3SBP 250-R Equivalent & Substitute Parts

Part Overview

The 3SBP 250-R is a 250 mA, 250 V AC/DC slow-blow glass cartridge fuse manufactured by Bel Fuse Inc. in the 3AB/3AG form factor (1/4" x 1-1/4" axial). This part is classified as obsolete, making equivalent substitutes necessary for ongoing system maintenance and new designs. Active alternatives from Littelfuse maintain identical electrical and mechanical specifications, ensuring direct functional replacement in through-hole applications.

Substiute Parts

3SBP 250-R

Bel Fuse Inc.In Stock: 8883SBP 250-R Datasheet

Current PartRFQ

0315.250HXP

LittelfuseIn Stock: 12350315.250HXP Datasheet

DirectRFQ

0315.250MXP

Littelfuse Inc.In Stock: 8130315.250MXP Datasheet

DirectRFQ

0315.250VXP

LittelfuseIn Stock: 10370315.250VXP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 3SBP 250-R is determined by strict equivalence across the following parameters:

• Current Rating: 250 mA (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)
• 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 Littelfuse alternatives (0315.250HXP, 0315.250MXP, 0315.250VXP) meet these criteria and are classified as active products with current manufacturing support.

Parameter Comparison

Engineering Selection Recommendations

The 3SBP 250-R is obsolete and no longer manufactured. All three Littelfuse alternatives (0315.250HXP, 0315.250MXP, 0315.250VXP) are active products with equivalent electrical and mechanical specifications. Selection among the three Littelfuse options is interchangeable from a functional standpoint, as they share identical current ratings, voltage ratings, response characteristics, and package dimensions.

All substitute parts maintain ROHS3 compliance and hold CE, CSA, and UL certifications, meeting the regulatory requirements of the original part. The minor dimensional variations (0.003" diameter and 0.005" length differences) and DC cold resistance differences (4.27 Ohms vs. 5.6 Ohms) fall within acceptable tolerances for cartridge fuse applications and do not affect functional compatibility in standard circuit protection applications.

Frequently Asked Questions (FAQ)

Q: Can the Littelfuse 0315.250HXP, 0315.250MXP, or 0315.250VXP be used as direct replacements for the 3SBP 250-R?

A: Yes. All three Littelfuse parts are direct functional equivalents. They share identical current ratings (250 mA), voltage ratings (250 V AC), response time (slow blow), package form factor (3AB/3AG, 1/4" x 1-1/4" axial), and mounting type (through hole). They are physically compatible with existing PCB footprints and circuit designs.

Q: What is the difference between the three Littelfuse substitute options?

A: The 0315.250HXP, 0315.250MXP, and 0315.250VXP are functionally identical in terms of electrical performance and mechanical compatibility. All three are active products from Littelfuse with equivalent specifications. Selection can be based on availability or packaging preferences (all listed as bulk packaging).

Q: Are there any compliance or certification differences?

A: The original 3SBP 250-R carries CE, CSA, and cULus certifications. The Littelfuse substitutes carry CE, CSA, and UL certifications. Both certification sets meet standard industrial and consumer protection requirements. All parts are ROHS3 compliant.

Q: Will the dimensional differences affect PCB compatibility?

A: The dimensional variations between the 3SBP 250-R (0.272" Dia x 1.280" L) and Littelfuse substitutes (0.275" Dia x 1.275" L) are within standard manufacturing tolerances for cartridge fuses. These minor differences do not affect mechanical fit in standard 3AG fuse holders or through-hole PCB designs.

Q: What is the significance of the DC cold resistance difference?

A: The 3SBP 250-R has a DC cold resistance of 5.6 Ohms, while the Littelfuse substitutes measure 4.27 Ohms. This difference is within acceptable limits for slow-blow cartridge fuses and does not impact circuit protection performance in standard applications.