BK/AGC-12 Equivalent & Substitute Parts Reference

Part Overview

The BK/AGC-12 is a 12 A, 32 V AC/DC fast-blow glass cartridge fuse manufactured by Eaton Electronics Division. This component is classified as obsolete, requiring identification of active equivalent parts for ongoing circuit protection applications. The fuse operates within a temperature range of -55°C to 125°C and is housed in a 3AB/3AG package format (1/4" × 1-1/4"). Direct substitutes with identical electrical and mechanical specifications are available from both Eaton and Littelfuse manufacturers in active product status.

Substiute Parts

BK/AGC-12

Eaton - Electronics DivisionIn Stock: 716BK/AGC-12 Datasheet

Current PartRFQ

AGC-12-R

Eaton - Electronics DivisionIn Stock: 759AGC-12-R Datasheet

DirectRFQ

BK/AGC-12-R

Eaton - Electronics DivisionIn Stock: 5282BK/AGC-12-R Datasheet

DirectRFQ

0001.1021

SCHURTER Inc.In Stock: 10740001.1021 Datasheet

SimilarRFQ

0312.500HXP

Littelfuse Inc.In Stock: 40160312.500HXP Datasheet

SimilarRFQ

0312.500MXP

Littelfuse Inc.In Stock: 21180312.500MXP Datasheet

SimilarRFQ

0312.500VXP

Littelfuse Inc.In Stock: 10580312.500VXP Datasheet

SimilarRFQ

0312012.HXP

Littelfuse Inc.In Stock: 11720312012.HXP Datasheet

SimilarRFQ

0312012.MXP

Littelfuse Inc.In Stock: 7290312012.MXP Datasheet

SimilarRFQ

0312012.VXP

Littelfuse Inc.In Stock: 8220312012.VXP Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BK/AGC-12 is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

• Current Rating: 12 A (exact match required)
• Voltage Rating: 32 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)
• Size / Dimension: 0.250" Dia × 1.250" L (exact match required)

Direct Equivalents (Eaton Manufacturer):

• AGC-12-R: Active product status, ROHS3 compliant, identical electrical specifications
• BK/AGC-12-R: Active product status, ROHS3 compliant, highest inventory availability (5209 pcs), identical electrical specifications

Direct Equivalents (Littelfuse Manufacturer):

• 0312012.HXP: Active product status, ROHS3 compliant, Breaking Capacity 300A, Melting I²t 234.6
• 0312012.MXP: Active product status, ROHS3 compliant, Breaking Capacity 300A, Melting I²t 234.6
• 0312012.VXP: Active product status, ROHS3 compliant, Breaking Capacity 300A, Melting I²t 234.6

All listed substitutes maintain identical package dimensions, current rating, voltage rating, and response characteristics. Differences in Breaking Capacity and Melting I²t values reflect manufacturer-specific design variations within the 12 A, 32 V fast-blow cartridge fuse category.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: BK/AGC-12-R (Eaton)

The BK/AGC-12-R is the preferred direct substitute for the obsolete BK/AGC-12. This part maintains identical electrical and mechanical specifications, including current rating (12 A), voltage rating (32 V AC), breaking capacity (1 kA), and melting I²t (696.96). The BK/AGC-12-R carries active product status with ROHS3 compliance and REACH unaffected designation. Inventory availability is substantial at 5209 pieces. Approval agencies include CSA and UL, matching the original part's certifications.

Secondary Recommendation: AGC-12-R (Eaton)

The AGC-12-R provides an alternative Eaton solution with identical specifications to BK/AGC-12-R. This part is active, ROHS3 compliant, and carries the same electrical ratings and certifications. Inventory is available at 673 pieces.

Alternative Recommendations: Littelfuse 312 Series (0312012.HXP, 0312012.MXP, 0312012.VXP)

The Littelfuse 312 series parts (0312012.HXP, 0312012.MXP, 0312012.VXP) are functionally equivalent substitutes with identical current rating (12 A), voltage rating (32 V AC), package format (3AB, 3AG), and physical dimensions. All three variants are active products with ROHS3 compliance. These parts feature a higher breaking capacity (300 A versus 1 kA) and lower melting I²t (234.6 versus 696.96), reflecting Littelfuse design specifications. Approval agencies include CSA and either cULus or UL. Inventory availability ranges from 715 to 1084 pieces across the three variants.

