5ETP 6.3-R Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The 5ETP 6.3-R is a 6.3 A, 250 V AC/DC slow-blow glass cartridge fuse manufactured by Bel Fuse Inc. in a 5mm x 20mm axial through-hole package. This component is active in production and widely used in power distribution, industrial control, and consumer electronics applications where circuit protection and controlled fault response are required. Equivalent and substitute parts are identified when component availability changes, supply chain constraints occur, or design flexibility is needed while maintaining electrical and mechanical compatibility.

Substiute Parts

5ETP 6.3-R

Bel Fuse Inc.In Stock: 15155ETP 6.3-R Datasheet

Current PartRFQ

5STP 6.3-R

Bel Fuse Inc.In Stock: 33815STP 6.3-R Datasheet

Parametric EquivalentRFQ

021906.3MXAEP

Littelfuse Inc.In Stock: 1970021906.3MXAEP Datasheet

DirectRFQ

021806.3MXEP

Littelfuse Inc.In Stock: 2436021806.3MXEP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 5ETP 6.3-R is determined by the following mandatory parameters:

• Current Rating: 6.3 A (exact match required)
• Voltage Rating (AC): 250 V (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Response Time: Slow Blow (exact match required)
• Package / Case: 5mm x 20mm (Axial) (exact match required)
• Mounting Type: Through Hole (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (minimum requirement)

All identified substitute parts meet these core electrical and mechanical parameters. Variations in breaking capacity, melting I²t, DC cold resistance, and physical dimensions within tolerance are permitted. Approval agency certifications may differ based on regional requirements and manufacturer specifications.

Parameter Comparison

Engineering Selection Recommendations

All four parts listed are active products with ROHS3 compliance and meet the mandatory electrical and mechanical parameters for direct substitution in applications requiring a 6.3 A, 250 V AC/DC slow-blow glass cartridge fuse in a 5mm x 20mm through-hole package.

The 5ETP 6.3-R and 021906.3MXAEP both feature a breaking capacity of 150 A, suitable for applications requiring higher fault current withstand capability. The 5STP 6.3-R and 021806.3MXEP feature a breaking capacity of 63 A, appropriate for circuits with lower available fault currents.

Approval agency certifications vary by manufacturer and regional market requirements. The 5ETP 6.3-R and 5STP 6.3-R carry CCC, CE, CSA, cULus, SEMKO, and VDE certifications. The Littelfuse parts (021906.3MXAEP and 021806.3MXEP) carry CCC, CE, CSA, PSE, SEMKO, UL, VDE certifications, with 021806.3MXEP additionally including K-MARK certification.

Selection between these parts depends on application-specific breaking capacity requirements and regional certification mandates. All parts are suitable for the same circuit protection function within their specified electrical ratings.

Frequently Asked Questions (FAQ)

Q: Can the 5STP 6.3-R be used as a direct replacement for the 5ETP 6.3-R?

A: Yes. Both parts share identical current rating (6.3 A), voltage rating (250 V AC), fuse type (cartridge, glass), response time (slow blow), package (5mm x 20mm axial), and mounting type (through hole). The primary difference is breaking capacity: 5ETP has 150 A breaking capacity while 5STP has 63 A. Selection depends on the available fault current in the application circuit.

Q: What is the difference between Bel Fuse and Littelfuse parts in this list?

A: Both manufacturers produce functionally equivalent 6.3 A, 250 V slow-blow glass cartridge fuses in the same 5mm x 20mm package. Differences include breaking capacity ratings, melting I²t values, DC cold resistance, and approval agency certifications. Littelfuse parts have slightly larger physical dimensions (5.80mm diameter vs. 5.50mm for Bel Fuse) but remain compatible with standard 5mm x 20mm fuse holders.

Q: Are there any compatibility concerns when substituting between these parts?

A: No compatibility concerns exist for the listed substitute parts. All meet the mandatory electrical parameters (6.3 A, 250 V AC, slow blow, through hole) and mechanical package specifications (5mm x 20mm axial). Physical dimension variations are within standard fuse holder tolerances.

Q: Which part should I select if breaking capacity is critical to my application?

A: If your circuit has available fault currents exceeding 63 A, select either the 5ETP 6.3-R or 021906.3MXAEP, both rated for 150 A breaking capacity. If available fault current is below 63 A, any of the four parts are suitable.

Q: Do all parts have the same approval certifications?

A: No. The Bel Fuse parts (5ETP 6.3-R and 5STP 6.3-R) carry CCC, CE, CSA, cULus, SEMKO, and VDE certifications. The Littelfuse parts carry CCC, CE, CSA, PSE, SEMKO, UL, and VDE certifications, with 021806.3MXEP additionally including K-MARK. Select based on regional certification requirements for your application.