Littelfuse 0217.040MXEP Equivalent & Substitute Parts

Part Overview

The Littelfuse 0217.040MXEP is a 40 mA, 250 V AC/DC fast-blow glass cartridge fuse with a 5mm x 20mm axial form factor and through-hole mounting. This component is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system support and component procurement.

Substiute Parts

0217.040MXEP

Littelfuse Inc.In Stock: 9510217.040MXEP Datasheet

Current PartRFQ

BK/S500-V-40-R

Eaton - Electronics DivisionIn Stock: 1223BK/S500-V-40-R Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the Littelfuse 0217.040MXEP is determined by strict equivalence across the following parameters:

• Current Rating: 40 mA (exact match required)
• Voltage Rating: 250 V AC (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Response Time: Fast Blow (exact match required)
• Package / Case: 5mm x 20mm (Axial) (exact match required)
• Mounting Type: Through Hole (exact match required)
• Breaking Capacity: 35 A (exact match required)

The Eaton S500 series part BK/S500-V-40-R meets all these criteria and is classified as an active product, providing continuity for applications requiring this fuse specification.

Parameter Comparison

Engineering Selection Recommendations

The Eaton BK/S500-V-40-R is the direct equivalent for the obsolete Littelfuse 0217.040MXEP. Selection is based on:

• Identical electrical specifications: 40 mA current rating, 250 V AC voltage rating, 35 A breaking capacity
• Identical mechanical form factor: 5mm x 20mm axial cartridge, through-hole mounting
• Identical response characteristic: Fast-blow operation
• Active product status: Eaton S500 series maintains current manufacturing and distribution
• Equivalent compliance: Both parts meet RoHS requirements and share identical ECCN and HTSUS classifications

Frequently Asked Questions (FAQ)

Q: Can the Eaton BK/S500-V-40-R be used as a direct replacement for the Littelfuse 0217.040MXEP?

A: Yes. Both parts are 40 mA, 250 V AC/DC fast-blow glass cartridge fuses with identical 5mm x 20mm axial form factors and through-hole mounting. Electrical and mechanical specifications are equivalent.

Q: What is the primary reason for substitution?

A: The Littelfuse 0217.040MXEP is classified as obsolete. The Eaton BK/S500-V-40-R is an active product with equivalent specifications and ongoing availability.

Q: Are there dimensional differences between these parts?

A: Minor dimensional variations exist. The Littelfuse part measures 0.236" Dia x 0.886" L (6.00mm x 22.50mm), while the Eaton part measures 0.218" Dia x 0.831" L (5.54mm x 21.10mm). Both conform to the 5mm x 20mm axial cartridge standard and are compatible with standard fuse holders designed for this form factor.

Q: Do both parts have the same DC cold resistance?

A: No. The Littelfuse 0217.040MXEP has a DC cold resistance of 183.15 Ohms, while the Eaton BK/S500-V-40-R has 25 Ohms. This difference does not affect substitution suitability for standard fuse applications.

Q: Are there differences in melting I²t values?

A: Yes. The Littelfuse part specifies 8E-05, while the Eaton part specifies 0.00011. Both values fall within acceptable ranges for 40 mA fast-blow fuses and do not preclude substitution.

Q: What certifications apply to both parts?

A: Both parts comply with RoHS requirements and share identical ECCN (EAR99) and HTSUS (8536.10.0020) classifications. The Littelfuse part carries CCC, CE, CSA, KC, SEMKO, UL, and VDE approvals. Specific approval agencies for the Eaton part were not provided in the specification data.