Equivalent & Substitute Parts for BK1/GMA-7-R

Part Overview

The BK1/GMA-7-R is a 7 A, 125 V AC/DC fast-blow glass cartridge fuse manufactured by Eaton - Electronics Division. This component is designed for use in fuse holders with 5mm x 20mm form factor and is currently in active production status. The fuse provides overcurrent protection in electrical circuits rated up to 125 V AC. Substitute parts are identified when equivalent electrical and mechanical parameters are available from alternative manufacturers, enabling procurement flexibility and supply chain continuity.

Substiute Parts

BK1/GMA-7-R

Eaton - Electronics DivisionIn Stock: 2085BK1/GMA-7-R Datasheet

Current PartRFQ

0235007.MXP

Littelfuse Inc.In Stock: 18660235007.MXP Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BK1/GMA-7-R is determined by strict equivalence across the following critical parameters:

Electrical Parameters:

• Current Rating: 7 A (exact match required)
• Voltage Rating: 125 V AC (exact match required)
• Response Time: Fast Blow (exact match required)

Mechanical Parameters:

• Package / Case: 5mm x 20mm (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Mounting Type: Requires Holder (exact match required)

Compliance Parameters:

• RoHS3 Compliant status (required)
• Product Status: Active (required)

The substitute part 0235007.MXP manufactured by Littelfuse Inc. meets all critical electrical and mechanical parameters. Variations in secondary parameters such as breaking capacity, melting I²t, DC cold resistance, and operating temperature range do not disqualify substitution when primary parameters are equivalent.

Parameter Comparison

Engineering Selection Recommendations

Both the BK1/GMA-7-R and 0235007.MXP are active production components with ROHS3 compliance and UL/PSE certifications. Selection between these parts is based on:

Primary Criteria (Mandatory Equivalence):

• Both parts satisfy identical electrical specifications: 7 A, 125 V AC, fast-blow response
• Both parts are mechanically compatible with 5mm x 20mm fuse holders
• Both parts maintain ROHS3 compliance and active product status

Secondary Criteria (Application-Dependent):

• The 0235007.MXP (Littelfuse) provides higher breaking capacity (10 kA vs. 200 A), suitable for circuits requiring enhanced fault current handling
• The BK1/GMA-7-R (Eaton) provides higher melting I²t (150 vs. 64.815), affecting thermal response characteristics
• Approval agency differences (CSA vs. CE) may influence regional regulatory requirements

Selection should be based on circuit requirements, regional compliance mandates, and supply availability.

Frequently Asked Questions (FAQ)

Q: Can the 0235007.MXP directly replace the BK1/GMA-7-R in existing applications?

A: Yes. Both parts are electrically and mechanically equivalent across all critical parameters: 7 A current rating, 125 V AC voltage rating, fast-blow response, and 5mm x 20mm form factor. Both are compatible with standard 5mm x 20mm fuse holders.

Q: What is the significance of the different breaking capacity ratings (200 A vs. 10 kA)?

A: Breaking capacity indicates the maximum fault current the fuse can safely interrupt. The 0235007.MXP (10 kA) provides higher fault current handling capability. Selection depends on the maximum prospective short-circuit current in the application circuit.

Q: Do the differences in melting I²t affect substitution compatibility?

A: Melting I²t determines the thermal energy required to melt the fuse element. The BK1/GMA-7-R (150) and 0235007.MXP (64.815) have different thermal characteristics. Both are fast-blow fuses rated for 7 A at 125 V, but thermal response may vary slightly under transient conditions. Application-specific thermal analysis may be required for critical circuits.

Q: Are there regional compliance differences between these parts?

A: The BK1/GMA-7-R carries CSA, PSE, and UL approvals. The 0235007.MXP carries CE, PSE, and UL approvals. Both include PSE and UL certifications. Regional requirements may dictate preference based on CSA (North America) or CE (Europe) mandates.

Q: What is the DC cold resistance difference, and does it matter?

A: DC cold resistance is 0.012 Ohms (BK1/GMA-7-R) versus 0.0157 Ohms (0235007.MXP). This minimal difference does not affect circuit operation in standard 125 V AC applications. For DC applications or circuits sensitive to voltage drop, verify compatibility with circuit design specifications.

Q: Are both parts currently available?

A: Yes. Both parts maintain active product status with current inventory: BK1/GMA-7-R (2006 pcs) and 0235007.MXP (1834 pcs).