Selection Basis:

• Product Status: All recommended substitutes are active products, ensuring long-term availability and supply chain continuity.
• Compliance: All substitutes are ROHS3 compliant, meeting current environmental regulations.
• Certifications: All substitutes carry CSA and UL or cULus approvals, maintaining regulatory compliance with the original part.
• Electrical Equivalence: All substitutes maintain the 12 A current rating and 32 V AC voltage rating required for direct circuit replacement.
• Mechanical Compatibility: All substitutes use the 3AB/3AG package format with identical 1/4" × 1-1/4" dimensions, ensuring holder compatibility.

Frequently Asked Questions (FAQ)

Q: Can the BK/AGC-12-R be used as a direct replacement for the BK/AGC-12?

A: Yes. The BK/AGC-12-R is a direct equivalent substitute. Both parts share identical current rating (12 A), voltage rating (32 V AC), fuse type (cartridge, glass), response time (fast blow), package format (3AB, 3AG), and physical dimensions (0.250" Dia × 1.250" L). The primary difference is product status: BK/AGC-12-R is active while BK/AGC-12 is obsolete.

Q: What is the difference between BK/AGC-12-R and AGC-12-R?

A: Both parts are manufactured by Eaton and share identical electrical and mechanical specifications. The primary difference is packaging: BK/AGC-12-R is supplied in bulk packaging, while AGC-12-R is also supplied in bulk. Both are active products with ROHS3 compliance. Selection between these two should be based on inventory availability and procurement requirements.

Q: Are Littelfuse 312 series parts (0312012.HXP, 0312012.MXP, 0312012.VXP) compatible with the BK/AGC-12?

A: Yes. All three Littelfuse variants are functionally equivalent substitutes. They maintain identical current rating (12 A), voltage rating (32 V AC), fuse type (cartridge, glass), response time (fast blow), package format (3AB, 3AG), and physical dimensions (0.250" Dia × 1.250" L). The parts differ in breaking capacity (300 A versus 1 kA) and melting I²t (234.6 versus 696.96), reflecting manufacturer-specific design variations. All three are active products with ROHS3 compliance and appropriate certifications.

Q: What is the significance of the different breaking capacity values between Eaton and Littelfuse parts?

A: Breaking capacity indicates the maximum current the fuse can safely interrupt at its rated voltage. Eaton BK/AGC-12-R has a breaking capacity of 1 kA, while Littelfuse 312 series parts have 300 A. Both values are within acceptable ranges for 12 A, 32 V AC/DC cartridge fuses. Selection should be based on circuit requirements and system design specifications. Both breaking capacities are suitable for standard industrial and commercial applications using 3AB/3AG fuse holders.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All recommended substitutes (BK/AGC-12-R, AGC-12-R, 0312012.HXP, 0312012.MXP, 0312012.VXP) are ROHS3 compliant. The original BK/AGC-12 is RoHS non-compliant. Substitution with ROHS3 compliant parts ensures compliance with current environmental regulations.

Q: What certifications do the substitute parts carry?

A: All substitute parts carry CSA and UL or cULus approvals. Eaton parts (BK/AGC-12-R, AGC-12-R) are certified by CSA and UL. Littelfuse parts carry CSA certification with either cULus (0312012.HXP, 0312012.MXP) or UL (0312012.VXP). These certifications match or exceed the original BK/AGC-12 certifications (CSA, UL).

Q: Can I use a 500 mA fuse as a substitute for the 12 A BK/AGC-12?

A: No. The 500 mA fuses listed in the reference data (0001.1021, 0312.500HXP, 0312.500MXP, 0312.500VXP) have a current rating of 500 mA, which is fundamentally different from the 12 A rating of BK/AGC-12. Current rating is a critical parameter that cannot be altered. Using an undersized fuse will cause nuisance trips and circuit malfunction. Using an oversized fuse will fail to provide adequate circuit protection.

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

A: All recommended substitute parts operate within the temperature range of -55°C to 125°C, matching the original BK/AGC-12 specification. This range is suitable for industrial, commercial, and consumer applications across standard environmental conditions.

Q: How do I determine which substitute part to order?

A: Selection should follow this priority: (1) BK/AGC-12-R for highest inventory availability and exact Eaton equivalence; (2) AGC-12-R as an alternative Eaton option; (3) Littelfuse 312 series parts (0312012.HXP, 0312012.MXP, 0312012.VXP) for alternative sourcing. All parts are functionally equivalent for direct circuit replacement in 3AB/3AG fuse holders. Verify holder compatibility before installation.