BK/AGC-7-1/2 Equivalent & Substitute Parts

Part Overview

The BK/AGC-7-1/2 is a 7.5 A, 250 V AC/DC fast-blow glass cartridge fuse in the 3AB/3AG package format (1/4" x 1-1/4"). This fuse requires a compatible holder for installation and is designed for circuit protection applications requiring fast response characteristics. The main part number BK/AGC-7-1/2 carries an obsolete product status. Identifying equivalent and substitute parts is necessary to maintain design continuity and ensure uninterrupted supply for applications currently utilizing this component.

Substiute Parts

BK/AGC-7-1/2

Eaton - Electronics DivisionIn Stock: 1102BK/AGC-7-1/2 Datasheet

Current PartRFQ

AGC-7-1/2-R

Eaton - Electronics DivisionIn Stock: 970AGC-7-1/2-R Datasheet

DirectRFQ

BK/AGC-7-1/2-R

Eaton - Electronics DivisionIn Stock: 1866BK/AGC-7-1/2-R Datasheet

DirectRFQ

BK/AGC-7-1/2NX

Eaton - Electronics DivisionIn Stock: 1028BK/AGC-7-1/2NX Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BK/AGC-7-1/2 is determined by strict equivalence across all electrical and mechanical parameters. The following criteria establish valid substitutes:

Electrical Parameters (Must Match Exactly):

• Current Rating: 7.5 A
• Voltage Rating (AC): 250 V
• Response Time: Fast Blow
• Breaking Capacity @ Rated Voltage: 200 A
• Melting I²t: 216
• DC Cold Resistance: 0.012 Ohms

Mechanical Parameters (Must Match Exactly):

• Fuse Type: Cartridge, Glass
• Package / Case: 3AB, 3AG, 1/4" x 1-1/4"
• Size / Dimension: 0.250" Dia x 1.250" L (6.35mm x 31.75mm)
• Mounting Type: Requires Holder

Certification Parameters (Must Match Exactly):

• Approval Agencies: CSA, UL
• Operating Temperature Range: -55°C ~ 125°C

All substitute parts listed below meet these criteria and are manufactured by Eaton - Electronics Division within the AGC series.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: BK/AGC-7-1/2-R

The BK/AGC-7-1/2-R is the preferred substitute for the obsolete BK/AGC-7-1/2. This part maintains complete electrical and mechanical equivalence while offering the following advantages:

• Active product status ensures ongoing availability and manufacturing support
• ROHS3 compliance satisfies current regulatory requirements
• REACH Unaffected status confirms environmental compliance
• Highest inventory availability (1,775 pcs) among active substitutes
• Bulk packaging format

Secondary Recommendation: AGC-7-1/2-R

The AGC-7-1/2-R provides full electrical and mechanical equivalence with active product status and RoHS compliance. This part is suitable for applications where the specific part number format is not a constraint.

Alternative Recommendation: BK/AGC-7-1/2NX

The BK/AGC-7-1/2NX maintains complete electrical and mechanical equivalence and active product status. This part is suitable for applications where RoHS non-compliance is acceptable or where legacy component specifications are required.

All three substitute parts are manufactured by Eaton - Electronics Division and carry identical electrical performance characteristics, breaking capacity, and thermal ratings as the original BK/AGC-7-1/2.

Frequently Asked Questions (FAQ)

Q: Can AGC-7-1/2-R be used as a direct replacement for BK/AGC-7-1/2?

A: Yes. The AGC-7-1/2-R is electrically and mechanically equivalent to BK/AGC-7-1/2. Both parts share identical current rating (7.5 A), voltage rating (250 V AC), response time (Fast Blow), package format (3AB, 3AG, 1/4" x 1-1/4"), breaking capacity (200 A), and thermal operating range (-55°C ~ 125°C). The primary difference is product status: AGC-7-1/2-R is active while BK/AGC-7-1/2 is obsolete.

Q: What is the difference between BK/AGC-7-1/2-R and BK/AGC-7-1/2NX?

A: Both parts are electrically and mechanically identical with matching current ratings, voltage ratings, response times, package formats, and thermal characteristics. The primary difference is RoHS compliance status: BK/AGC-7-1/2-R is ROHS3 compliant, while BK/AGC-7-1/2NX is RoHS non-compliant. Selection between these parts depends on regulatory requirements for the end application.

Q: Are all substitute parts compatible with existing 3AB/3AG fuse holders?

A: Yes. All substitute parts maintain the identical package format (3AB, 3AG, 1/4" x 1-1/4") and physical dimensions (0.250" Dia x 1.250" L). They are mechanically compatible with any holder designed for the original BK/AGC-7-1/2 fuse.

Q: Does the DC cold resistance specification affect substitution?

A: No. All substitute parts maintain the identical DC cold resistance of 0.012 Ohms as the original BK/AGC-7-1/2. This parameter is held constant across all equivalent parts and does not differentiate substitution options.

Q: What is the significance of the melting I²t value of 216?

A: The melting I²t value of 216 defines the thermal energy required to melt the fuse element and is a critical parameter for circuit protection coordination. All substitute parts maintain this identical value, ensuring equivalent protection characteristics in the circuit.

Q: Can BK/AGC-7-1/2-R be used in applications originally designed for BK/AGC-7-1/2?

A: Yes. The BK/AGC-7-1/2-R is a direct functional equivalent with no electrical or mechanical differences. It provides the same 7.5 A protection at 250 V AC/DC with identical fast-blow response and 200 A breaking capacity. The active product status of BK/AGC-7-1/2-R makes it the recommended choice for new designs and replacements.

Q: Are there any temperature rating differences between the substitute parts?

A: No. All substitute parts maintain the identical operating temperature range of -55°C ~ 125°C as the original BK/AGC-7-1/2. Temperature performance is equivalent across all options.

Q: What certifications do the substitute parts carry?

A: All substitute parts carry CSA and UL approvals, matching the certification profile of the original BK/AGC-7-1/2. These certifications confirm compliance with recognized safety standards for fuse cartridges.