Littelfuse 0325030.H Ceramic Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0325030.H is a 30A 125VAC ceramic cartridge fuse with slow-blow response characteristics, designed for through-hole mounting in 3AB/3AG package format. This part is classified as obsolete, making identification of suitable substitutes essential for ongoing maintenance and repair applications. The ceramic construction and axial lead configuration provide reliable overcurrent protection in legacy equipment designs.

Substiute Parts

0325030.H

Littelfuse Inc.In Stock: 9590325030.H Datasheet

Current PartRFQ

0325030.HXP

Littelfuse Inc.In Stock: 10380325030.HXP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 0325030.H is determined by the following critical parameters:

Mandatory Compatibility Parameters:

• Current Rating: 30 A (exact match required)
• Fuse Type: Cartridge, Ceramic (construction type must match)
• Response Time: Slow Blow (thermal response characteristic must match)
• Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (Axial) (physical form factor must match)
• Mounting Type: Through Hole (installation method must match)
• DC Cold Resistance: 0.0019 Ohms (electrical characteristic must match)
• Melting I²t: 1690 (thermal energy threshold must match)

Voltage Compatibility: Substitute parts must support the 125VAC operating voltage of the original part. Substitutes with higher voltage ratings (250VAC or higher) are acceptable as they provide equivalent or superior voltage handling capability within the same physical and electrical envelope.

The 0325030.HXP qualifies as a direct substitute based on these criteria, maintaining identical current rating, fuse type, response time, package dimensions, and thermal characteristics while offering enhanced voltage ratings and active product status.

Parameter Comparison

Engineering Selection Recommendations

The 0325030.HXP is the direct substitute for the obsolete 0325030.H. Selection is based on the following engineering criteria:

Product Status: The 0325030.HXP maintains active product status, ensuring continued availability and supply chain reliability compared to the obsolete original part.

Electrical Compatibility: Both parts share identical current ratings (30A), response time (slow blow), and thermal characteristics (1690 melting I²t). The substitute's higher AC voltage rating (250V vs. 125V) and addition of DC voltage rating (125V) provide enhanced capability without compromising compatibility in 125VAC applications.

Physical Compatibility: Identical package dimensions (3AB, 3AG, 1/4" x 1-1/4" axial) and through-hole mounting ensure direct mechanical interchangeability without circuit board modifications.

Regulatory Compliance: The 0325030.HXP carries expanded approval certifications (CE, CSA, K-MARK, PSE, UL) and ROHS3 compliance, meeting modern regulatory requirements. The original part's RoHS non-compliance status is resolved with the substitute.

Thermal Performance: Specified operating temperature range (-55°C ~ 125°C) for the substitute provides defined thermal boundaries for equipment design validation.

Frequently Asked Questions (FAQ)

Q: Can the 0325030.HXP be used as a direct replacement for the 0325030.H in existing equipment?

A: Yes. The 0325030.HXP is a direct substitute. Both parts maintain identical current ratings (30A), fuse type (ceramic cartridge), response time (slow blow), package format (3AB/3AG), and thermal characteristics (1690 melting I²t). Physical dimensions are identical, enabling direct installation without circuit board modifications.

Q: What is the difference between the 125VAC rating of the original and the 250VAC rating of the substitute?

A: The substitute's 250VAC rating indicates higher voltage withstand capability. In 125VAC applications, the substitute operates within its rated voltage envelope with additional safety margin. The higher rating does not affect performance in 125VAC circuits and is acceptable for direct substitution.

Q: Are there any compatibility concerns with the DC voltage rating on the substitute?

A: The 0325030.HXP includes a 125VDC rating, which the original part does not specify. This addition does not create incompatibility in AC-only applications. For equipment operating in mixed AC/DC environments, the substitute provides expanded capability.

Q: Does the ROHS3 compliance of the substitute affect its use in legacy equipment?

A: ROHS3 compliance indicates the substitute meets modern environmental standards for hazardous substance restrictions. This compliance status does not affect electrical or thermal performance and is compatible with legacy equipment designs.

Q: Are the approval certifications of the substitute relevant for equipment originally designed with the obsolete part?

A: The substitute's expanded certifications (CE, CSA, K-MARK, PSE, UL) provide broader regulatory recognition. Equipment originally certified with CSA and UL approvals remains compatible with the substitute, which maintains these certifications while adding additional regional approvals.

Q: What is the significance of the specified operating temperature range for the substitute?

A: The -55°C ~ 125°C operating temperature range defines the thermal boundaries within which the substitute maintains specified electrical and thermal characteristics. Equipment operating within this range experiences no performance degradation from the substitute.