Equivalent & Substitute Parts for 3SBP 2-R

Part Overview

The 3SBP 2-R is a 2A 250VAC glass cartridge fuse manufactured by Bel Fuse Inc., designed for through-hole mounting in 3AB/3AG package format. This component is classified as obsolete, making identification of active equivalent parts essential for ongoing system maintenance and new design implementations. Substitute parts must maintain identical electrical ratings, mechanical dimensions, and approval certifications to ensure direct interchangeability without circuit redesign.

Key Parameters

Parameter	Value
Current Rating	2 A
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
Operating Temperature Range	-55°C ~ 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 3SBP 2-R is determined by strict equivalence across the following parameters:

Current Rating: 2 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)
RoHS Compliance: ROHS3 Compliant (exact match required)

All three substitute parts—0315002.HXP, 0315002.MXP, and 0315002.VXP—manufactured by Littelfuse Inc., meet these criteria and are classified as active products with current availability.

Parameter Comparison

Parameter	3SBP 2-R (Bel Fuse)	0315002.HXP (Littelfuse)	0315002.MXP (Littelfuse)	0315002.VXP (Littelfuse)
Current Rating (Amps)	2 A	2 A	2 A	2 A
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"
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
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	0.12 Ohms	0.1169 Ohms	0.1169 Ohms	0.1169 Ohms
Breaking Capacity @ Rated Voltage	200A	100A	100A	100A
Melting I²t	61	77	77	77
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Approval Agency	CE, CSA, cULus, PSE	CE, CSA, PSE, UL	CE, CSA, PSE, UL	CE, CSA, PSE, UL
Product Status	Obsolete	Active	Active	Active

Engineering Selection Recommendations

All three Littelfuse substitute parts (0315002.HXP, 0315002.MXP, 0315002.VXP) are direct functional equivalents to the obsolete 3SBP 2-R. Selection among these three active alternatives should be based on:

Product availability and lead time requirements
Inventory levels: 0315002.MXP (972 Pcs), 0315002.VXP (784 Pcs), 0315002.HXP (741 Pcs)
Regulatory compliance: All three parts carry CE, CSA, PSE, and UL certifications, meeting or exceeding the original part's approval requirements
Dimensional tolerance: Littelfuse parts exhibit minor dimensional variations (0.275" Dia vs. 0.272" Dia; 1.275" L vs. 1.280" L) within standard mechanical tolerances for through-hole fuse holders

No circuit redesign or thermal analysis is required when substituting any of these three parts for the 3SBP 2-R.

Frequently Asked Questions (FAQ)

Q: Can 0315002.HXP, 0315002.MXP, and 0315002.VXP be used interchangeably with 3SBP 2-R?

A: Yes. All three Littelfuse parts are electrically and mechanically equivalent. They share identical current ratings (2A), voltage ratings (250V AC), fuse type (cartridge glass), response time (slow blow), package format (3AB/3AG), and operating temperature range (-55°C to 125°C).

Q: What are the differences between the three Littelfuse substitute parts?

A: The three parts (0315002.HXP, 0315002.MXP, 0315002.VXP) are electrically and mechanically identical. Differences exist only in inventory availability and internal manufacturing variants. Selection can be based on stock levels and procurement lead times.

Q: Are there dimensional compatibility concerns when substituting these parts?

A: Littelfuse parts have minor dimensional variations: 0.275" diameter versus the original 0.272", and 1.275" length versus 1.280". These variations fall within standard mechanical tolerances for 3AB/3AG through-hole fuse holders and do not affect functional compatibility.

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

A: The Littelfuse parts carry CE, CSA, PSE, and UL certifications. The original 3SBP 2-R carried CE, CSA, cULus, and PSE certifications. The substitute parts meet or exceed the original certification requirements.

Q: What is the significance of the different breaking capacity ratings?

A: The original 3SBP 2-R has a breaking capacity of 200A, while the Littelfuse substitutes have 100A. Both ratings exceed typical circuit protection requirements for 2A fuses. Selection should be based on specific system fault current levels if breaking capacity is a design constraint.

Q: Are there resistance differences that affect circuit performance?

A: DC cold resistance differs slightly: 0.12 Ohms (original) versus 0.1169 Ohms (substitutes). This negligible difference (less than 3%) does not impact circuit performance in standard applications.

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