BK/AGC-1/2-R Equivalent & Substitute Parts

Part Overview

The BK/AGC-1/2-R is a 500 mA, 250 V AC/DC fast-blow glass cartridge fuse manufactured by Eaton - Electronics Division. This fuse is designed for 3AB and 3AG holder applications with dimensions of 1/4" x 1-1/4" (6.35mm x 31.75mm). The part is currently active in production with 656 pieces in stock. Equivalent and substitute parts are necessary when the primary part becomes unavailable, when alternative sourcing is required for supply chain optimization, or when design flexibility across approved manufacturers is needed.

Substiute Parts

BK/AGC-1/2-R

Eaton - Electronics DivisionIn Stock: 766BK/AGC-1/2-R Datasheet

Current PartRFQ

0001.1021

SCHURTER Inc.In Stock: 10740001.1021 Datasheet

SimilarRFQ

0312.500VXP

Littelfuse Inc.In Stock: 10580312.500VXP Datasheet

SimilarRFQ

0312.500HXP

Littelfuse Inc.In Stock: 40160312.500HXP Datasheet

Parametric EquivalentRFQ

0312.500MXP

Littelfuse Inc.In Stock: 21180312.500MXP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the BK/AGC-1/2-R are classified based on strict parameter matching across the following critical specifications:

Mandatory Matching Parameters:

• Current Rating: 500 mA
• Voltage Rating (AC): 250 V
• Fuse Type: Cartridge, Glass
• Package / Case: 3AB, 3AG, 1/4" x 1-1/4"
• Response Time: Fast Blow
• Mounting Type: Requires Holder

Substitution Categories:

Direct Parametric Equivalents: Parts 0312.500HXP, 0312.500VXP, and 0312.500MXP from Littelfuse Inc. meet all mandatory parameters with identical electrical and mechanical specifications. These parts are classified as parametric equivalents due to matching current rating, voltage rating, fuse type, package dimensions, response time, and holder requirements.

Functional Equivalent (Obsolete Status): Part 0001.1021 from SCHURTER Inc. matches all mandatory parameters but carries an obsolete product status. This part meets the electrical and mechanical requirements for direct substitution but should be evaluated for long-term availability.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Active Status):

The Littelfuse 312 series parts (0312.500HXP, 0312.500VXP, 0312.500MXP) are the preferred substitutes for the BK/AGC-1/2-R. All three parts maintain active product status, carry CSA and UL certifications with additional CE approval, and are ROHS3 compliant. These parts provide identical electrical and mechanical compatibility with the original specification. The Littelfuse parts offer extended operating temperature range (-55°C ~ 125°C) matching the Eaton part and provide higher breaking capacity (35A) at rated voltage.

Secondary Substitute (Obsolete Status):

The SCHURTER 0001.1021 meets all mandatory electrical and mechanical parameters but carries obsolete product status. This part should be selected only when primary substitutes are unavailable and long-term supply is not a requirement. The SCHURTER part operates within a narrower temperature range (-40°C ~ 85°C) and has not specified approval agencies.

Compliance Considerations:

All active substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the original BK/AGC-1/2-R specification. The Littelfuse parts provide broader regulatory approval (CE, CSA, UL) compared to the Eaton part (CSA, UL), offering additional design flexibility for international applications.

Frequently Asked Questions (FAQ)

Q: Can 0312.500HXP, 0312.500VXP, and 0312.500MXP be used interchangeably with BK/AGC-1/2-R?

A: Yes. All three Littelfuse parts are parametric equivalents with identical current rating (500 mA), voltage rating (250 V AC), fuse type (cartridge glass), package dimensions (3AB, 3AG, 1/4" x 1-1/4"), and response time (fast blow). They are directly compatible with any holder designed for the BK/AGC-1/2-R.

Q: What is the difference between the three Littelfuse substitute parts?

A: The 0312.500HXP, 0312.500VXP, and 0312.500MXP are all from the Littelfuse 312 series and share identical electrical and mechanical specifications. The differences are in internal construction or material variants not specified in the provided parameters. All three are active products with equivalent performance characteristics.

Q: Why does the SCHURTER 0001.1021 have a different melting I²t value?

A: The SCHURTER part has a melting I²t of 0.13 compared to 0.385 for the Eaton part and 0.483 for the Littelfuse parts. Despite this difference, the part meets the mandatory electrical parameters (500 mA, 250 V, fast blow response). The lower melting I²t indicates different internal fuse element design. This part is obsolete and should not be selected for new designs.

Q: Are there temperature range limitations when substituting?

A: The Littelfuse 312 series parts operate across -55°C ~ 125°C, matching the Eaton BK/AGC-1/2-R. The SCHURTER 0001.1021 operates within -40°C ~ 85°C, which is narrower. For applications requiring the full -55°C ~ 125°C range, use the Littelfuse parts or the original Eaton part.

Q: What certifications should I verify for my application?

A: The Littelfuse 312 series parts carry CSA, UL, and CE approvals. The original Eaton part carries CSA and UL approvals. The SCHURTER part does not specify approval agencies. Verify that the selected part's certifications meet your application and regional requirements.

Q: Is the slight dimensional difference in the SCHURTER part significant?

A: The SCHURTER 0001.1021 has a length of 1.252" (31.80mm) compared to 1.250" (31.75mm) for other parts. This 0.002" difference is within typical manufacturing tolerance for cartridge fuses and does not affect holder compatibility for 3AB and 3AG applications.