5ST 10 Glass Cartridge Fuse 10A 250VAC 5x20mm Equivalent & Substitute Parts

Part Overview

The Bel Fuse Inc. 5ST 10 is a 10A 250VAC glass cartridge fuse with 5mm x 20mm form factor, designed for slow-blow response applications requiring a holder for mounting. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and new designs. Direct replacements and parametric equivalents from active manufacturers are available to ensure circuit protection continuity.

Substiute Parts

5ST 10

Bel Fuse Inc.In Stock: 7565ST 10 Datasheet

Current PartRFQ

5ST 10-R

Bel Fuse Inc.In Stock: 932075ST 10-R Datasheet

DirectRFQ

5ET 10-R

Bel Fuse Inc.In Stock: 68785ET 10-R Datasheet

Parametric EquivalentRFQ

0034.3127

SCHURTER Inc.In Stock: 504010034.3127 Datasheet

DirectRFQ

0218010.HXP

Littelfuse Inc.In Stock: 22770218010.HXP Datasheet

DirectRFQ

0218010.MXBP

Littelfuse Inc.In Stock: 11500218010.MXBP Datasheet

DirectRFQ

0218010.MXP

Littelfuse Inc.In Stock: 23150218010.MXP Datasheet

DirectRFQ

0218010.VXP

Littelfuse Inc.In Stock: 9270218010.VXP Datasheet

DirectRFQ

0218010.MXF11P

Littelfuse Inc.In Stock: 9370218010.MXF11P Datasheet

SimilarRFQ

0218010.TXP

Littelfuse Inc.In Stock: 8220218010.TXP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 5ST 10 is determined by strict equivalence across the following critical parameters:

• Current Rating: 10 A (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: 5mm x 20mm (exact match required)
• Mounting Type: Requires Holder (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)

Substitute parts are grouped into two categories:

Direct Manufacturer Equivalents maintain all critical electrical and mechanical parameters with active product status and modern compliance certifications (RoHS3, REACH Unaffected).

Parametric Equivalents satisfy all functional requirements but may differ in secondary characteristics such as breaking capacity or melting I²t values, which do not affect primary circuit protection function within the specified operating envelope.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: 5ST 10-R (Bel Fuse Inc.)

The 5ST 10-R is the direct active equivalent from the original manufacturer. It maintains identical electrical and mechanical specifications while offering RoHS3 compliance and active product status. This part is preferred for direct replacement in existing designs.

Secondary Recommendations: Littelfuse 218 Series (0218010.HXP, 0218010.MXP, 0218010.VXP, 0218010.MXF11P, 0218010.TXP)

All Littelfuse 218 series parts meet the core functional requirements with 10A 250VAC slow-blow response in 5x20mm form factor. These parts carry comprehensive international certifications (CE, CSA, UL, VDE, PSE, K-MARK, KC) and RoHS3 compliance. Differences in melting I²t (568 vs. 439) and DC cold resistance (0.0045 Ω vs. 0.005 Ω) are within acceptable tolerance for slow-blow fuse applications.

Alternative Recommendation: 0034.3127 (SCHURTER Inc.)

The SCHURTER FST 5x20 series part 0034.3127 provides equivalent functionality with active status and RoHS3 compliance. Mechanical dimensions are 5.20mm x 20mm (versus 5.10mm x 20mm), which remains compatible with standard 5x20mm fuse holders. Melting I²t of 520 is within the slow-blow response envelope.

Parametric Equivalent: 5ET 10-R (Bel Fuse Inc.)

The 5ET 10-R series offers higher breaking capacity (150A) and slightly lower melting I²t (400), suitable for applications requiring enhanced fault current handling while maintaining slow-blow response characteristics.

Frequently Asked Questions (FAQ)

Q: Can I use 5ST 10-R as a direct replacement for 5ST 10?

A: Yes. The 5ST 10-R is the active equivalent from Bel Fuse Inc. with identical electrical ratings (10A, 250VAC), response time (slow-blow), and mechanical form factor (5x20mm). The primary difference is RoHS3 compliance and active product status.

Q: What is the difference between the Littelfuse 218 series variants (HXP, MXP, VXP, MXF11P, TXP)?

A: All variants maintain identical electrical specifications (10A, 250VAC, slow-blow, 5x20mm). Differences are in internal construction and certification scope. Selection depends on regional compliance requirements and supply chain availability.

Q: Does the melting I²t difference between 5ST 10 (439) and Littelfuse parts (568) affect compatibility?

A: No. Both values fall within the slow-blow fuse classification for 10A cartridge fuses. The melting I²t determines thermal response time, and both ranges are suitable for standard circuit protection applications within the -55°C to 125°C operating envelope.

Q: Are all substitute parts compatible with existing 5x20mm fuse holders?

A: Yes. All listed substitutes use the 5x20mm form factor. SCHURTER 0034.3127 has a nominal diameter of 5.20mm versus 5.10mm for others, but this remains within standard fuse holder tolerance specifications.

Q: Which substitute offers the best compliance for new designs?

A: All active substitutes (5ST 10-R, Littelfuse 218 series, SCHURTER 0034.3127) are RoHS3 compliant and REACH Unaffected. Selection should be based on regional certification requirements and supply availability.

Q: Can I mix different substitute parts in the same circuit?

A: All listed substitutes are electrically and mechanically equivalent for the 10A 250VAC slow-blow application. However, for consistency and traceability, use the same part number throughout a circuit or system.