Littelfuse 0217.050MXE Glass Cartridge Fuse 50mA 250VAC 5x20mm Equivalent & Substitute Parts

Part Overview

The Littelfuse 0217.050MXE is a 50mA 250VAC fast-blow glass cartridge fuse in 5x20mm axial form factor, designed for through-hole mounting applications. This part is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain electrical and mechanical compatibility. Substitute parts must match the core electrical parameters (50mA current rating, 250V AC voltage rating, fast-blow response) and physical dimensions to ensure direct functional replacement in circuit protection applications.

Substiute Parts

0217.050MXE

Littelfuse Inc.In Stock: 9350217.050MXE Datasheet

Current PartRFQ

0217.050MXEP

Littelfuse Inc.In Stock: 27390217.050MXEP Datasheet

Parametric EquivalentRFQ

0034.1529

SCHURTER Inc.In Stock: 7670034.1529 Datasheet

DirectRFQ

0034.1529.PT

SCHURTER Inc.In Stock: 8910034.1529.PT Datasheet

MFR RecommendedRFQ

BK/S500-V-50-R

Eaton - Electronics DivisionIn Stock: 847BK/S500-V-50-R Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following critical parameters:

• Current Rating: 50 mA (exact match required)
• Voltage Rating: 250 V AC (exact match required)
• Response Time: Fast Blow (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Package Dimensions: 5mm x 20mm (exact match required)
• Breaking Capacity: 35A (exact match required)

Substitute parts are grouped into three categories based on manufacturer and product status:

1. Littelfuse Active Equivalent (0217.050MXEP): Same manufacturer, identical electrical and mechanical specifications, active product status with RoHS3 compliance.

2. SCHURTER Direct Equivalents (0034.1529, 0034.1529.PT): Different manufacturer, identical electrical specifications and package dimensions. 0034.1529 requires external holder mounting; 0034.1529.PT provides through-hole mounting equivalent to the main part.

3. Eaton Electronics Equivalent (BK/S500-V-50-R): Different manufacturer, identical electrical specifications and through-hole mounting, active product status.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: 0217.050MXEP (Littelfuse)

The 0217.050MXEP is the direct active equivalent from the original manufacturer. It maintains identical electrical specifications (50mA, 250V AC, fast-blow response) and mechanical form factor (5x20mm through-hole). This part carries ROHS3 compliance and active product status, making it the preferred choice for direct replacement without circuit redesign.

Secondary Recommendation: 0034.1529.PT (SCHURTER)

The 0034.1529.PT provides through-hole mounting compatibility with identical electrical ratings and package dimensions. As a manufacturer-recommended equivalent with active status and ROHS3 compliance, it serves as a viable alternative when Littelfuse supply is constrained. The melting I²t value (0.00025) is slightly higher than the original part, which remains within acceptable tolerance for fast-blow cartridge fuses in this current class.

Alternative Option: BK/S500-V-50-R (Eaton)

The BK/S500-V-50-R from Eaton Electronics Division meets all electrical and mechanical requirements with through-hole mounting. It carries RoHS compliance and active product status. The melting I²t value (0.0002) falls between the Littelfuse and SCHURTER specifications, maintaining fast-blow characteristics appropriate for 50mA protection circuits.

Not Recommended for Direct Replacement: 0034.1529 (SCHURTER)

The 0034.1529 requires an external fuse holder for mounting, unlike the through-hole design of the main part. This configuration change necessitates circuit board redesign and is not suitable for direct substitution in existing through-hole applications.

Frequently Asked Questions (FAQ)

Q: Can 0217.050MXEP be used as a direct replacement for 0217.050MXE?

A: Yes. The 0217.050MXEP is electrically and mechanically identical to the obsolete 0217.050MXE. Both parts share the same 50mA current rating, 250V AC voltage rating, fast-blow response, and 5x20mm through-hole package. The primary difference is product status (active vs. obsolete) and RoHS compliance (ROHS3 vs. non-compliant).

Q: What is the difference between 0034.1529 and 0034.1529.PT?

A: Both parts are from SCHURTER with identical electrical specifications. The key difference is mounting type: 0034.1529 requires an external fuse holder, while 0034.1529.PT is designed for through-hole mounting. For applications using through-hole PCB layouts, 0034.1529.PT is the appropriate choice.

Q: Are there any performance differences between the substitute parts?

A: All substitute parts maintain the 50mA current rating, 250V AC voltage rating, and 35A breaking capacity. Minor variations exist in melting I²t values (0.00019 to 0.00025), which reflect normal manufacturing tolerances within the fast-blow fuse classification. These variations do not affect functional compatibility in circuit protection applications.

Q: Which substitute part has the best compliance certifications?

A: The 0217.050MXEP (Littelfuse) and 0034.1529.PT (SCHURTER) both carry ROHS3 compliance. The 0217.050MXEP additionally lists CCC, CE, CSA, K-MARK, SEMKO, UL, and VDE approvals. The BK/S500-V-50-R carries RoHS compliance but does not specify additional agency approvals in the provided data.

Q: Can I use BK/S500-V-50-R in place of 0217.050MXE?

A: Yes, from an electrical and mechanical standpoint. The BK/S500-V-50-R meets all core requirements: 50mA current rating, 250V AC voltage rating, fast-blow response, and 5x20mm through-hole package. However, verify that your application does not require the specific agency certifications (UL, VDE, CSA) listed for the Littelfuse part.

Q: What should I consider when selecting between active substitutes?

A: Selection should prioritize: (1) product availability and lead time, (2) required compliance certifications for your application, (3) supply chain continuity with your preferred manufacturer, and (4) cost considerations. All listed active substitutes are electrically and mechanically equivalent for through-hole mounting applications.