3SBP 375-R Equivalent & Substitute Parts

Part Overview

The 3SBP 375-R is a 375 mA, 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 substitutes necessary for ongoing system maintenance and new designs. Littelfuse Inc. produces direct functional equivalents that maintain identical electrical and mechanical specifications while offering active product status and improved availability.

Substiute Parts

3SBP 375-R

Bel Fuse Inc.In Stock: 7643SBP 375-R Datasheet

Current PartRFQ

0315.375HXP

Littelfuse Inc.In Stock: 8470315.375HXP Datasheet

DirectRFQ

0315.375MXP

Littelfuse Inc.In Stock: 11460315.375MXP Datasheet

DirectRFQ

0315.375VXP

Littelfuse Inc.In Stock: 12380315.375VXP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 3SBP 375-R is determined by strict equivalence across the following parameters: current rating (375 mA), voltage rating (250 V AC), response time (slow blow), fuse type (cartridge glass), and mechanical package (3AB, 3AG, 1/4" x 1-1/4" axial). All three Littelfuse substitutes—0315.375HXP, 0315.375MXP, and 0315.375VXP—meet these core requirements. These parts are functionally interchangeable in applications requiring 375 mA protection at 250 V AC/DC with slow-blow characteristics and identical form factor compatibility.

Parameter Comparison

Engineering Selection Recommendations

All three Littelfuse substitutes (0315.375HXP, 0315.375MXP, 0315.375VXP) are direct functional equivalents to the obsolete 3SBP 375-R. Selection among these three active alternatives is based on availability and packaging preference, as they share identical electrical and mechanical specifications. All substitutes maintain ROHS3 compliance and carry CE, CSA, and UL certifications, meeting regulatory requirements for the original part. The transition from the obsolete Bel Fuse part to any of these Littelfuse equivalents presents no technical barriers for circuit-level compatibility or thermal performance within the specified operating range.

Frequently Asked Questions (FAQ)

Q: Can the Littelfuse 0315.375HXP, 0315.375MXP, or 0315.375VXP be used as direct replacements for the 3SBP 375-R?

A: Yes. All three Littelfuse parts are direct functional equivalents. They share identical current rating (375 mA), voltage rating (250 V AC), response time (slow blow), fuse type (cartridge glass), and mechanical package (3AB, 3AG, 1/4" x 1-1/4" axial). Physical dimensions are within acceptable tolerance for through-hole mounting compatibility.

Q: What is the difference between the three Littelfuse substitute options?

A: The 0315.375HXP, 0315.375MXP, and 0315.375VXP are electrically and mechanically identical. Differences exist only in packaging configuration and internal manufacturing variants. Selection should be based on inventory availability and packaging requirements for your application.

Q: Are there any compliance or certification differences between the original and substitute parts?

A: The original 3SBP 375-R carries CE, CSA, and cULus certifications. The Littelfuse substitutes carry CE, CSA, and UL certifications. Both certification sets meet industrial and safety standards. All parts are ROHS3 compliant.

Q: Will the dimensional variation between the original and substitute parts affect circuit board compatibility?

A: The dimensional differences are minimal (0.272" to 0.275" diameter, 1.280" to 1.275" length). These variations fall within standard mechanical tolerances for 3AB, 3AG form factor fuses and will not affect through-hole mounting compatibility or circuit board layout.

Q: What is the impact of the DC cold resistance difference?

A: The original part specifies 2.5 Ohms while substitutes specify 2.095 Ohms. This difference is within acceptable tolerance for fuse cartridges and does not affect circuit protection performance or thermal characteristics in typical applications.