5SF 400 Equivalent & Substitute Parts

Part Overview

The 5SF 400 is a 400 mA, 250 V AC/DC fast-blow glass cartridge fuse in 5mm x 20mm form factor manufactured by Bel Fuse Inc. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing system maintenance and new design implementations. Substitute parts must maintain identical electrical ratings, mechanical dimensions, and functional characteristics to ensure direct compatibility in existing fuse holder assemblies.

Substiute Parts

5SF 400

Bel Fuse Inc.In Stock: 9935SF 400 Datasheet

Current PartRFQ

0034.1512

SCHURTER Inc.In Stock: 19800034.1512 Datasheet

DirectRFQ

0217.400MXP

Littelfuse Inc.In Stock: 16670217.400MXP Datasheet

DirectRFQ

0217.400TXP

Littelfuse Inc.In Stock: 8860217.400TXP Datasheet

DirectRFQ

0217.400VXP

Littelfuse Inc.In Stock: 7820217.400VXP Datasheet

DirectRFQ

0217.400HXP

Littelfuse Inc.In Stock: 20070217.400HXP Datasheet

SimilarRFQ

GDB-400MA

Eaton - Electronics DivisionIn Stock: 806GDB-400MA Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 5SF 400 is determined by strict compliance with the following parameters:

• Current Rating: 400 mA (exact match required)
• Voltage Rating: 250 V AC (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Response Time: Fast Blow (exact match required)
• Package / Case: 5mm x 20mm (exact match required)
• Breaking Capacity: 35A (exact match required)
• Operating Temperature: -55°C ~ 125°C (exact match or wider range acceptable)

All substitute parts listed below meet these mandatory criteria. Dimensional tolerances (0.201" to 0.205" diameter and 0.787" length) fall within acceptable mechanical compatibility ranges for standard 5x20mm fuse holders.

Parameter Comparison

Engineering Selection Recommendations

All substitute parts maintain active product status with the exception of the original 5SF 400, which is obsolete. Selection should prioritize parts with the highest compliance certifications and RoHS3 compliance status for new designs and long-term availability.

Littelfuse 0217.400MXP, 0217.400TXP, 0217.400VXP, and 0217.400HXP offer the broadest approval agency coverage (CCC, CE, CSA, K-MARK, SEMKO, UL, VDE) and full RoHS3 compliance. SCHURTER 0034.1512 provides an alternative with active status and RoHS3 compliance, though with fewer approval agencies listed. Eaton GDB-400MA maintains active status but lacks specified RoHS compliance documentation.

For applications requiring specific regulatory certifications, cross-reference the approval agency requirements against the certification list provided for each substitute part.

Frequently Asked Questions (FAQ)

Q: Can I use any of these substitute parts directly in place of the 5SF 400?

A: Yes. All listed substitute parts meet the mandatory electrical and mechanical parameters: 400 mA current rating, 250 V AC voltage rating, fast-blow response, 35A breaking capacity, and 5mm x 20mm package dimensions. They are mechanically and electrically compatible with standard 5x20mm fuse holders.

Q: What is the difference between the Littelfuse variants (0217.400MXP, 0217.400TXP, 0217.400VXP, 0217.400HXP)?

A: All four Littelfuse variants share identical electrical ratings and certifications. Differences exist only in melting I²t values (all 0.125) and DC cold resistance (0.277 or 0.2777 Ohms). These variants are interchangeable for standard 400 mA, 250 V applications.

Q: Why does the original 5SF 400 show as obsolete?

A: The 5SF 400 is classified as obsolete by the manufacturer, indicating it is no longer in active production. Substitute parts from active manufacturers ensure continued availability and support for system maintenance and new implementations.

Q: Are there differences in melting I²t values between substitute parts?

A: Yes. Melting I²t values range from 0.085 (SCHURTER 0034.1512) to 0.18 (Eaton GDB-400MA). These variations reflect different thermal characteristics but do not affect substitution eligibility, as all parts meet the 35A breaking capacity requirement at rated voltage.

Q: Which substitute part has the best RoHS compliance?

A: Littelfuse 0217.400MXP, 0217.400TXP, 0217.400VXP, and 0217.400HXP all carry ROHS3 Compliant status. SCHURTER 0034.1512 also carries ROHS3 Compliant status. Eaton GDB-400MA does not specify RoHS compliance status.

Q: What approval agencies are most commonly required?

A: UL, CE, and VDE certifications are present across most substitute parts. Littelfuse variants include the broadest certification coverage, including CCC, K-MARK, and SEMKO in addition to UL, CE, CSA, and VDE.