3SBP 10 Equivalent & Substitute Parts

Part Overview

The 3SBP 10 is a 10 A 125 V AC DC glass cartridge fuse manufactured by Bel Fuse Inc. with 3AB, 3AG form factor and slow-blow response characteristics. This part is classified as obsolete, making substitute components necessary for ongoing system maintenance and new designs. Equivalent and substitute parts maintain the same electrical ratings, mechanical dimensions, and functional performance while offering improved availability and compliance status.

Key Parameters

Parameter	Value
Current Rating	10 A
Voltage Rating (AC)	125 V
Fuse Type	Cartridge, Glass
Package / Case	3AB, 3AG, 1/4" x 1-1/4" (Axial)
Response Time	Slow Blow
Mounting Type	Through Hole
Breaking Capacity @ Rated Voltage	10 kA
Melting I²t	817
Operating Temperature Range	-55°C ~ 125°C
DC Cold Resistance	0.01 Ohms

Substitute Part Grouping Explanation

Substitution of the 3SBP 10 is determined by the following critical parameters:

Primary Substitution Criteria:

Current Rating: 10 A (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (Axial) (exact match required)
Response Time: Slow Blow (exact match required)
Mounting Type: Through Hole (exact match required)
Operating Temperature Range: -55°C ~ 125°C (exact match required)

Secondary Substitution Criteria:

Voltage Rating (AC): Substitute parts may operate at different voltage ratings provided the application circuit voltage does not exceed the substitute part's rating
Breaking Capacity: Substitute parts may have different breaking capacity values
Melting I²t: Substitute parts may have different melting I²t values within acceptable tolerance
RoHS and Compliance Status: Active product status and improved compliance are preferred

The 3SBP 10-R (Bel Fuse Inc.) is a direct equivalent with identical electrical and mechanical specifications. Littelfuse Inc. 315 series parts (0315010.HXP, 0315010.MX250P, 0315010.MXP, 0315010.VXP) are functionally compatible substitutes with matching current rating, form factor, and response characteristics, though voltage ratings vary by model.

Parameter Comparison

Parameter	3SBP 10	3SBP 10-R	0315010.HXP	0315010.MX250P	0315010.MXP	0315010.VXP
Manufacturer	Bel Fuse Inc.	Bel Fuse Inc.	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.
Current Rating (A)	10	10	10	10	10	10
Voltage Rating (AC)	125 V	125 V	32 V	250 V	32 V	32 V
Fuse Type	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass
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"	3AB, 3AG, 1/4" x 1-1/4"	3AB, 3AG, 1/4" x 1-1/4"
Response Time	Slow Blow	Slow Blow	Slow Blow	Slow Blow	Slow Blow	Slow Blow
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Breaking Capacity @ Rated Voltage	10 kA	10 kA	300 A	35 A	300 A	300 A
Melting I²t	817	817	760	760	760	760
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
DC Cold Resistance	0.01 Ω	0.01 Ω	0.0083 Ω	0.0083 Ω	0.0083 Ω	0.0083 Ω
Product Status	Obsolete	Obsolete	Active	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Approval Agency	CE, CSA, PSE, UL	CE, CSA, cULus, PSE	UL	CE, CSA, PSE, UL	UL	CE, CSA, PSE, UL

Engineering Selection Recommendations

Direct Equivalent (Recommended for 125 V AC Applications):

The 3SBP 10-R is the primary substitute for the 3SBP 10. Both parts are manufactured by Bel Fuse Inc., share identical electrical and mechanical specifications, and maintain the same 10 A / 125 V AC rating. The 3SBP 10-R offers improved compliance status (ROHS3 Compliant) and active product support, making it the preferred choice for direct replacement in 125 V AC circuits.

Littelfuse 315 Series Alternatives (Application-Dependent):

Littelfuse Inc. 315 series parts provide functional substitutes with matching current rating, form factor, and response characteristics. Selection depends on circuit voltage requirements:

0315010.MX250P: Suitable for applications operating at 250 V AC. Offers the highest voltage rating among available substitutes and maintains CE, CSA, PSE, and UL certifications.
0315010.HXP, 0315010.MXP, 0315010.VXP: Suitable for applications operating at 32 V AC or lower. These parts are functionally interchangeable with each other. The 0315010.VXP offers the broadest certification coverage (CE, CSA, PSE, UL) compared to 0315010.HXP and 0315010.MXP (UL only).

All Littelfuse substitutes are ROHS3 Compliant and carry Active product status, ensuring long-term availability and supply chain stability.

Voltage Rating Consideration:

Substitute parts must not be used in circuits exceeding their rated voltage. For 125 V AC applications, only the 3SBP 10-R provides exact voltage matching. The 0315010.MX250P is suitable for 125 V AC circuits due to its 250 V rating. The 32 V rated Littelfuse parts (0315010.HXP, 0315010.MXP, 0315010.VXP) are not suitable for 125 V AC applications.

Frequently Asked Questions (FAQ)

Q: Can I use a 32 V rated fuse in a 125 V AC circuit?

A: No. Fuses must be rated for the circuit voltage or higher. Using a 32 V fuse in a 125 V AC circuit violates electrical safety standards and creates a hazard. Select only parts rated for 125 V AC or higher.

Q: What is the difference between 3SBP 10 and 3SBP 10-R?

A: Both parts are electrically and mechanically identical with 10 A / 125 V AC ratings and slow-blow response. The primary difference is product status and compliance: 3SBP 10-R is ROHS3 Compliant and carries Active status, while 3SBP 10 is Obsolete and RoHS non-compliant. The 3SBP 10-R is the recommended replacement.

Q: Are all substitute parts mechanically interchangeable?

A: Yes. All listed substitute parts share the identical 3AB, 3AG form factor with 1/4" x 1-1/4" (Axial) dimensions and through-hole mounting. Physical installation is identical across all parts.

Q: What does "Slow Blow" response mean?

A: Slow-blow fuses tolerate temporary current surges and inrush currents without nuisance operation. They open only under sustained overcurrent conditions. All listed parts maintain this characteristic, ensuring consistent circuit protection behavior.

Q: Why do substitute parts have different melting I²t values?

A: Melting I²t represents the thermal energy required to melt the fuse element. Littelfuse 315 series parts (I²t = 760) have slightly lower values than the original 3SBP 10 (I²t = 817). This difference reflects manufacturing variations between manufacturers but does not affect functional compatibility for the specified 10 A current rating and slow-blow response.

Q: Which substitute should I choose for a new design?

A: For 125 V AC applications, use 3SBP 10-R or 0315010.MX250P. Both are ROHS3 Compliant with Active status. The 3SBP 10-R provides exact voltage matching; the 0315010.MX250P offers higher voltage margin. For applications below 32 V AC, any of the 32 V rated Littelfuse parts (0315010.HXP, 0315010.MXP, 0315010.VXP) are suitable, with 0315010.VXP offering the broadest certification coverage.

Q: Are these parts certified for international use?

A: Certification varies by part. The 3SBP 10-R carries CE, CSA, cULus, and PSE approvals. The 0315010.MX250P and 0315010.VXP carry CE, CSA, PSE, and UL approvals. The 0315010.HXP and 0315010.MXP carry UL approval only. Verify certifications match your regional requirements before selection.

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