Equivalent & Substitute Parts for BK/GMA-7A Glass Cartridge Fuse

Part Overview

The BK/GMA-7A is a 7 A, 125 V AC/DC fast-blow glass cartridge fuse manufactured by Eaton - Electronics Division. This component is classified as obsolete, requiring identification of active equivalent and substitute parts for continued system support and procurement. The 5mm x 20mm form factor with cartridge-glass construction necessitates holder-based mounting in electrical protection circuits. Equivalent parts maintain identical electrical and mechanical parameters while substitute parts provide functional alternatives within acceptable parameter tolerances for this fuse category.

Substiute Parts

BK/GMA-7A

Eaton - Electronics DivisionIn Stock: 1057BK/GMA-7A Datasheet

Current PartRFQ

BK/GMA-7-R

Eaton - Electronics DivisionIn Stock: 1874BK/GMA-7-R Datasheet

DirectRFQ

GMA-7-R

Eaton - Electronics DivisionIn Stock: 778GMA-7-R Datasheet

Parametric EquivalentRFQ

0235007.MXP

Littelfuse Inc.In Stock: 18660235007.MXP Datasheet

DirectRFQ

BP-GMA-7A

Eaton - Bussmann Electrical DivisionIn Stock: 1101BP-GMA-7A Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete BK/GMA-7A is determined by strict equivalence in the following critical parameters:

Primary Equivalence Criteria:

• Current Rating: 7 A (exact match required)
• Voltage Rating (AC): 125 V (exact match required)
• Package / Case: 5mm x 20mm (exact match required)
• Fuse Type: Cartridge, Glass (exact match required)
• Response Time: Fast Blow (exact match required)
• Mounting Type: Requires Holder (exact match required)

Secondary Compatibility Parameters:

• Breaking Capacity @ Rated Voltage: 200A minimum acceptable
• DC Cold Resistance: ≤0.0157 Ohms acceptable
• Melting I²t: 64.815 to 150 acceptable range

All substitute parts listed maintain identical primary equivalence criteria. Variations in breaking capacity, resistance, and melting I²t remain within acceptable operational tolerances for this fuse category and do not affect holder compatibility or circuit protection function.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: BK/GMA-7-R

The BK/GMA-7-R is the direct manufacturer equivalent from Eaton - Electronics Division. This part maintains identical electrical parameters (7 A, 125 V, 200A breaking capacity, 0.012 Ohms DC cold resistance, 150 melting I²t) and mechanical specifications (5mm x 20mm cartridge glass form factor). Product status is active with 1806 units in stock. RoHS3 compliance and CSA, PSE, UL certifications support modern procurement requirements. Bulk packaging is available.

Secondary Recommendation: GMA-7-R

The GMA-7-R is a parametric equivalent from Eaton - Electronics Division with identical electrical and mechanical specifications to BK/GMA-7-R. Product status is active with 724 units in stock. RoHS compliance and CSA, PSE, UL certifications are maintained. This part represents an alternative within the same manufacturer family.

Tertiary Recommendation: 0235007.MXP

The 0235007.MXP from Littelfuse Inc. (Series 235) maintains all primary equivalence criteria. Breaking capacity is elevated to 10kA, providing enhanced protection margin. DC cold resistance is 0.0157 Ohms and melting I²t is 64.815, both within acceptable operational tolerances. Product status is active with 1834 units in stock. ROHS3 compliance and CE, PSE, UL certifications are provided. Operating temperature range is specified as -55°C to 125°C.

Quaternary Recommendation: BP-GMA-7A

The BP-GMA-7A from Eaton - Bussmann Electrical Division maintains all primary equivalence criteria with 200A breaking capacity. Product status is active with 1062 units in stock. CSA, UL, UR certifications are provided. This part represents an alternative within the Eaton corporate family.

Selection Priority:

1. BK/GMA-7-R for direct manufacturer continuity and maximum parameter alignment
2. GMA-7-R for equivalent performance within Eaton product line
3. 0235007.MXP for cross-manufacturer compatibility with enhanced breaking capacity
4. BP-GMA-7A for alternative Eaton division sourcing

Frequently Asked Questions (FAQ)

Q: Can BK/GMA-7A be directly replaced with BK/GMA-7-R?

A: Yes. BK/GMA-7-R is the direct active equivalent. Both parts share identical current rating (7 A), voltage rating (125 V AC), fuse type (cartridge glass), response time (fast blow), package dimensions (5mm x 20mm), and electrical parameters (200A breaking capacity, 0.012 Ohms DC cold resistance, 150 melting I²t). Holder compatibility is maintained.

Q: What is the difference between BK/GMA-7-R and GMA-7-R?

A: Both parts are manufactured by Eaton - Electronics Division and maintain identical electrical and mechanical specifications. The primary difference is part numbering convention. Both are active products with equivalent performance characteristics and holder compatibility.

Q: Can 0235007.MXP from Littelfuse be used as a substitute?

A: Yes. The 0235007.MXP maintains all primary equivalence criteria: 7 A current rating, 125 V AC voltage rating, 5mm x 20mm cartridge glass form factor, fast-blow response, and holder-based mounting. Breaking capacity is 10kA (higher than Eaton 200A), and melting I²t is 64.815 (lower than Eaton 150). Both variations remain within acceptable operational tolerances for this fuse category. Operating temperature range is -55°C to 125°C.

Q: Are there RoHS compliance differences between substitute parts?

A: BK/GMA-7A is RoHS non-compliant. All active substitute parts (BK/GMA-7-R, GMA-7-R, 0235007.MXP) are RoHS3 compliant or RoHS compliant, supporting modern procurement and environmental regulations.

Q: What certifications are required for this fuse category?

A: All substitute parts carry UL certification. BK/GMA-7-R and GMA-7-R include CSA and PSE certifications. 0235007.MXP includes CE and PSE certifications. BP-GMA-7A includes CSA and UR certifications. Selection should align with specific system certification requirements.

Q: Can these fuses be used interchangeably in the same holder?

A: Yes. All substitute parts maintain identical 5mm x 20mm cartridge glass dimensions and holder-based mounting requirements. Physical and electrical compatibility with standard 5mm x 20mm fuse holders is maintained across all listed parts.

Q: What is the significance of melting I²t and DC cold resistance variations?

A: Melting I²t and DC cold resistance determine fuse response characteristics and heat dissipation. Eaton parts specify 150 melting I²t and 0.012 Ohms resistance. Littelfuse 0235007.MXP specifies 64.815 melting I²t and 0.0157 Ohms resistance. These variations remain within acceptable operational tolerances for 7 A, 125 V fast-blow cartridge fuses and do not affect circuit protection function or holder compatibility.

Q: Which substitute part has the highest inventory availability?

A: 0235007.MXP (Littelfuse) has 1834 units in stock, followed by BK/GMA-7-R (Eaton) with 1806 units, BP-GMA-7A (Eaton Bussmann) with 1062 units, and GMA-7-R (Eaton) with 724 units.