3SBP 2 Equivalent & Substitute Parts

Part Overview

The 3SBP 2 is a 2 A 250 V AC/DC slow-blow glass cartridge fuse with 3AB/3AG package configuration, manufactured by Bel Fuse Inc. This component is classified as obsolete, making substitute parts necessary for ongoing system maintenance and new designs. The fuse is designed for through-hole mounting in 1/4" x 1-1/4" (6.90mm x 32.50mm) form factor applications requiring circuit protection at 250 V AC with slow-blow response characteristics.

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
Breaking Capacity @ Rated Voltage	100 A
Melting I²t	61

Substitute Part Grouping Explanation

Substitution for the 3SBP 2 is determined by strict equivalence across the following critical parameters:

Current Rating: 2 A (exact match required)
Voltage Rating (AC): 250 V (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 (minimum required)

All substitute parts listed meet these criteria. Variations in breaking capacity, melting I²t, DC cold resistance, and RoHS compliance status do not disqualify substitution but are noted for engineering selection purposes.

Parameter Comparison

Part Number	Manufacturer	Current Rating (A)	Voltage Rating (V AC)	Response Time	Package / Case	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ohms)	Product Status	RoHS Status
3SBP 2	Bel Fuse Inc.	2	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	100	61	0.16	Obsolete	RoHS non-compliant
3SBP 2-R	Bel Fuse Inc.	2	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	200	61	0.12	Obsolete	ROHS3 Compliant
0315002.HXP	Littelfuse Inc.	2	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	100	77	0.1169	Active	ROHS3 Compliant
0315002.MXP	Littelfuse Inc.	2	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	100	77	0.1169	Active	ROHS3 Compliant
0315002.VXP	Littelfuse Inc.	2	250	Slow Blow	3AB, 3AG, 1/4" x 1-1/4"	100	77	0.1169	Active	ROHS3 Compliant

Engineering Selection Recommendations

For applications requiring the 3SBP 2, the following selection criteria apply:

Active Product Status Priority: The Littelfuse 315 series parts (0315002.HXP, 0315002.MXP, 0315002.VXP) are classified as active products and represent the primary substitution path. These parts provide ongoing manufacturer support and availability.

RoHS Compliance: If RoHS3 compliance is required for new designs or regulatory adherence, select from the Littelfuse 315 series or the 3SBP 2-R. The original 3SBP 2 is RoHS non-compliant.

Bel Fuse Inc. Continuity: The 3SBP 2-R maintains manufacturer continuity with Bel Fuse Inc. while providing ROHS3 compliance and improved breaking capacity (200 A vs. 100 A).

Littelfuse 315 Series Variants: The 0315002.HXP, 0315002.MXP, and 0315002.VXP are functionally equivalent with identical electrical specifications. Selection between these variants depends on packaging requirements and internal design differences not specified in the provided parameters.

All substitute parts maintain the same current rating, voltage rating, response time, and physical package configuration as the original 3SBP 2.

Frequently Asked Questions (FAQ)

Q: Can the 3SBP 2 be directly replaced with any of the listed substitutes?

A: Yes. All listed substitute parts meet the critical substitution parameters: 2 A current rating, 250 V AC voltage rating, slow-blow response, 3AB/3AG package, and through-hole mounting. Physical dimensions and electrical characteristics are equivalent within engineering tolerances.

Q: What is the difference between the Littelfuse 315 series variants (0315002.HXP, 0315002.MXP, 0315002.VXP)?

A: These three parts are electrically and mechanically identical based on the provided parameters. Differences exist in internal design or packaging specifications not included in this reference. Consult manufacturer datasheets for variant-specific details.

Q: Should I use the 3SBP 2-R or the Littelfuse 315 series?

A: The Littelfuse 315 series parts are active products with ongoing manufacturer support. The 3SBP 2-R is also obsolete. For new designs, the Littelfuse 315 series is preferred. For legacy system maintenance where Bel Fuse Inc. continuity is required, the 3SBP 2-R is available.

Q: Does the higher breaking capacity of the 3SBP 2-R (200 A vs. 100 A) affect compatibility?

A: No. Higher breaking capacity does not affect substitution compatibility. The 3SBP 2-R maintains all other critical parameters identical to the 3SBP 2 and is a direct substitute.

Q: Are all substitute parts RoHS3 compliant?

A: The Littelfuse 315 series (0315002.HXP, 0315002.MXP, 0315002.VXP) and the 3SBP 2-R are ROHS3 compliant. The original 3SBP 2 is RoHS non-compliant.

Q: What is the significance of the different melting I²t values?

A: The melting I²t value characterizes the thermal energy required to melt the fuse element. The 3SBP 2 has a melting I²t of 61, while the Littelfuse 315 series has 77. Both values are within the slow-blow fuse classification and do not disqualify substitution for the specified 2 A, 250 V AC application.

Q: Can I use these fuses in DC applications?

A: The 3SBP 2 is rated for 250 V AC/DC operation. All substitute parts maintain this dual-voltage capability. However, fuse selection for DC circuits requires additional consideration of DC breaking capacity, which is not specified in this reference.

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