3SBP 7-R Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The 3SBP 7-R is a 7 A, 250 V AC/DC glass cartridge fuse manufactured by Bel Fuse Inc., designed for through-hole mounting in 3AB and 3AG package configurations. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing system maintenance and new design implementations. The fuse provides slow-blow response characteristics with a 200 A breaking capacity at rated voltage, suitable for circuit protection applications requiring moderate current ratings and standard voltage levels.

Substiute Parts

3SBP 7-R

Bel Fuse Inc.In Stock: 20733SBP 7-R Datasheet

Current PartRFQ

0315007.HXP

LittelfuseIn Stock: 8720315007.HXP Datasheet

DirectRFQ

0315007.MXP

Littelfuse Inc.In Stock: 8970315007.MXP Datasheet

DirectRFQ

0315007.VXP

Littelfuse Inc.In Stock: 9240315007.VXP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 3SBP 7-R are qualified based on the following electrical and mechanical parameters:

• Current Rating: 7 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)
• Breaking Capacity @ Rated Voltage: 200 A (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)

All three substitute parts from Littelfuse Inc. (0315007.HXP, 0315007.MXP, 0315007.VXP) meet these criteria and are classified as active products, providing direct functional equivalence to the obsolete 3SBP 7-R.

Parameter Comparison

Engineering Selection Recommendations

All three Littelfuse substitute parts (0315007.HXP, 0315007.MXP, 0315007.VXP) provide direct functional equivalence to the 3SBP 7-R. Selection among these active alternatives should be based on:

• Approval agency requirements for the target application. The 0315007.HXP and 0315007.MXP variants include K-MARK certification, while 0315007.VXP includes KC certification. All three include CE, CSA, PSE, and UL certifications.
• Inventory availability and supply chain considerations. Current stock levels are 846 pcs (0315007.HXP), 815 pcs (0315007.MXP), and 853 pcs (0315007.VXP).
• Minor dimensional and electrical parameter variations. The substitute parts exhibit slightly lower DC cold resistance (0.0128 Ohms vs. 0.016 Ohms) and lower melting I²t values (347 vs. 372), which remain within acceptable tolerance for equivalent circuit protection performance.

Frequently Asked Questions (FAQ)

Q: Can the Littelfuse 0315007 series parts directly replace the obsolete 3SBP 7-R?

A: Yes. The 0315007.HXP, 0315007.MXP, and 0315007.VXP variants are direct functional equivalents. All match the critical electrical parameters (7 A current rating, 250 V AC voltage rating, slow-blow response, 200 A breaking capacity) and mechanical specifications (3AB/3AG package, through-hole mounting, 1/4" x 1-1/4" form factor).

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

A: The three variants are electrically and mechanically identical. The primary differences are regulatory certifications: 0315007.HXP and 0315007.MXP include K-MARK certification, while 0315007.VXP includes KC certification. All include CE, CSA, PSE, and UL approvals. Selection should be based on specific regional compliance requirements.

Q: Are there dimensional compatibility concerns?

A: The substitute parts exhibit minor dimensional variations within the 3AB/3AG package specification. The 3SBP 7-R measures 0.272" diameter x 1.280" length, while the Littelfuse variants measure 0.275" diameter x 1.275" length. These differences remain within standard package tolerances and do not affect through-hole mounting compatibility.

Q: How do the electrical characteristics compare?

A: The substitute parts have lower DC cold resistance (0.0128 Ohms vs. 0.016 Ohms) and lower melting I²t values (347 vs. 372). These variations are minor and do not affect circuit protection performance for the specified 7 A, 250 V application.

Q: Are all substitute parts RoHS compliant?

A: Yes. All three Littelfuse variants (0315007.HXP, 0315007.MXP, 0315007.VXP) are ROHS3 compliant, matching the compliance status of the original 3SBP 7-R.