3AB 8-R Ceramic Fuse Equivalent & Substitute Parts

Part Overview

The 3AB 8-R is an 8A 250VAC ceramic cartridge fuse manufactured by Bel Fuse Inc., designed for fast-blow protection in AC applications. This component requires a dedicated holder (3AB or 3AG type) and operates across a temperature range of -55°C to 125°C. The part maintains active product status with 1587 units in current inventory. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, and holder compatibility to ensure direct functional replacement in circuit protection applications.

Substiute Parts

3AB 8-R

Bel Fuse Inc.In Stock: 16773AB 8-R Datasheet

Current PartRFQ

0314008.MXP

Littelfuse Inc.In Stock: 12440314008.MXP Datasheet

DirectRFQ

ABC-8-R

Eaton - Electronics DivisionIn Stock: 1230ABC-8-R Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 3AB 8-R are classified based on the following substitution criteria:

Direct Substitutes maintain identical AC voltage ratings (250V), current ratings (8A), ceramic cartridge construction, fast-blow response characteristics, and 3AB/3AG holder compatibility. These parts are mechanically and electrically interchangeable for AC-only circuit protection applications.

Similar Substitutes extend compatibility to include DC voltage ratings while preserving all AC specifications. These parts are suitable for applications requiring dual AC/DC protection capability, provided the circuit design accommodates the additional DC rating.

The key parameters determining substitution validity are:

• Current Rating: 8 A (mandatory match)
• Voltage Rating - AC: 250 V (mandatory match)
• Fuse Type: Cartridge, Ceramic (mandatory match)
• Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (mandatory match)
• Response Time: Fast Blow (mandatory match)

Parameter Comparison

Engineering Selection Recommendations

All three parts maintain active product status and ROHS3 compliance, qualifying them for current procurement and deployment.

0314008.MXP (Littelfuse Inc.) is a direct substitute for AC-only applications and extends to dual AC/DC circuits with 125V DC capability. This part carries the broadest approval agency coverage (CE, CSA, K-MARK, PSE, UL) and provides higher breaking capacity at rated voltage (750A AC, 10kA DC).

ABC-8-R (Eaton - Electronics Division) is a direct substitute for AC-only applications and extends to dual AC/DC circuits with 125V DC capability. This part carries CSA and UL certifications and maintains 200A AC breaking capacity matching the original 3AB 8-R specification.

For AC-only circuit protection applications, all three parts are electrically and mechanically interchangeable. For applications requiring DC voltage protection, 0314008.MXP and ABC-8-R both provide 125V DC rating. Selection should be based on available inventory, required approval certifications, and breaking capacity specifications for the target application.

Frequently Asked Questions (FAQ)

Q: Can 0314008.MXP and ABC-8-R be used as direct replacements for 3AB 8-R in existing circuits?

A: Yes, for AC-only applications. All three parts share identical 8A current rating, 250V AC voltage rating, ceramic cartridge construction, fast-blow response, and 3AB/3AG holder compatibility. Physical dimensions are equivalent within manufacturing tolerance (length difference of 0.002").

Q: What is the difference between the substitute parts?

A: 0314008.MXP and ABC-8-R both add 125V DC rating capability beyond the AC specification of 3AB 8-R. 0314008.MXP provides higher breaking capacity (750A AC, 10kA DC) compared to ABC-8-R (200A AC, 10kA DC). 0314008.MXP carries additional K-MARK certification.

Q: Are there any compatibility concerns with holder types?

A: No. All three parts use identical 3AB and 3AG holder specifications with 1/4" x 1-1/4" dimensions. They are mechanically interchangeable within the same holder assembly.

Q: How do the melting I²t values affect substitution?

A: Melting I²t values (3AB 8-R: 184, 0314008.MXP: 105, ABC-8-R: 116.5) indicate thermal response characteristics. Lower I²t values represent faster thermal response. Selection should align with circuit protection requirements and coordination with upstream protective devices.

Q: Which substitute part should be selected for new designs?

A: For AC-only protection, all three parts are valid. For dual AC/DC applications, 0314008.MXP or ABC-8-R are required. Selection should consider required certifications, breaking capacity specifications, and thermal response characteristics for the specific application.