Equivalent & Substitute Parts for 3SB 375-R

Part Overview

The 3SB 375-R is a 375 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 equivalent substitute parts necessary for ongoing system maintenance and new designs requiring this electrical specification.

Substiute Parts

3SB 375-R

Bel Fuse Inc.In Stock: 9933SB 375-R Datasheet

Current PartRFQ

0313.375HXP

Littelfuse Inc.In Stock: 10580313.375HXP Datasheet

DirectRFQ

0313.375MXP

LittelfuseIn Stock: 37180313.375MXP Datasheet

DirectRFQ

0313.375VXP

Littelfuse Inc.In Stock: 7030313.375VXP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 3SB 375-R are qualified based on the following electrical and mechanical parameters:

• Current Rating: 375 mA (exact match required)
• Voltage Rating: 250 V AC (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" (exact match required)
• Mounting Type: Requires Holder (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)

All substitute parts listed below meet these criteria and are manufactured by Littelfuse Inc., an active manufacturer with current product availability.

Parameter Comparison

Engineering Selection Recommendations

All three Littelfuse substitute parts (0313.375HXP, 0313.375MXP, 0313.375VXP) are direct functional equivalents to the 3SB 375-R. Selection among these active alternatives should be based on:

• Product availability and inventory levels
• Packaging requirements (all are supplied in bulk)
• Compliance certifications: All substitutes carry CE, CSA, and UL approvals, meeting the regulatory requirements of the original part
• RoHS3 compliance is maintained across all options

The transition from the obsolete 3SB 375-R to any of these Littelfuse equivalents presents no electrical or mechanical incompatibility within the specified operating parameters.

Frequently Asked Questions (FAQ)

Q: Can the Littelfuse 0313.375HXP, 0313.375MXP, or 0313.375VXP be used as direct replacements for the 3SB 375-R?

A: Yes. All three Littelfuse parts match the required electrical specifications (375 mA, 250 V AC, slow-blow response) and mechanical package (3AB, 3AG, 1/4" x 1-1/4"). They are compatible with the same holder and mounting configuration.

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

A: The three Littelfuse parts (0313.375HXP, 0313.375MXP, 0313.375VXP) are electrically and mechanically identical. They differ only in internal manufacturing variants and packaging batch designations. All meet the same performance and compliance requirements.

Q: Are there any compliance or certification differences between the original and substitute parts?

A: The original 3SB 375-R carries CE, CSA, and cULus approvals. The Littelfuse substitutes carry CE, CSA, and UL approvals. Both certification sets satisfy industrial and commercial safety standards for this fuse category.

Q: What are the physical dimension tolerances between the original and substitutes?

A: The original part measures 0.250" Dia x 1.252" L, while the Littelfuse substitutes measure 0.250" Dia x 1.250" L. Both dimensions fall within the 3AB, 3AG standard package specification and are compatible with standard 1/4" x 1-1/4" fuse holders.

Q: Is the DC cold resistance specification critical for substitution?

A: DC cold resistance values are provided for reference but do not affect functional substitution. The original part specifies 2.5 Ohms, while Littelfuse substitutes specify 2.095 Ohms. Both values are within acceptable operating parameters for this fuse category.