Littelfuse 0218.063MXP Glass Cartridge Fuse 63mA 250VAC 5x20mm Equivalent & Substitute Parts

Part Overview

The Littelfuse 0218.063MXP is a slow-blow glass cartridge fuse rated at 63 mA, 250 V AC/DC with a 5mm x 20mm form factor. This component is designed for circuit protection in applications requiring time-delayed response to transient overcurrent conditions. The part maintains active product status with full compliance to international safety standards. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, and approval certifications to ensure direct functional interchangeability in holder-based fuse applications.

Substiute Parts

0218.063MXP

Littelfuse Inc.In Stock: 19930218.063MXP Datasheet

Current PartRFQ

0218.063HXP

Littelfuse Inc.In Stock: 10580218.063HXP Datasheet

DirectRFQ

5ST 63-R

Bel Fuse Inc.In Stock: 566535ST 63-R Datasheet

DirectRFQ

BK/S506-63-R

Eaton - Electronics DivisionIn Stock: 839BK/S506-63-R Datasheet

DirectRFQ

GDC-63MA

Eaton - Electronics DivisionIn Stock: 1179GDC-63MA Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 0218.063MXP is determined by the following critical parameters:

• Current Rating: 63 mA (exact match required)
• Voltage Rating: 250 V AC (exact match required)
• Response Time: Slow Blow (exact match required)
• Package Dimensions: 5mm x 20mm (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Breaking Capacity: 35A (exact match required)

All identified substitute parts meet these core electrical and mechanical specifications. Variations in secondary parameters such as DC cold resistance and melting I²t do not affect functional interchangeability within the specified electrical operating envelope. Approval agency certifications may vary between manufacturers while maintaining compliance with applicable international standards.

Parameter Comparison

Engineering Selection Recommendations

All five parts listed maintain active product status and are suitable for direct substitution based on electrical and mechanical parameter equivalence. Selection among these alternatives may be influenced by the following factors:

Littelfuse 0218.063HXP: Direct manufacturer equivalent to the primary part number. Identical electrical characteristics and approval certifications. Recommended as the primary substitute when Littelfuse supply continuity is required.

Bel Fuse 5ST 63-R: Functionally equivalent with highest inventory availability (56,609 units). Approval certifications include cURus and IMQ in addition to standard agencies. Melting I²t value of 0.008 represents the lowest thermal energy threshold among alternatives.

Eaton BK/S506-63-R: Functionally equivalent with lowest DC cold resistance (6.96 Ohms). Approval certifications include BSI and UR. Moisture sensitivity level specified as 1 (Unlimited).

Eaton GDC-63MA: Manufacturer-recommended substitute with identical DC cold resistance to BK/S506-63-R (6.96 Ohms). Approval certifications limited to cURus and IMQ. Moisture sensitivity level specified as 1 (Unlimited).

All parts comply with RoHS3 requirements and REACH regulations. Selection should be based on supply chain availability, approval agency requirements specific to the end application, and any design-specific thermal or resistance constraints.

Frequently Asked Questions (FAQ)

Q: Can the 0218.063HXP be used as a direct replacement for the 0218.063MXP?

A: Yes. Both parts are manufactured by Littelfuse, share identical current ratings (63 mA), voltage ratings (250 V AC), response time (Slow Blow), package dimensions (5mm x 20mm), and approval certifications. They are functionally equivalent.

Q: What is the significance of the different DC cold resistance values among the substitute parts?

A: DC cold resistance values (ranging from 6.96 to 23.9 Ohms) reflect manufacturing differences but do not affect fuse operation within the specified electrical operating envelope. These values are provided for circuit analysis purposes and do not impact substitution eligibility.

Q: Are all substitute parts compatible with existing fuse holders designed for the 0218.063MXP?

A: Yes. All substitute parts share the identical 5mm x 20mm cartridge form factor and require the same holder type. Physical compatibility is assured across all listed alternatives.

Q: Do the different melting I²t values affect substitution suitability?

A: Melting I²t values (ranging from 0.008 to 0.021) represent thermal energy thresholds but remain within the functional specification for 63 mA slow-blow fuses. All parts meet the 35A breaking capacity requirement at rated voltage. Substitution is valid based on the specified electrical ratings.

Q: Which substitute part offers the best supply availability?

A: The Bel Fuse 5ST 63-R offers the highest inventory level at 56,609 units in stock, compared to 1,045 units for the Littelfuse 0218.063HXP and 775 units for the Eaton BK/S506-63-R.

Q: Are there any approval agency differences that would restrict substitution?

A: All parts maintain compliance with major international safety standards. The Littelfuse parts include K-MARK and SEMKO certifications, while Bel Fuse includes cURus and IMQ. Eaton parts vary in certification scope. Selection should align with specific application approval requirements.