Littelfuse 0326020.H Ceramic Fuse 20A 250VAC - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0326020.H is a 20A 250VAC ceramic cartridge fuse in the 326 series, designed for 3AB/3AG holder applications with 1/4" x 1-1/4" dimensions. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and new designs. The fuse provides slow-blow response characteristics suitable for circuits requiring transient current tolerance.

Substiute Parts

0326020.H

Littelfuse Inc.In Stock: 11550326020.H Datasheet

Current PartRFQ

0326020.HXP

Littelfuse Inc.In Stock: 78820326020.HXP Datasheet

DirectRFQ

0326020.MXCCP

Littelfuse Inc.In Stock: 11850326020.MXCCP Datasheet

Parametric EquivalentRFQ

0326020.MXDP

Littelfuse Inc.In Stock: 13220326020.MXDP Datasheet

Parametric EquivalentRFQ

0326020.MXP

Littelfuse Inc.In Stock: 2203670326020.MXP Datasheet

Parametric EquivalentRFQ

0326020.VXP

Littelfuse Inc.In Stock: 9010326020.VXP Datasheet

Parametric EquivalentRFQ

BK/MDA-20-R

Eaton - Electronics DivisionIn Stock: 3272BK/MDA-20-R Datasheet

Parametric EquivalentRFQ

MDA-20-R

Eaton - Electronics DivisionIn Stock: 722MDA-20-R Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 0326020.H is determined by the following critical parameters:

• Current Rating: 20 A (exact match required)
• Voltage Rating - AC: 250 V (exact match required)
• Fuse Type: Cartridge, Ceramic (exact match required)
• Response Time: Slow Blow (exact match required)
• Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (exact match required)
• Melting I²t: 575 (preferred for thermal characteristics)

Substitute parts are grouped into two categories:

Group 1 - Direct Littelfuse Equivalents (250VAC / 60VDC): Parts 0326020.HXP and 0326020.MXP share identical AC voltage, current, response time, package, and melting I²t specifications. These parts add DC voltage capability (60V) and are active products with enhanced compliance certifications.

Group 2 - Enhanced DC Voltage Equivalents (250VAC / 125VDC): Parts 0326020.MXCCP, 0326020.VXP, MDA-20-R, and BK/MDA-20-R maintain all critical AC parameters while providing higher DC voltage ratings (125V). These are suitable for applications requiring DC circuit protection.

Group 3 - Alternative Thermal Characteristic (60VDC / I²t 1900): Part 0326020.MXDP provides identical AC/DC voltage ratings to Group 1 but with elevated melting I²t (1900), suitable for circuits with higher inrush current requirements.

Parameter Comparison

Engineering Selection Recommendations

For AC-only applications (no DC component): Select 0326020.HXP or 0326020.MXP. Both are active Littelfuse products with ROHS3 compliance and identical AC specifications to the obsolete 0326020.H. These provide the closest functional replacement with modern certifications (CE, CSA, K-MARK, PSE, UL).

For applications requiring DC circuit protection up to 60V: Select 0326020.HXP or 0326020.MXP. Both provide 60V DC rating with 500A DC breaking capacity and maintain the original 575 melting I²t characteristic.

For applications requiring DC circuit protection up to 125V: Select 0326020.MXCCP or 0326020.VXP (Littelfuse) or MDA-20-R / BK/MDA-20-R (Eaton). All four parts provide 125V DC rating. Littelfuse parts maintain 575 melting I²t; Eaton parts provide higher breaking capacity (10kA DC) with lower melting I²t (483.45).

For circuits with high inrush current: Select 0326020.MXDP, which maintains 60V DC rating but provides elevated melting I²t of 1900 for transient current tolerance.

For highest breaking capacity requirements: Select MDA-20-R or BK/MDA-20-R (Eaton), which provide 1.5kA AC and 10kA DC breaking capacity, significantly exceeding Littelfuse equivalents.

Frequently Asked Questions (FAQ)

Q: Can I directly replace 0326020.H with any of these substitute parts?

A: Yes, all listed parts maintain the critical specifications: 20A current rating, 250V AC voltage, slow-blow response, and 3AB/3AG package compatibility. However, verify your circuit's DC voltage requirements before selection, as the original part does not specify DC rating.

Q: What is the difference between 0326020.HXP and 0326020.MXP?

A: Both parts are functionally equivalent with identical AC/DC ratings, breaking capacity, and melting I²t. The primary difference is inventory availability (0326020.MXP has significantly higher stock) and potential manufacturing date variations. Either part is suitable for direct substitution.

Q: Why do some substitute parts have higher breaking capacity?

A: Breaking capacity indicates the maximum fault current the fuse can safely interrupt. Eaton MDA-20-R and BK/MDA-20-R parts (1.5kA AC, 10kA DC) are rated for higher fault current environments than Littelfuse equivalents (400A AC, 500-600A DC). Select based on your circuit's maximum available fault current.

Q: What is the significance of melting I²t?

A: Melting I²t defines the thermal energy required to melt the fuse element. Lower values (483.45 for Eaton parts) provide faster response to overcurrent; higher values (575 standard, 1900 for 0326020.MXDP) tolerate higher inrush currents. Select based on your circuit's transient current characteristics.

Q: Are all substitute parts RoHS compliant?

A: All active substitute parts listed are ROHS3 compliant. The original 0326020.H is RoHS non-compliant. If RoHS compliance is required for your application, any active substitute part satisfies this requirement.

Q: What certifications should I verify for my application?

A: All substitute parts carry CE, CSA, and UL certifications. Additional certifications vary: Littelfuse parts include K-MARK and PSE; Eaton parts do not. Verify your regional requirements (North America, Europe, Asia-Pacific) before final selection.

Q: Can I use BK/MDA-20-R (black variant) interchangeably with MDA-20-R?

A: Yes. Both are electrically and mechanically identical. The "BK" designation indicates black color coding. Selection between them is based on color identification requirements in your system.