Equivalent & Substitute Parts for BK/AGC-B-1/4 Glass Cartridge Fuse

Part Overview

The BK/AGC-B-1/4 is a 250 mA, 250 V AC/DC fast-blow glass cartridge fuse manufactured by Eaton Electronics Division. This component is classified as obsolete and requires a fuse holder for installation. The 3AB/3AG package format (1/4" × 1-1/4") is a standard industrial fuse configuration. Due to its obsolete status, direct replacement with active production equivalents is necessary for new designs and ongoing maintenance applications.

Substiute Parts

BK/AGC-B-1/4

Eaton - Electronics DivisionIn Stock: 954BK/AGC-B-1/4 Datasheet

Current PartRFQ

AGC-1/4-R

Eaton - Electronics DivisionIn Stock: 799AGC-1/4-R Datasheet

Parametric EquivalentRFQ

BK/AGC-1/4-R

Eaton - Electronics DivisionIn Stock: 1308BK/AGC-1/4-R Datasheet

Parametric EquivalentRFQ

0318.250HXP

Littelfuse Inc.In Stock: 10640318.250HXP Datasheet

DirectRFQ

0312.250HXCCP

Littelfuse Inc.In Stock: 9690312.250HXCCP Datasheet

Parametric EquivalentRFQ

0312.250HXP

Littelfuse Inc.In Stock: 30250312.250HXP Datasheet

Parametric EquivalentRFQ

0312.250MXCCP

Littelfuse Inc.In Stock: 9570312.250MXCCP Datasheet

Parametric EquivalentRFQ

0312.250MXP

Littelfuse Inc.In Stock: 106860312.250MXP Datasheet

Parametric EquivalentRFQ

0312.250VXP

Littelfuse Inc.In Stock: 11210312.250VXP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the BK/AGC-B-1/4 is determined by strict equivalence across the following parameters:

Primary Substitution Criteria:

• Current Rating: 250 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" × 1-1/4" (exact match required)
• Mounting Type: Requires Holder (exact match required)
• Breaking Capacity: 35 A (exact match required)

Secondary Compatibility Factors:

• Operating Temperature Range: -55°C to 125°C (must encompass or equal)
• Approval Agencies: CSA, UL certification (must include both or equivalent)

All substitute parts listed below meet these criteria. Eaton AGC-1/4-R and BK/AGC-1/4-R are direct Eaton equivalents with active product status. Littelfuse 312 and 318 series parts provide cross-manufacturer alternatives with identical electrical and mechanical specifications.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: Eaton BK/AGC-1/4-R

The BK/AGC-1/4-R is the direct active-production equivalent from the original manufacturer. It maintains identical electrical and mechanical specifications to the obsolete BK/AGC-B-1/4 while offering ROHS3 compliance and REACH unaffected status. This part is certified by CSA and UL and is available in bulk packaging with 1226 units in stock.

Secondary Recommendation: Eaton AGC-1/4-R

The AGC-1/4-R provides an alternative Eaton solution with RoHS compliance and active product status. Electrical and mechanical parameters are identical to the original part. This option is available with 745 units in stock.

Cross-Manufacturer Alternatives: Littelfuse 312 Series

The Littelfuse 0312.250HXP, 0312.250MXP, and 0312.250VXP parts are parametric equivalents with identical current, voltage, response time, and package specifications. All three are ROHS3 compliant and certified by CE, CSA, and UL. The 0312.250MXP variant has the highest inventory availability at 10,583 units. These parts are suitable for direct substitution in holder-based installations.

Note on Littelfuse 0318.250HXP

The 0318.250HXP differs in mounting type (Through Hole vs. Requires Holder) and physical dimensions (0.275" Dia × 1.288" L vs. 0.250" Dia × 1.250" L). This part is not suitable for direct substitution in existing BK/AGC-B-1/4 holder assemblies.

Frequently Asked Questions (FAQ)

Q: Can I use the Littelfuse 0318.250HXP as a direct replacement for the BK/AGC-B-1/4?

A: No. The 0318.250HXP has a different mounting type (Through Hole) and different physical dimensions. It is not compatible with 3AB/3AG fuse holders designed for the BK/AGC-B-1/4. Use only parts with "Requires Holder" mounting type and 1/4" × 1-1/4" dimensions.

Q: What is the difference between the Littelfuse 0312.250HXP, 0312.250MXP, and 0312.250VXP?

A: These three parts are parametric equivalents with identical electrical and mechanical specifications. The designations (HXP, MXP, VXP) represent different internal construction or certification variants within the Littelfuse 312 series. All three are suitable for substitution based on provided parameters.

Q: Is the obsolete BK/AGC-B-1/4 still available for purchase?

A: The BK/AGC-B-1/4 is classified as obsolete. However, 894 units are currently in stock. For new designs and long-term availability, use the active-status equivalents: BK/AGC-1/4-R, AGC-1/4-R, or Littelfuse 312 series parts.

Q: Do all substitute parts have the same approval certifications?

A: The original BK/AGC-B-1/4 is certified by CSA and UL. All recommended substitutes (Eaton AGC-1/4-R, BK/AGC-1/4-R, and Littelfuse 312 series) maintain CSA and UL certification. Littelfuse parts also include CE certification.

Q: What is the difference in RoHS compliance between the original and substitute parts?

A: The BK/AGC-B-1/4 is RoHS non-compliant. All active-status substitutes (AGC-1/4-R, BK/AGC-1/4-R, and Littelfuse 312 series) are ROHS3 compliant, meeting current environmental regulations.

Q: Can I mix different substitute part numbers in the same application?

A: Yes. All recommended substitute parts meet identical electrical and mechanical specifications for the 250 mA, 250 V AC/DC fast-blow cartridge fuse category. They are interchangeable within holder-based installations.