3SBP 1.5-R Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The 3SBP 1.5-R is a 1.5 A, 250 V AC/DC glass cartridge fuse manufactured by Bel Fuse Inc. in the 3AB/3AG form factor with slow-blow response characteristics. This part is classified as obsolete, making equivalent substitute parts necessary for ongoing system maintenance and new designs requiring compatible fuse protection.

Substiute Parts

3SBP 1.5-R

Bel Fuse Inc.In Stock: 10983SBP 1.5-R Datasheet

Current PartRFQ

031501.5HXP

Littelfuse Inc.In Stock: 1010031501.5HXP Datasheet

DirectRFQ

031501.5MXP

Littelfuse Inc.In Stock: 1976031501.5MXP Datasheet

DirectRFQ

031501.5VXP

Littelfuse Inc.In Stock: 1019031501.5VXP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 3SBP 1.5-R are qualified based on the following critical parameters:

• Current Rating: 1.5 A (exact match required)
• Voltage Rating: 250 V AC (exact match required)
• Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (Axial) (exact match required)
• Response Time: Slow Blow (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Mounting Type: Through Hole (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)

All substitute parts listed are manufactured by Littelfuse Inc. under the 315 series and meet these critical electrical and mechanical parameters. The substitutes are direct functional equivalents suitable for replacement in applications originally designed for the 3SBP 1.5-R.

Parameter Comparison

Engineering Selection Recommendations

All three Littelfuse 315 series substitutes (031501.5HXP, 031501.5MXP, 031501.5VXP) are active products with full regulatory compliance. The substitutes carry CE, CSA, PSE, and UL certifications, meeting or exceeding the approval agencies listed for the original 3SBP 1.5-R.

The primary difference between the main part and substitutes is the breaking capacity at rated voltage: the 3SBP 1.5-R specifies 200A, while the Littelfuse alternatives specify 100A. This parameter difference must be evaluated against the specific application requirements. Dimensional tolerances between the main part (0.272" Dia x 1.280" L) and substitutes (0.275" Dia x 1.275" L) are within typical manufacturing ranges for 3AB/3AG form factor cartridge fuses and do not affect mechanical fit in standard fuse holders.

All substitute parts maintain identical electrical performance in the 1.5 A, 250 V AC/DC slow-blow category and are suitable for direct replacement where the 100A breaking capacity is acceptable for the application.

Frequently Asked Questions (FAQ)

Q: Can 031501.5HXP, 031501.5MXP, and 031501.5VXP be used interchangeably with the 3SBP 1.5-R?

A: Yes. All three Littelfuse parts are direct functional equivalents with identical current rating, voltage rating, response time, package form factor, and operating temperature range. They are mechanically and electrically compatible with applications designed for the 3SBP 1.5-R.

Q: What is the significance of the 200A vs. 100A breaking capacity difference?

A: Breaking capacity defines the maximum fault current the fuse can safely interrupt without rupturing the fuse body. The 3SBP 1.5-R has a 200A breaking capacity, while the Littelfuse substitutes have 100A. Applications with fault currents exceeding 100A require evaluation to confirm the lower breaking capacity is acceptable.

Q: Are the dimensional differences between the main part and substitutes a concern?

A: No. The dimensional variations (0.272" Dia x 1.280" L versus 0.275" Dia x 1.275" L) are within standard manufacturing tolerances for 3AB/3AG cartridge fuses and do not affect fit in standard fuse holders or clips.

Q: Do all substitute parts have the same regulatory certifications?

A: The substitutes carry CE, CSA, PSE, and UL certifications. The original 3SBP 1.5-R includes cULus certification. Both UL and cULus are recognized North American standards; the substitutes meet current UL requirements.

Q: What is the difference between 031501.5HXP, 031501.5MXP, and 031501.5VXP?

A: All three parts share identical electrical and mechanical specifications. The part number suffix variation (HXP, MXP, VXP) indicates different manufacturing or packaging designations from Littelfuse but does not affect functional performance or compatibility.