications.

Q: What regulatory approvals apply to each substitute part?

A: All three substitute parts carry CE, CSA, PSE, and ROHS3 compliance. 0315003.HXP and 0315003.MXP include K-MARK approval. 0315003.VXP includes KC approval. All include UL certification, expanding compliance beyond the original part.

Q: Is inventory availability a consideration?

A: Current inventory levels are 876 units (0315003.HXP), 1153 units (0315003.MXP), and 939 units (0315003.VXP), all classified as new original stock. The original 3SBP 3-R shows 1395 units in inventory but is obsolete with no ongoing manufacturing support.