3SBP 1.6-R Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The 3SBP 1.6-R is a 1.6 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, making equivalent substitute parts necessary for ongoing system maintenance and new designs requiring this fuse specification.

Substiute Parts

3SBP 1.6-R

Bel Fuse Inc.In Stock: 10773SBP 1.6-R Datasheet

Current PartRFQ

031501.6HXP

Littelfuse Inc.In Stock: 1225031501.6HXP Datasheet

DirectRFQ

031501.6MXP

Littelfuse Inc.In Stock: 1081031501.6MXP Datasheet

DirectRFQ

031501.6VXP

Littelfuse Inc.In Stock: 970031501.6VXP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 3SBP 1.6-R are qualified based on the following critical parameters:

• Current Rating: 1.6 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 / 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—031501.6HXP, 031501.6MXP, and 031501.6VXP—manufactured by Littelfuse Inc. meet these core electrical and mechanical parameters. These parts are classified as active products, ensuring long-term availability and supply chain continuity.

Parameter Comparison

Engineering Selection Recommendations

All three Littelfuse substitute parts (031501.6HXP, 031501.6MXP, 031501.6VXP) are direct functional equivalents to the obsolete 3SBP 1.6-R. Selection among these three active alternatives is based on:

• Product Status: All substitutes are active products with confirmed long-term availability, eliminating obsolescence risk associated with the original 3SBP 1.6-R.
• Regulatory Compliance: All substitutes carry CE, CSA, PSE, and UL certifications, meeting or exceeding the certification profile of the original part (CE, CSA, cULus, PSE).
• Electrical Equivalence: Identical current rating, voltage rating, response time, and operating temperature range ensure drop-in compatibility in existing circuit designs.
• Mechanical Compatibility: Matching package dimensions (0.275" Dia x 1.275" L) and 3AB/3AG form factor ensure physical fit in standard fuse holders.

Frequently Asked Questions (FAQ)

Q: Can 031501.6HXP, 031501.6MXP, and 031501.6VXP be used interchangeably with the 3SBP 1.6-R?

A: Yes. All three Littelfuse parts meet the identical electrical and mechanical specifications: 1.6 A, 250 V AC, slow-blow response, 3AB/3AG package, and -55°C to 125°C operating range. They are direct functional substitutes.

Q: What is the difference between 031501.6HXP, 031501.6MXP, and 031501.6VXP?

A: These three part numbers represent different internal designations within the Littelfuse 315 series, all sharing identical electrical and mechanical parameters. Selection among them is based on packaging availability and supply chain considerations rather than technical performance differences.

Q: Are the physical dimensions compatible with existing fuse holders?

A: Yes. The substitute parts measure 0.275" Dia x 1.275" L (6.99mm x 32.39mm), which is dimensionally equivalent to the original 3SBP 1.6-R at 0.272" Dia x 1.280" L (6.90mm x 32.50mm). Both conform to the 3AB/3AG standard form factor and fit standard through-hole fuse holders.

Q: Do the substitute parts carry the same regulatory certifications?

A: The substitute parts carry CE, CSA, PSE, and UL certifications. The original 3SBP 1.6-R carried CE, CSA, cULus, and PSE certifications. The substitute parts meet or exceed the original certification requirements.

Q: Why is the 3SBP 1.6-R obsolete?

A: The 3SBP 1.6-R is classified as obsolete by Bel Fuse Inc. The active Littelfuse equivalents (031501.6HXP, 031501.6MXP, 031501.6VXP) provide continued access to this fuse specification with assured long-term availability.