BK/AGC-1 Equivalent & Substitute Parts

Part Overview

The BK/AGC-1 is a 1 A, 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 (3AB, 3AG type). The physical dimensions are 0.250" diameter × 1.250" length (6.35 mm × 31.75 mm). Due to its obsolete product status, equivalent and substitute parts from active product lines are available to maintain circuit protection functionality in existing designs and new applications.

Substiute Parts

BK/AGC-1

Eaton - Electronics DivisionIn Stock: 1009BK/AGC-1 Datasheet

Current PartRFQ

AGC-1-R

Eaton - Electronics DivisionIn Stock: 692AGC-1-R Datasheet

DirectRFQ

BK/AGC-1-R

Eaton - Electronics DivisionIn Stock: 1645BK/AGC-1-R Datasheet

DirectRFQ

BK/AGC-B-1-R

Eaton - Electronics DivisionIn Stock: 1154BK/AGC-B-1-R Datasheet

Parametric EquivalentRFQ

0312001.MXP

LittelfuseIn Stock: 201660312001.MXP Datasheet

DirectRFQ

0001.1024

SCHURTER Inc.In Stock: 13410001.1024 Datasheet

SimilarRFQ

0312001.HXP

Littelfuse Inc.In Stock: 378120312001.HXP Datasheet

SimilarRFQ

0312001.TXP

Littelfuse Inc.In Stock: 11770312001.TXP Datasheet

SimilarRFQ

0312001.VXP

Littelfuse Inc.In Stock: 12490312001.VXP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

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

Primary Substitution Criteria:

• Current Rating: 1 A (exact match required)
• Voltage Rating (AC): 250 V (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)
• Physical Dimensions: 0.250" Dia × 1.250" L (exact match required)
• Mounting Type: Requires Holder (exact match required)

Secondary Compatibility Parameters:

• Breaking Capacity @ Rated Voltage: 35 A minimum
• Operating Temperature Range: -55°C ~ 125°C minimum
• Approval Agencies: CSA and/or UL certification required

Substitute parts are classified into two categories:

Direct Manufacturer Equivalents: Parts from Eaton - Electronics Division that share identical electrical and mechanical specifications with the main part. These include AGC-1-R, BK/AGC-1-R, and BK/AGC-B-1-R, all with active product status.

Cross-Manufacturer Equivalents: Parts from Littelfuse Inc. (0312001.MXP, 0312001.HXP, 0312001.TXP, 0312001.VXP) that meet all primary substitution criteria and maintain compatibility with 3AB, 3AG fuse holders.

Similar Parts with Operational Differences: The SCHURTER Inc. part 0001.1024 meets primary substitution criteria but has a different breaking capacity (1.5 kA) and narrower operating temperature range (-40°C ~ 85°C), reflecting its obsolete status.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation - Eaton Direct Equivalents:

The parts AGC-1-R, BK/AGC-1-R, and BK/AGC-B-1-R from Eaton - Electronics Division are direct functional equivalents with active product status. BK/AGC-1-R is the preferred selection due to its ROHS3 compliance certification and highest inventory availability (1597 units). These parts maintain identical electrical characteristics (current, voltage, response time, breaking capacity, melting I²t, and DC cold resistance) to the original BK/AGC-1, ensuring drop-in compatibility in existing circuit designs.

Secondary Recommendation - Littelfuse Cross-Manufacturer Equivalents:

The Littelfuse parts 0312001.MXP, 0312001.HXP, 0312001.TXP, and 0312001.VXP meet all primary substitution criteria and are certified by CSA, UL, CE, KC, and PSE. These parts are functionally equivalent for circuit protection applications. Littelfuse parts exhibit lower melting I²t values (0.76 versus 3.24) and slightly higher DC cold resistance (0.19 Ω versus 0.167 Ω) compared to Eaton parts, reflecting different thermal characteristics within the same fast-blow classification. All Littelfuse variants are ROHS3 compliant and maintain active product status with substantial inventory availability.

Alternative Selection - SCHURTER Part:

The SCHURTER part 0001.1024 meets primary electrical and mechanical substitution criteria but carries obsolete product status. Its significantly higher breaking capacity (1.5 kA versus 35 A) and narrower operating temperature range (-40°C ~ 85°C versus -55°C ~ 125°C) indicate design differences. This part is suitable only for applications where the original BK/AGC-1 inventory is exhausted and no active-status alternatives are available.

Compliance Considerations:

For new designs or applications requiring regulatory compliance, BK/AGC-1-R (ROHS3 compliant, REACH unaffected) or any Littelfuse variant (ROHS3 compliant, REACH unaffected) are appropriate selections. The original BK/AGC-1 is RoHS non-compliant and should not be specified for new applications subject to RoHS regulations.

Frequently Asked Questions (FAQ)

Q: Can I use BK/AGC-1-R as a direct replacement for BK/AGC-1?

A: Yes. BK/AGC-1-R is a direct equivalent with identical electrical and mechanical specifications. The primary difference is active product status and ROHS3 compliance. Both parts are compatible with 3AB and 3AG fuse holders and provide identical circuit protection characteristics.

Q: What is the difference between Eaton and Littelfuse fuses in this category?

A: Both manufacturers produce 1 A, 250 V fast-blow glass cartridge fuses compatible with 3AB, 3AG holders. Littelfuse parts (0312001 series) have lower melting I²t values (0.76 versus 3.24) and slightly higher DC cold resistance (0.19 Ω versus 0.167 Ω). These differences reflect thermal design variations but do not affect functional compatibility for standard circuit protection applications. Both are UL and CSA certified.

Q: Are all substitute parts physically compatible with my existing fuse holder?

A: Yes. All substitute parts listed maintain the 3AB, 3AG package specification and physical dimensions of 0.250" diameter × 1.250" length. They are mechanically compatible with any fuse holder designed for this standard package.

Q: Why does the SCHURTER part have a different breaking capacity?

A: The SCHURTER part 0001.1024 has a breaking capacity of 1.5 kA compared to 35 A for other parts. This reflects a different design approach and is associated with its obsolete product status. The part remains functionally equivalent for circuit protection but should be selected only when active-status alternatives are unavailable.

Q: Which substitute part should I choose for a new design?

A: For new designs, select BK/AGC-1-R (Eaton) or any Littelfuse variant (0312001.MXP, 0312001.HXP, 0312001.TXP, or 0312001.VXP). All are active-status products with ROHS3 compliance. BK/AGC-1-R offers the advantage of identical thermal characteristics to the original part. Littelfuse variants provide equivalent protection with different thermal profiles and broader international certifications (CE, KC, PSE in addition to CSA, UL).

Q: What does "Fast Blow" response time mean?

A: Fast Blow indicates the fuse will open quickly when current exceeds the rated 1 A threshold. This characteristic is consistent across all substitute parts and is appropriate for circuits requiring rapid protection against overcurrent conditions.

Q: Are there any temperature range limitations I should consider?

A: All active-status substitute parts (Eaton and Littelfuse) operate across -55°C ~ 125°C, matching the original BK/AGC-1. The SCHURTER part has a narrower range (-40°C ~ 85°C). For applications requiring the full -55°C ~ 125°C range, avoid the SCHURTER part.

Q: What is the significance of RoHS compliance?

A: RoHS compliance indicates the part does not contain restricted substances (lead, cadmium, mercury, etc.). BK/AGC-1-R and all Littelfuse variants are ROHS3 compliant, making them suitable for applications subject to RoHS regulations. The original BK/AGC-1 is non-compliant and should not be used in new designs requiring regulatory compliance.