Littelfuse 0217.040MXP Glass Cartridge Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0217.040MXP is a 40 mA, 250 V AC/DC fast-blow glass cartridge fuse in 5mm x 20mm form factor, designed for circuit protection in applications requiring holder-mounted fuse elements. This part is classified as obsolete, making equivalent substitute parts necessary for ongoing system maintenance and new design implementations. Substitute parts must maintain identical electrical ratings, mechanical dimensions, and response characteristics to ensure direct compatibility in existing fuse holders.

Substiute Parts

0217.040MXP

Littelfuse Inc.In Stock: 8930217.040MXP Datasheet

Current PartRFQ

0034.1528

SCHURTER Inc.In Stock: 37080034.1528 Datasheet

DirectRFQ

BK/S500-40-R

Eaton - Electronics DivisionIn Stock: 811BK/S500-40-R Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 0217.040MXP are qualified based on the following mandatory parameters:

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

All identified substitute parts meet these criteria and are therefore electrically and mechanically interchangeable with the original Littelfuse component.

Parameter Comparison

Engineering Selection Recommendations

Both SCHURTER 0034.1528 and Eaton BK/S500-40-R are active product alternatives to the obsolete Littelfuse 0217.040MXP. Selection between these substitutes should be based on:

• Availability and lead time requirements
• Compliance certifications: SCHURTER 0034.1528 carries CCC, cURus, and VDE approvals; Eaton BK/S500-40-R approval agencies are not specified
• Packaging format: SCHURTER is supplied in bulk; Eaton is supplied in bulk
• Melting I²t characteristics: SCHURTER 0034.1528 (0.000128) and Eaton BK/S500-40-R (0.00011) both differ slightly from the original (8E-05), but remain within acceptable fast-blow fuse performance parameters for the 40 mA, 250 V rating

All three parts are ROHS3 compliant and suitable for the specified operating temperature range where applicable.

Frequently Asked Questions (FAQ)

Q: Can SCHURTER 0034.1528 or Eaton BK/S500-40-R be used as direct replacements for Littelfuse 0217.040MXP?

A: Yes. Both substitute parts match all critical electrical and mechanical parameters: 40 mA current rating, 250 V AC voltage rating, 5mm x 20mm form factor, fast-blow response, 35 A breaking capacity, and holder-mount configuration. They are electrically and mechanically interchangeable.

Q: What is the significance of the different Melting I²t values?

A: Melting I²t defines the thermal energy required to melt the fuse element. The three parts show variations (8E-05, 0.000128, 0.00011), but all are classified as fast-blow fuses at the 40 mA rating. These variations are within acceptable tolerance for this fuse category and do not affect substitutability.

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

A: SCHURTER 0034.1528 specifies CCC, cURus, and VDE certifications. Eaton BK/S500-40-R does not list approval agencies in the provided data. Both are ROHS3 compliant. Verify compliance requirements for your specific application before selection.

Q: Do all parts fit the same fuse holder?

A: Yes. All three parts share identical mechanical dimensions (5mm x 20mm, 0.205" Dia x 0.787" L) and require a holder for mounting. They are mechanically interchangeable in any standard 5x20mm fuse holder.

Q: What is the availability status of these parts?

A: Littelfuse 0217.040MXP is obsolete. SCHURTER 0034.1528 and Eaton BK/S500-40-R are both active products with current inventory availability.