Equivalent & Substitute Parts for BK/AGC-3 Glass Cartridge Fuse

Part Overview

The BK/AGC-3 is a 3 A, 250 V AC/DC fast-blow glass cartridge fuse manufactured by Eaton Electronics Division. This component is classified as obsolete, though 927 pieces remain in stock. The fuse requires a 3AB or 3AG holder and is housed in a 1/4" × 1-1/4" (6.35 mm × 31.75 mm) cylindrical glass package. Due to its obsolete status, equivalent and substitute parts from active product lines are necessary for ongoing system maintenance and new designs requiring identical electrical and mechanical performance.

Substiute Parts

BK/AGC-3

Eaton - Electronics DivisionIn Stock: 967BK/AGC-3 Datasheet

Current PartRFQ

AGC-3-R

Eaton - Electronics DivisionIn Stock: 882AGC-3-R Datasheet

DirectRFQ

BK/AGC-3-R

Eaton - Electronics DivisionIn Stock: 6667BK/AGC-3-R Datasheet

DirectRFQ

BK/AGC-3YY-R

Eaton - Electronics DivisionIn Stock: 1051BK/AGC-3YY-R Datasheet

Parametric EquivalentRFQ

BK/AGC-B-3

Eaton - Electronics DivisionIn Stock: 809BK/AGC-B-3 Datasheet

Parametric EquivalentRFQ

0312003.MXP

Littelfuse Inc.In Stock: 123840312003.MXP Datasheet

SimilarRFQ

0312003.VXP

Littelfuse Inc.In Stock: 7420312003.VXP Datasheet

SimilarRFQ

0312003.HXP

Littelfuse Inc.In Stock: 14750312003.HXP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the BK/AGC-3 is determined by strict equivalence across the following critical parameters:

Electrical Parameters:

• Current Rating: 3 A (exact match required)
• Voltage Rating: 250 V AC (exact match required)
• Response Time: Fast Blow (exact match required)
• Breaking Capacity: 100 A (exact match required)

Mechanical Parameters:

• Package / Case: 3AB, 3AG, 1/4" × 1-1/4" (exact match required)
• Mounting Type: Requires Holder (exact match required)

Environmental Parameters:

• Operating Temperature Range: -55°C to 125°C (exact match required)

All substitute parts listed below meet these criteria. Variations in melting I²t, DC cold resistance, RoHS compliance status, and manufacturer identity do not disqualify substitution when all electrical and mechanical parameters are identical.

Parameter Comparison

Engineering Selection Recommendations

For Active Product Line Replacement:

When the BK/AGC-3 (obsolete) must be replaced in active designs or maintenance applications, select from the Eaton active alternatives: AGC-3-R, BK/AGC-3-R, BK/AGC-3YY-R, or BK/AGC-B-3. All four parts are electrically and mechanically identical to the original and are currently in production.

For RoHS3 Compliance Requirements:

If the application requires RoHS3 compliance, use AGC-3-R, BK/AGC-3-R, 0312003.HXP, 0312003.VXP, or 0312003.MXP. These parts carry ROHS3 Compliant certification.

For Non-Compliant Applications:

If RoHS compliance is not required, BK/AGC-B-3 (Eaton) is available as an active alternative with RoHS non-compliant status, matching the original BK/AGC-3 compliance profile.

For Cross-Manufacturer Substitution:

Littelfuse 312 series parts (0312003.HXP, 0312003.VXP, 0312003.MXP) are parametrically equivalent and carry expanded approval certifications (CE, CSA, KC, PSE, UL). These are suitable for applications requiring multi-regional compliance.

Inventory Availability:

BK/AGC-3-R (6,557 pieces) and 0312003.MXP (12,307 pieces) offer the highest stock levels for immediate procurement.

Frequently Asked Questions (FAQ)

Q: Can AGC-3-R be used as a direct replacement for BK/AGC-3?

A: Yes. AGC-3-R is electrically and mechanically identical to BK/AGC-3. Both are 3 A, 250 V AC/DC fast-blow fuses in 3AB/3AG 1/4" × 1-1/4" packages. AGC-3-R is an active product with ROHS3 compliance.

Q: What is the difference between BK/AGC-3-R and AGC-3-R?

A: Both parts are manufactured by Eaton and are electrically and mechanically identical. The difference is in the part number designation. BK/AGC-3-R has higher inventory availability (6,557 pieces vs. 848 pieces).

Q: Are Littelfuse 312 series fuses compatible with 3AB and 3AG holders?

A: Yes. Littelfuse 0312003.HXP, 0312003.VXP, and 0312003.MXP are all specified for 3AB and 3AG holders with identical 1/4" × 1-1/4" dimensions. They are mechanically and electrically compatible.

Q: Does the melting I²t value affect substitution compatibility?

A: No. The melting I²t value (45.9 for Eaton parts, 14 for Littelfuse parts) reflects internal fuse element design but does not affect substitution when all electrical parameters (current, voltage, response time, breaking capacity) are identical.

Q: Which substitute part has the best RoHS compliance status?

A: All Littelfuse parts (0312003.HXP, 0312003.VXP, 0312003.MXP) and Eaton parts AGC-3-R and BK/AGC-3-R carry ROHS3 Compliant certification. BK/AGC-B-3 and the original BK/AGC-3 are RoHS non-compliant.

Q: Can I use BK/AGC-3YY-R in place of BK/AGC-3?

A: Yes. BK/AGC-3YY-R is electrically and mechanically identical and is an active product. RoHS status is not specified in the data provided, but all other parameters match exactly.

Q: What certifications do the Littelfuse alternatives carry?

A: Littelfuse 312 series parts carry CE, CSA, KC, PSE, and UL approvals, providing broader regional certification coverage than the original BK/AGC-3 (CSA, UL only).

Q: Is the DC cold resistance difference between manufacturers significant?

A: No. Eaton parts specify 0.035 Ohms; Littelfuse parts specify 0.0427 Ohms. Both values are within acceptable ranges for 3 A cartridge fuses and do not affect substitution compatibility.