3SB 100-R Equivalent & Substitute Parts

Part Overview

The 3SB 100-R is a 100 mA, 250 V AC/DC glass cartridge fuse manufactured by Bel Fuse Inc. with a slow blow response time. This component is classified as obsolete, making identification of active equivalent parts essential for ongoing system maintenance and new design implementations. The 3AB and 3AG package format with 1/4" x 1-1/4" dimensions requires a compatible holder for installation. Substitute parts must maintain identical electrical ratings and mechanical compatibility to ensure proper circuit protection without modification to existing fuse holders.

Substiute Parts

3SB 100-R

Bel Fuse Inc.In Stock: 9673SB 100-R Datasheet

Current PartRFQ

0313.100MXP

LittelfuseIn Stock: 24110313.100MXP Datasheet

DirectRFQ

0313.100VXP

Littelfuse Inc.In Stock: 8810313.100VXP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 3SB 100-R is based on strict equivalence of electrical and mechanical parameters. The following criteria determine valid substitutes:

• Current Rating: Must be 100 mA
• Voltage Rating (AC): Must be 250 V
• Fuse Type: Must be Cartridge, Glass
• Response Time: Must be Slow Blow
• Package / Case: Must be 3AB, 3AG, 1/4" x 1-1/4"
• Mounting Type: Must require the same holder configuration
• Operating Temperature Range: Must support -55°C ~ 125°C

Both identified substitute parts meet these criteria and are manufactured by Littelfuse Inc., with active product status and full regulatory compliance.

Parameter Comparison

Engineering Selection Recommendations

Both 0313.100MXP and 0313.100VXP from Littelfuse Inc. are direct functional equivalents to the 3SB 100-R. Selection between these two active alternatives should be based on availability and packaging requirements:

• 0313.100MXP: 2372 units in stock, bulk packaging
• 0313.100VXP: 776 units in stock, bulk packaging

Both parts carry identical electrical specifications, mechanical compatibility, and regulatory certifications (CE, CSA, UL). The transition from the obsolete 3SB 100-R to either Littelfuse equivalent requires no circuit modifications or holder changes, as dimensional and functional parameters are maintained.

Frequently Asked Questions (FAQ)

Q: Can 0313.100MXP and 0313.100VXP be used interchangeably with the 3SB 100-R?

A: Yes. Both Littelfuse parts meet all electrical and mechanical requirements for direct substitution. They share identical current ratings, voltage ratings, response times, and package dimensions.

Q: Will the substitute parts fit existing 3AB and 3AG fuse holders?

A: Yes. Both substitute parts maintain the 1/4" x 1-1/4" (6.35mm x 31.80mm) package dimensions and are designed for the same holder configuration.

Q: What is the difference between 0313.100MXP and 0313.100VXP?

A: Both parts are electrically and mechanically identical. Differences exist only in DC cold resistance (43 Ohms for both) and breaking capacity specifications (35A for both), which are equivalent. Selection should be based on inventory availability.

Q: Are the substitute parts RoHS compliant?

A: Yes. Both 0313.100MXP and 0313.100VXP are ROHS3 compliant and carry the same regulatory certifications as the original part.

Q: Can these fuses be used in applications outside the -55°C ~ 125°C temperature range?

A: No. All three parts, including substitutes, are rated for operation within -55°C ~ 125°C. Applications requiring different temperature ranges require alternative component selection.