3SBP 7 Glass Cartridge Fuse - Equivalent & Substitute Parts

Part Overview

The 3SBP 7 is a 7 A, 250 V AC/DC slow-blow glass cartridge fuse manufactured by Bel Fuse Inc. in the 3AB/3AG package format (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. Direct replacements are available from both the original manufacturer and qualified alternative suppliers that meet identical electrical and mechanical specifications.

Key Parameters

Parameter	Value
Current Rating	7 A
Voltage Rating (AC)	250 V
Response Time	Slow Blow
Package / Case	3AB, 3AG, 1/4" x 1-1/4" (Axial)
Fuse Type	Cartridge, Glass
Breaking Capacity @ Rated Voltage	200 A
Operating Temperature Range	-55°C ~ 125°C
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution eligibility for the 3SBP 7 is determined by strict equivalence across the following critical parameters:

Current Rating: 7 A (exact match required)
Voltage Rating: 250 V AC (exact match required)
Response Time: Slow Blow (exact match required)
Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (Axial) (exact match required)
Breaking Capacity: 200 A (exact match required)
Operating Temperature Range: -55°C ~ 125°C (exact match required)

All substitute parts listed below meet these criteria. Dimensional tolerances and electrical characteristics (melting I²t, DC cold resistance) remain within acceptable engineering margins for direct substitution in existing circuit designs.

Parameter Comparison

Parameter	3SBP 7	3SBP 7-R	0315007.HXP	0315007.MXP	0315007.VXP
Manufacturer	Bel Fuse Inc.	Bel Fuse Inc.	Littelfuse	Littelfuse Inc.	Littelfuse Inc.
Current Rating (Amps)	7 A	7 A	7 A	7 A	7 A
Voltage Rating - AC	250 V	250 V	250 V	250 V	250 V
Response Time	Slow Blow	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"	3AB, 3AG, 1/4" x 1-1/4"
Breaking Capacity @ Rated Voltage	200 A	200 A	200 A	200 A	200 A
Melting I²t	372	372	347	347	347
DC Cold Resistance (Ohms)	0.016	0.016	0.0128	0.0128	0.0128
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Product Status	Obsolete	Obsolete	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Approval Agency	CE, CSA, PSE, UL	CE, CSA, cULus, PSE	CE, CSA, K-MARK, PSE, UL	CE, CSA, K-MARK, PSE, UL	CE, CSA, KC, PSE, UL

Engineering Selection Recommendations

For applications requiring the 3SBP 7, the following selection hierarchy applies:

Primary Substitutes (Active Status, RoHS3 Compliant):

0315007.HXP (Littelfuse) - Active product status with full regulatory approvals including K-MARK and UL certification
0315007.MXP (Littelfuse Inc.) - Active product status with K-MARK and UL certification
0315007.VXP (Littelfuse Inc.) - Active product status with KC and UL certification

Secondary Substitute (Obsolete Status, RoHS3 Compliant):

3SBP 7-R (Bel Fuse Inc.) - Direct manufacturer variant with improved RoHS3 compliance; product status remains obsolete

The Littelfuse 315 series parts (0315007.HXP, 0315007.MXP, 0315007.VXP) are recommended for new designs and long-term supply continuity due to active product status and comprehensive regulatory certifications. All substitute parts maintain electrical equivalence and mechanical compatibility with the original 3SBP 7 specification.

Frequently Asked Questions (FAQ)

Q: Can the 0315007.HXP, 0315007.MXP, and 0315007.VXP be used interchangeably with the 3SBP 7?

A: Yes. All three Littelfuse parts meet the identical electrical and mechanical specifications: 7 A, 250 V AC, slow-blow response, 3AB/3AG package, and 200 A breaking capacity. They are direct functional equivalents.

Q: What is the difference between 0315007.HXP, 0315007.MXP, and 0315007.VXP?

A: These three parts are electrically and mechanically identical. The suffix designations (HXP, MXP, VXP) reflect different regulatory approval combinations. Selection depends on regional certification requirements: 0315007.HXP includes K-MARK, 0315007.MXP includes K-MARK, and 0315007.VXP includes KC certification.

Q: Why is the 3SBP 7 marked as obsolete?

A: The original 3SBP 7 is no longer in active production. The 3SBP 7-R variant and Littelfuse 315 series equivalents provide continued availability and improved compliance standards.

Q: Are there dimensional differences between the 3SBP 7 and substitute parts?

A: Dimensional specifications are equivalent within standard manufacturing tolerances. The 3SBP 7 and 3SBP 7-R are specified at 0.272" Dia x 1.280" L, while Littelfuse parts are specified at 0.275" Dia x 1.275" L. These variations fall within acceptable mechanical tolerances for 3AB/3AG package compatibility.

Q: What is the significance of the melting I²t and DC cold resistance differences?

A: The 3SBP 7 and 3SBP 7-R have melting I²t values of 372, while Littelfuse parts are rated at 347. The 3SBP 7 has DC cold resistance of 0.016 Ohms versus 0.0128 Ohms for Littelfuse parts. These differences remain within acceptable engineering margins for slow-blow fuse operation and do not affect functional substitution in standard circuit applications.

Q: Which substitute should be selected for new product designs?

A: For new designs, select from the active Littelfuse 315 series (0315007.HXP, 0315007.MXP, or 0315007.VXP) based on required regional certifications. These parts offer long-term supply continuity and RoHS3 compliance.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message