Equivalent & Substitute Parts for BK/AGC-3/10 Glass Cartridge Fuse

Part Overview

The BK/AGC-3/10 is a 300 mA, 250 V AC/DC fast-blow glass cartridge fuse manufactured by Eaton - Electronics Division. This component is classified as obsolete, requiring identification of active equivalent alternatives for continued system support and procurement. The fuse operates within a temperature range of -55°C to 125°C and is designed for 3AB and 3AG holder compatibility with standard 1/4" x 1-1/4" dimensions. Equivalent substitutes must maintain identical electrical ratings, mechanical form factors, and approval certifications to ensure direct interchangeability without circuit redesign.

Substiute Parts

BK/AGC-3/10

Eaton - Electronics DivisionIn Stock: 907BK/AGC-3/10 Datasheet

Current PartRFQ

AGC-3/10-R

Eaton - Electronics DivisionIn Stock: 1204AGC-3/10-R Datasheet

DirectRFQ

BK/AGC-3/10-R

Eaton - Electronics DivisionIn Stock: 782BK/AGC-3/10-R Datasheet

DirectRFQ

0312.300HXCCP

Littelfuse Inc.In Stock: 11680312.300HXCCP Datasheet

SimilarRFQ

0312.300MXCCP

Littelfuse Inc.In Stock: 11020312.300MXCCP Datasheet

SimilarRFQ

0312.300MXP

Littelfuse Inc.In Stock: 10400312.300MXP Datasheet

SimilarRFQ

0312.300VXP

Littelfuse Inc.In Stock: 11390312.300VXP Datasheet

SimilarRFQ

0312.300HXP

Littelfuse Inc.In Stock: 10880312.300HXP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the BK/AGC-3/10 is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Current Rating: 300 mA (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" x 1-1/4" (exact match required)
• Size / Dimension: 0.250" Dia x 1.250" L (exact match required)
• Breaking Capacity @ Rated Voltage: 35A (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)

Acceptable Variation Parameters:

• Melting I²t: Variation permitted within engineering tolerance (0.027 to 0.0689)
• DC Cold Resistance: Variation permitted (1.084 to 1.405 Ohms)
• RoHS Status: Upgrade from non-compliant to compliant acceptable
• Approval Agencies: Equivalent or expanded certifications acceptable (CSA/UL to CE/CSA/UL)

All substitute parts listed below satisfy mandatory parameter equivalence and are therefore direct functional replacements for the obsolete BK/AGC-3/10.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: BK/AGC-3/10-R (Eaton - Electronics Division)

The BK/AGC-3/10-R is the direct active equivalent manufactured by the original equipment supplier. This part maintains identical electrical characteristics (300 mA, 250 V, 0.027 Melting I²t, 1.084 Ω DC Cold Resistance) and mechanical form factor to the obsolete BK/AGC-3/10. The upgrade to ROHS3 compliance and active product status ensures long-term availability and supply chain continuity. Approval certifications remain equivalent (CSA, UL). This selection eliminates cross-manufacturer compatibility concerns and maintains original design intent.

Secondary Recommendation: AGC-3/10-R (Eaton - Electronics Division)

The AGC-3/10-R provides identical electrical and mechanical specifications with active product status and RoHS compliance. This variant offers equivalent performance with the same manufacturer heritage and certification profile.

Alternative Recommendation: Littelfuse 0312 Series (0312.300VXP, 0312.300MXP, 0312.300HXCCP, 0312.300MXCCP, 0312.300HXP)

All Littelfuse 0312 series parts meet mandatory electrical and mechanical equivalence criteria. These alternatives feature expanded approval certifications (CE, CSA, UL) and ROHS3 compliance. Melting I²t variation (0.0689 versus 0.027) and DC Cold Resistance variation (1.405 versus 1.084 Ohms) fall within acceptable engineering tolerance for this fuse category. Selection among 0312 variants should be based on packaging availability and inventory requirements, as all variants are functionally equivalent.

Selection Priority:

1. BK/AGC-3/10-R (original manufacturer, identical specifications)
2. AGC-3/10-R (original manufacturer, identical specifications)
3. Littelfuse 0312 series (cross-manufacturer equivalent, expanded certifications)

Frequently Asked Questions (FAQ)

Q: Can the BK/AGC-3/10 be directly replaced with any of the listed substitutes?

A: Yes. All listed substitute parts satisfy mandatory parameter equivalence across current rating (300 mA), voltage rating (250 V), fuse type (cartridge glass), response time (fast blow), package dimensions (3AB, 3AG, 1/4" x 1-1/4"), and breaking capacity (35A). Direct substitution is supported without circuit modification.

Q: What is the difference between BK/AGC-3/10-R and AGC-3/10-R?

A: Both parts are manufactured by Eaton - Electronics Division and maintain identical electrical and mechanical specifications. The primary difference is packaging designation. Both are active products with RoHS compliance and equivalent approval certifications (CSA, UL). Selection between these variants should be based on part number availability and procurement requirements.

Q: Why do Littelfuse 0312 series parts show different Melting I²t and DC Cold Resistance values?

A: Littelfuse 0312 series parts exhibit Melting I²t of 0.0689 and DC Cold Resistance of 1.405 Ohms, compared to 0.027 and 1.084 Ohms for Eaton parts. These variations are within acceptable engineering tolerance for 300 mA, 250 V fast-blow glass cartridge fuses and do not affect functional interchangeability. Both parameter sets satisfy the electrical performance requirements of this fuse category.

Q: Are Littelfuse 0312 series parts fully compatible with 3AB and 3AG holders?

A: Yes. All Littelfuse 0312 series parts maintain identical physical dimensions (0.250" Dia x 1.250" L / 6.35mm x 31.75mm) and package designation (3AB, 3AG, 1/4" x 1-1/4"). Mechanical compatibility with standard 3AB and 3AG fuse holders is confirmed.

Q: What is the significance of ROHS3 compliance versus RoHS compliance?

A: ROHS3 represents the current regulatory standard for restriction of hazardous substances. Both designations indicate RoHS compliance; ROHS3 reflects the most recent regulatory iteration. Parts marked ROHS3 Compliant meet current environmental and material restriction requirements and are suitable for new designs and legacy system support.

Q: Do all substitute parts carry the same approval certifications as the original BK/AGC-3/10?

A: The original BK/AGC-3/10 carries CSA and UL approvals. Eaton substitute parts (BK/AGC-3/10-R and AGC-3/10-R) maintain identical certifications. Littelfuse 0312 series parts carry expanded certifications (CE, CSA, UL), which represent equivalent or superior approval coverage for this component category.

Q: Can I mix Eaton and Littelfuse fuses in the same circuit or system?

A: Yes. All listed parts meet identical mandatory electrical and mechanical specifications. However, for system consistency and supply chain management, it is preferable to standardize on a single manufacturer within a given application or product line.

Q: What inventory levels are available for each substitute part?

A: Current inventory levels are provided in the parameter comparison table. BK/AGC-3/10-R (750 Pcs), AGC-3/10-R (1132 Pcs), and Littelfuse 0312 series variants (1024-1152 Pcs) are all in stock as new original components. Inventory status should be confirmed at time of procurement.