Equivalent & Substitute Parts for 5ST 4 Glass Cartridge Fuse

Part Overview

The Bel Fuse Inc. 5ST 4 is a 4A 250VAC slow-blow glass cartridge fuse in 5mm x 20mm form factor, designed for circuits requiring holder-mounted protection. This part is classified as obsolete. Equivalent and substitute parts are necessary to maintain circuit protection functionality in applications where the original 5ST 4 is no longer available or where alternative manufacturers' products offer active production status and enhanced compliance certifications.

Substiute Parts

5ST 4

Bel Fuse Inc.In Stock: 7375ST 4 Datasheet

Current PartRFQ

5ST 4-R

Bel Fuse Inc.In Stock: 311325ST 4-R Datasheet

DirectRFQ

5ET 4-R

Bel Fuse Inc.In Stock: 41085ET 4-R Datasheet

Parametric EquivalentRFQ

0218004.MXBP

Littelfuse Inc.In Stock: 7540218004.MXBP Datasheet

DirectRFQ

0218004.MXP

Littelfuse Inc.In Stock: 224390218004.MXP Datasheet

DirectRFQ

0218004.VXP

Littelfuse Inc.In Stock: 10180218004.VXP Datasheet

DirectRFQ

0034.3123

SCHURTER Inc.In Stock: 582650034.3123 Datasheet

SimilarRFQ

0213004.MXP

Littelfuse Inc.In Stock: 56030213004.MXP Datasheet

SimilarRFQ

0213004.TXP

Littelfuse Inc.In Stock: 8620213004.TXP Datasheet

SimilarRFQ

0218004.HXP

Littelfuse Inc.In Stock: 53680218004.HXP Datasheet

SimilarRFQ

0218004.MXF11P

Littelfuse Inc.In Stock: 11030218004.MXF11P Datasheet

SimilarRFQ

0218004.TXP

Littelfuse Inc.In Stock: 10890218004.TXP Datasheet

SimilarRFQ

GDC-4A

Eaton - Electronics DivisionIn Stock: 1129GDC-4A Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence in the following parameters:

• Current Rating: 4 A (mandatory match)
• Voltage Rating (AC): 250 V (mandatory match)
• Package / Case: 5mm x 20mm (mandatory match)
• Fuse Type: Cartridge, Glass (mandatory match)
• Response Time: Slow Blow (mandatory match)
• Mounting Type: Requires Holder (mandatory match)
• Operating Temperature Range: -55°C ~ 125°C (mandatory match)

Parts are grouped into two categories:

Direct Equivalents: Parts with identical electrical and mechanical specifications, differing only in manufacturer, series designation, or packaging format. These include 5ST 4-R (Bel Fuse, active status), 0218004.MXP, 0218004.VXP, and 0218004.HXP (Littelfuse).

Parametric Equivalents: Parts meeting all mandatory parameters but with variations in secondary characteristics such as breaking capacity or melting I²t. The 5ET 4-R (Bel Fuse) exhibits higher breaking capacity (150A vs. 40A) and melting I²t (300 vs. 56), while maintaining all core electrical and mechanical specifications.

Similar Parts: Parts from alternative manufacturers (SCHURTER, Littelfuse series 213) that meet all mandatory parameters with minor dimensional or resistance variations within acceptable engineering tolerances.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: 5ST 4-R (Bel Fuse Inc.) is the direct equivalent replacement for the obsolete 5ST 4. It maintains identical electrical and mechanical specifications while offering active production status and ROHS3 compliance. This part is suitable for direct substitution without circuit redesign.

Alternative from Same Manufacturer: 5ET 4-R (Bel Fuse Inc.) provides enhanced breaking capacity (150A vs. 40A) and higher melting I²t (300 vs. 56) while maintaining all core electrical parameters. Selection of this part is appropriate for applications requiring higher fault current withstand capability.

Cross-Manufacturer Alternatives: Littelfuse 0218004 series (MXP, VXP, HXP, MXBP, MXF11P) and SCHURTER 0034.3123 are functionally equivalent to the original 5ST 4. All are active production parts with ROHS3 compliance. Littelfuse 0213004 series (MXP, TXP) offer higher melting I²t values (226.505) and may be selected where thermal response characteristics require adjustment.

Compliance Consideration: The original 5ST 4 is RoHS non-compliant. All substitute parts listed are ROHS3 compliant, meeting current regulatory requirements for new designs and production.

Frequently Asked Questions (FAQ)

Q: Can 5ST 4-R be used as a direct replacement for the obsolete 5ST 4?

A: Yes. The 5ST 4-R is electrically and mechanically identical to the 5ST 4, differing only in production status (active vs. obsolete) and RoHS compliance. No circuit modifications are required.

Q: What is the difference between 5ST 4-R and 5ET 4-R?

A: Both maintain 4A current rating and 250V voltage rating in 5x20mm form factor. The 5ET 4-R has higher breaking capacity (150A vs. 40A) and higher melting I²t (300 vs. 56). Selection depends on the fault current levels present in the application circuit.

Q: Are Littelfuse and SCHURTER parts interchangeable with Bel Fuse parts?

A: Yes, for applications where the core electrical parameters (4A, 250V, 5x20mm, slow-blow response) are the requirements. All listed parts meet these specifications. Dimensional variations are within acceptable tolerances for standard fuse holders.

Q: Why do some Littelfuse parts have different melting I²t values?

A: Melting I²t is a secondary characteristic that affects thermal response time. The 0213004 series (I²t = 226.505) has slower thermal response than the 0218004 series (I²t = 69.1). Selection should match the thermal protection requirements of the specific circuit.

Q: Is packaging format important when selecting a substitute?

A: Yes. All listed parts require a fuse holder for mounting. The 5x20mm form factor is standardized across all substitutes. Verify that the existing fuse holder is compatible with the selected replacement part.

Q: What certifications should I verify for new designs?

A: All substitute parts listed carry multiple approval agencies (CE, CSA, VDE, UL, PSE, CCC). Verify that the specific certifications required by your application and target market are present on the selected part's datasheet.