Littelfuse 021302.5MXEP Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 021302.5MXEP is a 2.5 A, 250 V AC/DC slow-blow glass cartridge fuse designed for through-hole mounting in 5mm x 20mm form factor applications. This component is classified as Active product status and is widely used in power distribution, circuit protection, and industrial control systems. Substitute parts are identified when equivalent electrical and mechanical parameters are required due to inventory constraints, supply chain considerations, or design standardization across product lines.

Substiute Parts

021302.5MXEP

Littelfuse Inc.In Stock: 1306021302.5MXEP Datasheet

Current PartRFQ

021802.5MXEP

Littelfuse Inc.In Stock: 3166021802.5MXEP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the Littelfuse 021302.5MXEP is permissible with parts meeting the following criteria:

• Current Rating: Exactly 2.5 A
• Voltage Rating (AC): Exactly 250 V
• Fuse Type: Cartridge, Glass
• Response Time: Slow Blow
• Package / Case: 5mm x 20mm (Axial)
• Mounting Type: Through Hole
• Breaking Capacity @ Rated Voltage: 35 A minimum
• Operating Temperature Range: -55°C to 125°C or broader
• RoHS Compliance: ROHS3 Compliant

The Littelfuse 021802.5MXEP qualifies as a parametric equivalent substitute, as it maintains all critical electrical and mechanical parameters within the specified tolerances while belonging to a different product series (218 vs. 213).

Parameter Comparison

Engineering Selection Recommendations

Both the Littelfuse 021302.5MXEP and 021802.5MXEP are Active product status components manufactured by Littelfuse Inc. and maintain full ROHS3 compliance. The 021802.5MXEP substitute part carries expanded regulatory approvals including K-MARK and UL certification in addition to the certifications held by the main part (BSI, CCC, CE, CSA, PSE, SEMKO, UR, VDE). Selection between these parts should be based on design certification requirements, supply availability, and inventory management objectives, as both parts satisfy identical electrical and mechanical specifications for 2.5 A, 250 V AC/DC slow-blow cartridge fuse applications in 5mm x 20mm through-hole configurations.

Frequently Asked Questions (FAQ)

Q: Can the Littelfuse 021802.5MXEP be used as a direct replacement for the 021302.5MXEP?

A: Yes. Both parts are identical in current rating (2.5 A), voltage rating (250 V AC), fuse type (cartridge, glass), response time (slow blow), package dimensions (5mm x 20mm), and mounting configuration (through hole). Both maintain the same operating temperature range and breaking capacity specifications.

Q: What is the difference between the 213 and 218 series designations?

A: The series designation indicates the product line within Littelfuse's cartridge fuse portfolio. Both series meet the same electrical and mechanical requirements for this 2.5 A, 250 V application. The series difference does not affect functional compatibility in circuit protection applications.

Q: Are there differences in regulatory certifications between these parts?

A: The 021802.5MXEP includes K-MARK and UL certifications in addition to the certifications on the 021302.5MXEP. If your application requires specific regulatory approvals, verify that the selected part carries the necessary certifications for your target market or end-use application.

Q: Do these fuses have different melting I²t values?

A: Yes. The 021302.5MXEP has a melting I²t of 138, while the 021802.5MXEP has a melting I²t of 23.25. Both are slow-blow fuses rated for 2.5 A at 250 V. The I²t value represents the thermal energy required to melt the fuse element and is a characteristic of the specific fuse design within the slow-blow classification.

Q: What is the DC cold resistance specification?

A: The 021302.5MXEP has a DC cold resistance of 0.0305 Ohms, while the 021802.5MXEP has a DC cold resistance of 0.0219 Ohms. Both values are within acceptable ranges for cartridge fuse applications and do not affect the AC voltage rating or current protection characteristics.

Q: Are both parts RoHS compliant?

A: Yes. Both the 021302.5MXEP and 021802.5MXEP are ROHS3 compliant and REACH unaffected, meeting environmental regulatory requirements for electronic component manufacturing and distribution.