Littelfuse 0326030.H Ceramic Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0326030.H is a 30A 125VAC ceramic cartridge fuse designed for slow-blow applications requiring a 3AB/3AG holder. This fuse is classified as obsolete, making identification of compatible substitute parts essential for system maintenance and component replacement. The ceramic construction and slow-blow response time provide protection in circuits requiring tolerance for inrush currents while maintaining reliable fault interruption at rated conditions.

Substiute Parts

0326030.H

Littelfuse Inc.In Stock: 7900326030.H Datasheet

Current PartRFQ

0326030.HXP

Littelfuse Inc.In Stock: 7610326030.HXP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the Littelfuse 0326030.H is determined by the following critical parameters:

• Current Rating: Must be 30 A to ensure proper circuit protection
• Fuse Type & Construction: Ceramic cartridge with slow-blow response time
• Physical Package: 3AB/3AG holder compatibility, 1/4" x 1-1/4" dimensions
• Melting I²t: 1690 (thermal energy threshold)
• DC Cold Resistance: 0.0019 Ohms
• Voltage Compatibility: AC voltage rating must be sufficient for the application

The substitute part 0326030.HXP maintains identical current rating, fuse type, package dimensions, melting I²t, and DC cold resistance. The key difference is an elevated voltage rating (250VAC/125VDC versus 125VAC), which provides broader application compatibility while maintaining all mechanical and thermal characteristics required for holder compatibility and circuit protection performance.

Parameter Comparison

Engineering Selection Recommendations

The 0326030.HXP serves as the direct substitute for the obsolete 0326030.H. Both parts share identical current ratings, fuse construction, thermal characteristics, and physical dimensions required for 3AB/3AG holder compatibility.

The 0326030.HXP is classified as Active product status, ensuring continued availability and supply chain reliability. The substitute part carries expanded regulatory approvals (CE, K-MARK, PSE in addition to CSA and UL) and achieves ROHS3 compliance, addressing modern environmental and regulatory requirements that the original part does not meet.

For applications operating at 125VAC, the 0326030.HXP's 250VAC rating provides margin without affecting protection characteristics. The specified operating temperature range (-55°C ~ 125°C) and enhanced breaking capacity for DC applications (600A DC versus unspecified for the main part) represent functional improvements while maintaining backward compatibility with existing holder installations.

Frequently Asked Questions (FAQ)

Q: Can the 0326030.HXP be used as a direct replacement for the 0326030.H?

A: Yes. Both parts are 30A ceramic cartridge fuses with identical slow-blow response, melting I²t (1690), DC cold resistance (0.0019 Ohms), and 3AB/3AG package dimensions. The substitute part's higher voltage rating (250VAC/125VDC) is compatible with 125VAC applications.

Q: What is the significance of the higher voltage rating on the substitute part?

A: The 0326030.HXP's 250VAC rating provides voltage margin for the same 30A current protection. This does not change the fuse's response to overcurrent conditions; it only expands the range of voltage systems where the part can be safely applied.

Q: Are the physical dimensions identical between both parts?

A: Yes. Both parts measure 0.250" diameter x 1.250" length (6.35mm x 31.75mm) and require the same 3AB/3AG holder. No mechanical modifications are required for substitution.

Q: What is the difference in regulatory compliance?

A: The 0326030.H carries CSA and UL approvals. The 0326030.HXP carries CE, CSA, K-MARK, PSE, and UL approvals, plus ROHS3 compliance. The substitute part meets a broader set of international standards.

Q: Does the melting I²t value differ between the parts?

A: No. Both parts have a melting I²t of 1690, ensuring identical thermal protection characteristics and response to sustained overcurrent conditions.

Q: Is the substitute part suitable for DC applications?

A: The 0326030.HXP is rated for 125VDC with a 600A breaking capacity for DC. The original part does not specify DC ratings. For DC circuit applications, the substitute part provides explicit DC performance data.