BK/AGC-1/2 Equivalent & Substitute Parts

Part Overview

The BK/AGC-1/2 is a 500 mA, 250 V AC/DC fast-blow glass cartridge fuse manufactured by Eaton - Electronics Division. This component is classified as obsolete and requires a compatible fuse holder for installation. The 3AB/3AG package format (1/4" x 1-1/4") is a standard industrial fuse configuration. Due to the obsolete product status, equivalent and substitute parts from active product lines are available to maintain circuit protection functionality in existing and new designs.

Substiute Parts

BK/AGC-1/2

Eaton - Electronics DivisionIn Stock: 1105BK/AGC-1/2 Datasheet

Current PartRFQ

AGC-1/2-R

Eaton - Electronics DivisionIn Stock: 1065AGC-1/2-R Datasheet

DirectRFQ

BK/AGC-1/2-R

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

DirectRFQ

BK/AGC-1/2KK-R

Eaton - Electronics DivisionIn Stock: 854BK/AGC-1/2KK-R Datasheet

Parametric EquivalentRFQ

BK/AGC-B-1/2

Eaton - Electronics DivisionIn Stock: 812BK/AGC-B-1/2 Datasheet

Parametric EquivalentRFQ

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

Substitution of the BK/AGC-1/2 is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

• Current Rating: 500 mA (exact match required)
• Voltage Rating: 250 V AC (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Response Time: Fast Blow (exact match required)
• Package / Case: 3AB, 3AG, 1/4" x 1-1/4" (exact match required)
• Physical Dimensions: 0.250" Dia x 1.250" L (exact match required)

Secondary Compatibility Parameters:

• Mounting Type: Requires Holder (all substitutes require compatible 3AB/3AG holder)
• Approval Agencies: CSA and/or UL certification required
• Operating Temperature Range: -55°C ~ 125°C minimum

All substitute parts listed meet these criteria and are electrically and mechanically interchangeable with the BK/AGC-1/2 in applications requiring 500 mA protection at 250 V AC/DC with fast-blow response characteristics.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation - Eaton Active Alternatives:

For direct replacement of the obsolete BK/AGC-1/2, the active Eaton products BK/AGC-1/2-R, AGC-1/2-R, BK/AGC-1/2KK-R, and BK/AGC-B-1/2 provide identical electrical and mechanical specifications. BK/AGC-1/2-R and AGC-1/2-R carry ROHS3 compliance certification, meeting modern regulatory requirements. These parts maintain the same 500 mA current rating, 250 V voltage rating, fast-blow response, and 3AB/3AG package format.

Secondary Recommendation - Littelfuse Active Alternatives:

The Littelfuse 312 series fuses (0312.500HXP, 0312.500VXP, 0312.500MXP) are active products with identical electrical specifications and ROHS3 compliance. These parts include CE certification in addition to CSA and UL approvals. All three variants meet the 500 mA, 250 V, fast-blow, 3AB/3AG package requirements.

Tertiary Option - SCHURTER Alternative:

The SCHURTER 0001.1021 (SP 6.3x32 series) meets the core electrical specifications but carries obsolete product status. This part is not recommended for new designs despite ROHS3 compliance.

Compliance Considerations:

For applications requiring RoHS compliance, select from: AGC-1/2-R, BK/AGC-1/2-R, 0312.500HXP, 0312.500VXP, or 0312.500MXP. For applications requiring CE certification, select from the Littelfuse 312 series variants.

Frequently Asked Questions (FAQ)

Q: Can the BK/AGC-1/2 be directly replaced with any of the listed substitute parts?

A: Yes. All listed substitute parts meet the critical substitution criteria: 500 mA current rating, 250 V AC voltage rating, fast-blow response time, and 3AB/3AG package format with identical physical dimensions. Direct mechanical and electrical interchangeability is confirmed for all active product alternatives.

Q: What is the difference between BK/AGC-1/2-R and AGC-1/2-R?

A: Both are Eaton active products with identical electrical specifications and ROHS3 compliance. The primary difference is the melting I²t value: AGC-1/2-R has 0.269 while BK/AGC-1/2-R has 0.385. Both are suitable replacements for the obsolete BK/AGC-1/2.

Q: Are the Littelfuse 312 series fuses (0312.500HXP, 0312.500VXP, 0312.500MXP) interchangeable?

A: Yes. All three Littelfuse variants (0312.500HXP, 0312.500VXP, 0312.500MXP) share identical electrical and mechanical specifications. They differ only in packaging or internal construction variants. All are active products with ROHS3 compliance and CE/CSA/UL certifications.

Q: Does the fuse holder need to be changed when substituting parts?

A: No. All substitute parts use the same 3AB/3AG package format (1/4" x 1-1/4") and require the same holder type. Existing 3AB/3AG fuse holders are compatible with all listed alternatives.

Q: What is the significance of the melting I²t parameter?

A: The melting I²t value indicates the thermal energy required to melt the fuse element. While substitute parts may have different I²t values (ranging from 0.13 to 0.483 in this list), all meet the 500 mA fast-blow specification. The I²t difference does not affect interchangeability for standard 500 mA circuit protection applications.

Q: Which substitute part has the highest inventory availability?

A: The Littelfuse 0312.500HXP has the highest inventory with 3,924 pieces in stock, followed by 0312.500MXP with 2,052 pieces.

Q: Is RoHS compliance required for my application?

A: If RoHS compliance is mandatory, select from: AGC-1/2-R, BK/AGC-1/2-R, 0312.500HXP, 0312.500VXP, or 0312.500MXP. The original BK/AGC-1/2 and BK/AGC-B-1/2 are RoHS non-compliant.

Q: Can the SCHURTER 0001.1021 be used as a replacement?

A: The SCHURTER 0001.1021 meets the electrical and mechanical specifications but carries obsolete product status. It is not recommended for new designs. Active alternatives from Eaton or Littelfuse are preferred.

Q: What is the operating temperature range for all substitute parts?

A: All active substitute parts (Eaton and Littelfuse variants) operate across -55°C to 125°C, matching the original BK/AGC-1/2 specification. The SCHURTER 0001.1021 has a narrower range of -40°C to 85°C.