3SBP 375 Equivalent & Substitute Parts

Part Overview

The 3SBP 375 is a 375 mA, 250 V AC/DC slow-blow glass fuse cartridge manufactured by Bel Fuse Inc. in the 3AB/3AG form factor (1/4" x 1-1/4" axial). This component is classified as obsolete, making equivalent substitute parts necessary for ongoing system maintenance and new design implementations. Littelfuse Inc. produces direct functional equivalents that maintain electrical and mechanical compatibility while offering active product status and improved compliance certifications.

Key Parameters

Parameter	Value
Current Rating	375 mA
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Slow Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4" (Axial)
Mounting Type	Through Hole
Breaking Capacity @ Rated Voltage	35 A
Operating Temperature Range	-55°C ~ 125°C

Substitute Part Grouping Explanation

Substitution of the 3SBP 375 is determined by strict equivalence across the following critical parameters:

Current Rating: 375 mA (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)
Breaking Capacity: 35 A (exact match required)

All three Littelfuse substitute parts (0315.375HXP, 0315.375MXP, 0315.375VXP) meet these criteria and are electrically and mechanically interchangeable with the 3SBP 375.

Parameter Comparison

Parameter	3SBP 375 (Bel Fuse)	0315.375HXP (Littelfuse)	0315.375MXP (Littelfuse)	0315.375VXP (Littelfuse)
Current Rating (Amps)	375 mA	375 mA	375 mA	375 mA
Voltage Rating - AC	250 V	250 V	250 V	250 V
Fuse Type	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass
Response Time	Slow Blow	Slow Blow	Slow Blow	Slow Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4"	3AB, 3AG, 1/4" x 1-1/4"	3AB, 3AG, 1/4" x 1-1/4"	3AB, 3AG, 1/4" x 1-1/4"
Breaking Capacity @ Rated Voltage	35 A	35 A	35 A	35 A
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Size / Dimension	0.272" Dia x 1.280" L (6.90mm x 32.50mm)	0.275" Dia x 1.275" L (6.99mm x 32.39mm)	0.275" Dia x 1.275" L (6.99mm x 32.39mm)	0.275" Dia x 1.275" L (6.99mm x 32.39mm)
DC Cold Resistance	2.8 Ohms	2.095 Ohms	2.095 Ohms	2.095 Ohms
Approval Agency	CE, CSA, PSE, UL	CE, CSA, UL	CE, CSA, UL	CE, CSA, UL
Product Status	Obsolete	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All three Littelfuse substitute parts (0315.375HXP, 0315.375MXP, 0315.375VXP) provide direct functional equivalence to the 3SBP 375. Selection among these three options is based on product availability and supply chain considerations:

0315.375VXP: 1178 Pcs in stock
0315.375MXP: 1134 Pcs in stock
0315.375HXP: 770 Pcs in stock

All three substitute parts carry active product status, ROHS3 compliance, and CE/CSA/UL certifications. The Littelfuse parts demonstrate lower DC cold resistance (2.095 Ohms vs. 2.8 Ohms) and identical melting I²t characteristics (1.23 vs. 2.6 for the original), indicating improved thermal performance within the same electrical specification envelope.

Frequently Asked Questions (FAQ)

Q: Are the Littelfuse 0315.375HXP, 0315.375MXP, and 0315.375VXP parts fully interchangeable with the 3SBP 375?

A: Yes. All three Littelfuse parts match the 3SBP 375 across all critical electrical and mechanical parameters: 375 mA current rating, 250 V AC voltage rating, slow-blow response, 3AB/3AG package, 35 A breaking capacity, and through-hole mounting. Physical dimensions are within acceptable tolerance for standard fuse holder applications.

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

A: The 0315.375HXP, 0315.375MXP, and 0315.375VXP parts are electrically and mechanically identical. Differences exist only in packaging designation and inventory availability. Selection should be based on supply chain availability and internal part numbering conventions.

Q: Why does the 3SBP 375 show obsolete status?

A: The 3SBP 375 is classified as obsolete by Bel Fuse Inc., indicating discontinued production. The Littelfuse equivalents maintain active product status and ensure long-term availability for system maintenance and new designs.

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

A: The original 3SBP 375 is RoHS non-compliant, while all three Littelfuse substitutes are ROHS3 compliant. Both the original and substitutes carry CE, CSA, and UL certifications. The Littelfuse parts do not carry PSE certification, which was present on the original part.

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

A: The Littelfuse substitutes exhibit lower DC cold resistance (2.095 Ohms vs. 2.8 Ohms). This represents improved electrical efficiency and reduced heat generation during normal operation, while maintaining identical current and voltage ratings.

Q: Can these fuses be used in any 3AB/3AG fuse holder?

A: Yes. All parts conform to the 3AB/3AG standard form factor (1/4" x 1-1/4" axial) and are designed for through-hole mounting in standard fuse holders rated for 250 V AC and 375 mA operation.

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