Littelfuse 0322003.H Ceramic Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0322003.H is a 3A ceramic cartridge fuse rated for 250V AC and 65V DC operation. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing system maintenance and new designs. The fuse is designed for fast-blow response and requires a compatible holder (3AB, 3AG format). Identifying suitable alternatives ensures continuity of supply while maintaining electrical performance and safety compliance.

Substiute Parts

0322003.H

Littelfuse Inc.In Stock: 7350322003.H Datasheet

Current PartRFQ

BK/ABC-3-R

Eaton - Electronics DivisionIn Stock: 1797BK/ABC-3-R Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the Littelfuse 0322003.H is based on the following critical parameters:

• Current Rating: Must be 3 A (exact match required)
• Voltage Rating - AC: Must be 250 V (exact match required)
• Voltage Rating - DC: Must be equal to or greater than 65 V
• Fuse Type: Must be Cartridge, Ceramic
• Response Time: Must be Fast Blow
• Package / Case: Must be 3AB, 3AG, 1/4" x 1-1/4" (physical compatibility with existing holders)
• Breaking Capacity: Must be 100A or greater

The Eaton BK/ABC-3-R meets all substitution criteria with enhanced DC voltage rating (125V vs. 65V) and improved breaking capacity specifications, making it a direct functional replacement.

Parameter Comparison

Engineering Selection Recommendations

The Eaton BK/ABC-3-R is the qualified substitute for the obsolete Littelfuse 0322003.H. Selection is based on the following factors:

Product Status: The Littelfuse component is obsolete, while the Eaton alternative is active and in production, ensuring long-term availability.

Electrical Compatibility: Both components share identical current ratings (3A), AC voltage ratings (250V), and fast-blow response characteristics. The Eaton part provides enhanced DC voltage rating (125V vs. 65V), which is backward-compatible with the original 65V DC specification.

Mechanical Compatibility: Both fuses use the identical 3AB/3AG cartridge format with 1/4" x 1-1/4" dimensions, ensuring direct physical compatibility with existing fuse holders.

Regulatory Compliance: The Eaton BK/ABC-3-R holds dual certifications (CSA and UL) compared to the original UL-only certification. The substitute is ROHS3 compliant, addressing modern environmental and regulatory requirements.

Performance Characteristics: The Eaton part delivers superior breaking capacity in DC applications (10kA DC vs. unspecified DC capacity) and lower DC cold resistance (0.047 Ohms vs. 0.063 Ohms), providing improved electrical performance.

Frequently Asked Questions (FAQ)

Q: Can the Eaton BK/ABC-3-R be used as a direct replacement for the Littelfuse 0322003.H?

A: Yes. Both components share identical current ratings, AC voltage ratings, fuse type, response time, and physical package dimensions. The Eaton part is electrically and mechanically compatible with all existing installations designed for the Littelfuse component.

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

A: The Eaton BK/ABC-3-R is rated for 125V DC compared to the original 65V DC rating. This higher rating provides additional safety margin in DC applications and does not affect AC operation. The substitute remains fully compatible with circuits designed for 65V DC operation.

Q: Are there any compatibility issues with existing fuse holders?

A: No. Both the Littelfuse 0322003.H and Eaton BK/ABC-3-R use the 3AB/3AG cartridge format with identical physical dimensions (0.250" Dia x 1.250" L). They are mechanically interchangeable in all standard fuse holders designed for this package type.

Q: What is the difference in DC cold resistance between the two parts?

A: The Eaton BK/ABC-3-R has a DC cold resistance of 0.047 Ohms compared to 0.063 Ohms for the Littelfuse component. This lower resistance in the substitute results in reduced voltage drop and improved thermal performance in DC circuits.

Q: Does the Eaton substitute meet current environmental compliance standards?

A: Yes. The Eaton BK/ABC-3-R is ROHS3 compliant and REACH unaffected, meeting modern environmental and regulatory requirements. The original Littelfuse component is RoHS non-compliant.

Q: What certifications does the Eaton substitute hold?

A: The Eaton BK/ABC-3-R holds CSA and UL certifications. The original Littelfuse component holds UL certification only. Both certifications are recognized for electrical safety compliance.