AT-20 Blade Fuse Equivalent & Substitute Parts

Part Overview

The AT-20 is a blade fuse manufactured by Eaton - Bussmann Electrical Division, classified as an AC DC fuse in blade configuration. This part is currently obsolete, which necessitates identification of functionally equivalent alternatives for ongoing maintenance and repair applications. The AT-20 maintains RoHS compliance and carries an MSL rating of 1 (Unlimited), indicating no moisture sensitivity constraints during storage and handling.

Substiute Parts

AT-20

Eaton - Bussmann Electrical DivisionIn Stock: 833AT-20 Datasheet

Current PartRFQ

ATC-20

Eaton - Bussmann Electrical DivisionIn Stock: 1074ATC-20 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete AT-20 is based on the following electrical and mechanical parameters:

• Fuse Type: Blade configuration (automotive standard)
• Current Rating: 20 A
• Voltage Rating: 32 V DC
• Response Characteristic: Fast Blow
• Package / Case: Blade, ATO/ATC form factor
• Manufacturer Continuity: Same manufacturer (Eaton - Bussmann Electrical Division)
• Compliance: RoHS Compliant status maintained
• Regulatory Classification: HTSUS 8536.10.0040

The ATC-20 is identified as the manufacturer-recommended substitute, meeting all critical electrical parameters and maintaining the same blade fuse architecture required for direct replacement in existing holder assemblies.

Parameter Comparison

Engineering Selection Recommendations

The ATC-20 is the designated substitute for the obsolete AT-20 based on the following factors:

• Active Product Status: The ATC-20 maintains active production status, ensuring continued availability and supply chain reliability.
• Compliance Alignment: Both parts maintain RoHS Compliant certification and identical ECCN/HTSUS classifications, ensuring regulatory continuity.
• Manufacturer Continuity: Both parts originate from Eaton - Bussmann Electrical Division, maintaining design and quality standards.
• Electrical Equivalence: The ATC-20 provides 20 A current rating at 32 V DC with Fast Blow response, matching the functional requirements of the AT-20.
• Mechanical Compatibility: The ATO/ATC blade form factor ensures direct physical compatibility with existing blade fuse holders designed for the AT-20.

Frequently Asked Questions (FAQ)

Q: Can the ATC-20 be used as a direct replacement for the AT-20?

A: Yes. The ATC-20 is the manufacturer-recommended substitute. Both parts share identical electrical specifications (20 A, 32 V DC, Fast Blow response) and the same blade fuse form factor, enabling direct installation in existing holder assemblies without modification.

Q: What is the difference between AT-20 and ATC-20 designations?

A: The AT-20 is an obsolete part number. The ATC-20 is the active equivalent designation from the same manufacturer, representing the current production part for this fuse specification.

Q: Are there any compliance or certification differences between these parts?

A: No. Both the AT-20 and ATC-20 maintain RoHS Compliant status, identical ECCN (EAR99) and HTSUS (8536.10.0040) classifications, and UL approval agency certification for the ATC-20.

Q: What does the blade form factor ATO/ATC indicate?

A: ATO/ATC refers to the standardized automotive blade fuse form factor. This designation indicates the physical size and connector configuration, ensuring compatibility with standard blade fuse holders used in automotive and industrial applications.

Q: Is the MSL rating relevant when substituting these parts?

A: The AT-20 carries an MSL rating of 1 (Unlimited), indicating no moisture sensitivity constraints. The ATC-20 lists MSL as Not Applicable, which is consistent with blade fuse construction and does not affect substitution suitability.