Bel Fuse Inc. 5ST 80 Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Bel Fuse Inc. 5ST 80 is an 80 mA, 250 V AC/DC slow-blow glass cartridge fuse in a 5mm x 20mm form factor, designed for use with a fuse holder. This part is classified as obsolete. Due to its obsolete status, equivalent substitute parts from active manufacturers are necessary to maintain circuit protection functionality in applications requiring this current and voltage rating. Substitute parts maintain identical electrical specifications and mechanical dimensions to ensure direct compatibility.

Substiute Parts

5ST 80

Bel Fuse Inc.In Stock: 9345ST 80 Datasheet

Current PartRFQ

5ST 80-R

Bel Fuse Inc.In Stock: 54615ST 80-R Datasheet

DirectRFQ

0034.3106

SCHURTER Inc.In Stock: 19240034.3106 Datasheet

DirectRFQ

0218.080MXBP

Littelfuse Inc.In Stock: 10400218.080MXBP Datasheet

DirectRFQ

0218.080MXP

Littelfuse Inc.In Stock: 23080218.080MXP Datasheet

DirectRFQ

0218.080TXP

Littelfuse Inc.In Stock: 7180218.080TXP Datasheet

DirectRFQ

0218.080VXP

Littelfuse Inc.In Stock: 9310218.080VXP Datasheet

DirectRFQ

BK/GDC-80MA

Eaton - Electronics DivisionIn Stock: 1161BK/GDC-80MA Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 5ST 80 is determined by strict adherence to the following parameters:

• Current Rating: 80 mA (exact match required)
• Voltage Rating: 250 V AC (exact match required)
• Response Time: Slow Blow (exact match required)
• Package / Case: 5mm x 20mm (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Mounting Type: Requires Holder (exact match required)
• Breaking Capacity: 35 A (exact match required)
• Operating Temperature Range: -55°C to 125°C (minimum requirement)

All substitute parts listed meet these criteria. Variations in DC cold resistance and melting I²t values are acceptable within the scope of slow-blow fuse characteristics, as these parameters do not affect the primary substitution criteria of current rating, voltage rating, response time, and physical dimensions.

Parameter Comparison

Engineering Selection Recommendations

All listed substitute parts are functionally equivalent to the 5ST 80 and meet the required electrical and mechanical specifications. Selection among these alternatives should be based on the following factors:

Product Status: The 5ST 80 is obsolete. All substitute parts listed are active products with current manufacturing support and availability.

Regulatory Compliance: The original 5ST 80 is RoHS non-compliant. All substitute parts are RoHS compliant (ROHS3 or RoHS), meeting current environmental regulations for new designs and procurement.

Certification Coverage: The original part carries CE, CSA, IMQ, SEMKO, UL, and VDE approvals. Substitute parts maintain equivalent or expanded certification coverage:

• Bel Fuse Inc. 5ST 80-R: CCC, CE, CSA, cURus, IMQ, SEMKO, VDE
• SCHURTER Inc. 0034.3106: CCC, cURus, VDE
• Littelfuse Inc. 0218.080MXBP, 0218.080TXP, 0218.080VXP: CCC, CE, CSA, KC, SEMKO, UL, VDE
• Littelfuse Inc. 0218.080MXP: CCC, CE, CSA, K-MARK, SEMKO, UL, VDE
• Eaton BK/GDC-80MA: cULus, IMQ

Inventory Availability: Multiple suppliers maintain active stock of substitute parts, ensuring supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can the 5ST 80 be directly replaced with any of the listed substitute parts?

A: Yes. All listed substitute parts meet the identical electrical specifications (80 mA, 250 V AC, slow-blow response) and mechanical dimensions (5mm x 20mm). They are designed for use with the same fuse holder and provide equivalent circuit protection.

Q: What is the difference between the various Littelfuse 0218 series parts?

A: The Littelfuse 0218.080MXP, 0218.080MXBP, 0218.080TXP, and 0218.080VXP all share identical current rating, voltage rating, response time, and physical dimensions. Variations in melting I²t and DC cold resistance are within acceptable tolerances for slow-blow fuse operation and do not affect substitution eligibility.

Q: Is the Bel Fuse Inc. 5ST 80-R a direct replacement for the 5ST 80?

A: Yes. The 5ST 80-R is the active product variant from the same manufacturer with identical electrical and mechanical specifications. It differs only in product status (active vs. obsolete) and RoHS compliance (ROHS3 compliant vs. non-compliant).

Q: Are there any compatibility concerns with different manufacturers' fuse holders?

A: All substitute parts maintain the 5mm x 20mm cartridge dimensions and require a fuse holder for installation. Compatibility is determined by the holder's design specifications, not the fuse manufacturer. Verify that the selected fuse holder is rated for 250 V AC and 80 mA operation.

Q: Which substitute part should be selected for new designs?

A: For new designs, select from active products with current certifications and RoHS compliance. The Bel Fuse Inc. 5ST 80-R, Littelfuse 0218 series parts, SCHURTER 0034.3106, and Eaton BK/GDC-80MA all meet these criteria. Selection may be based on preferred supplier relationships, certification requirements for specific applications, or inventory availability.

Q: What is the significance of the melting I²t parameter?

A: Melting I²t characterizes the thermal energy required to melt the fuse element and is specific to fuse design. While values vary among the listed parts (ranging from 0.015 to 0.075), all parts are classified as slow-blow fuses and meet the 35 A breaking capacity requirement at rated voltage. These variations do not affect substitution eligibility.