BK/GDA-1.25A Equivalent & Substitute Parts

Part Overview

The BK/GDA-1.25A is a ceramic cartridge fuse rated at 1.25 A, 250 V AC/DC with fast-blow response characteristics. The fuse is housed in a 5mm x 20mm cylindrical ceramic body and requires a compatible fuse holder for installation. This component is classified as Active product status with 704 units in current inventory stock.

Substitute parts are identified when equivalent electrical performance, mechanical compatibility, and safety certifications align with the original specification. Alternative sources provide equivalent current ratings, voltage ratings, breaking capacity, response time, and package dimensions while maintaining interchangeability in holder-based mounting applications.

Substiute Parts

BK/GDA-1.25A

Eaton - Electronics DivisionIn Stock: 716BK/GDA-1.25A Datasheet

Current PartRFQ

BK/S501-1.25-R

Eaton - Electronics DivisionIn Stock: 930BK/S501-1.25-R Datasheet

Parametric EquivalentRFQ

02161.25HXP

Littelfuse Inc.In Stock: 854402161.25HXP Datasheet

DirectRFQ

02161.25MXP

Littelfuse Inc.In Stock: 199002161.25MXP Datasheet

SimilarRFQ

0001.1005

SCHURTER Inc.In Stock: 19240001.1005 Datasheet

Parametric EquivalentRFQ

FCD-1.25A

OptiFuseIn Stock: 3360FCD-1.25A Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following parameters:

Mandatory Equivalence Criteria:

• Current Rating: 1.25 A
• Voltage Rating (AC): 250 V
• Fuse Type: Cartridge, Ceramic
• Response Time: Fast Blow
• Package / Case: 5mm x 20mm
• Breaking Capacity @ Rated Voltage: 1.5 kA
• Mounting Type: Requires Holder

All identified substitute parts meet these criteria. Variations in secondary parameters such as melting I²t, DC cold resistance, operating temperature range, and approval agency certifications do not disqualify substitution eligibility when primary electrical and mechanical parameters remain equivalent.

Parameter Comparison

Engineering Selection Recommendations

All identified substitute parts maintain full electrical and mechanical equivalence to the BK/GDA-1.25A. Selection among alternatives is based on the following factors:

Eaton Series Continuity: The BK/S501-1.25-R maintains manufacturer continuity within the Eaton - Electronics Division product line. This part carries ROHS3 compliance and expanded approval certifications including cULus and MITI/JET, providing broader regulatory coverage than the original GDA series.

Littelfuse 216 Series: Both 02161.25HXP and 02161.25MXP offer the broadest approval agency coverage, including CCC, CE, CSA, KC, PSE, SEMKO, UL, and VDE certifications. These parts specify an operating temperature range of -55°C to 125°C and carry the highest inventory availability at 8481 and 1952 units respectively.

SCHURTER SP 5x20 Series: The 0001.1005 provides parametric equivalence with operating temperature range of -55°C to 125°C and cURus/VDE certifications. This part carries 1851 units in inventory.

OptiFuse FCD Series: The FCD-1.25A provides parametric equivalence with explicit 250 V DC voltage rating specification and IEC 60127 approval. This part carries 3306 units in inventory and maintains MSL 1 (Unlimited) classification.

All substitute parts are classified as Active product status and maintain RoHS3 compliance or equivalent environmental standards.

Frequently Asked Questions (FAQ)

Q: Can the BK/GDA-1.25A be directly replaced with any of the listed substitute parts?

A: Yes. All listed substitute parts meet the mandatory equivalence criteria: 1.25 A current rating, 250 V AC voltage rating, fast-blow response, 5mm x 20mm package dimensions, 1.5 kA breaking capacity, and ceramic cartridge fuse type. Physical installation in existing fuse holders is compatible.

Q: What is the difference between the Eaton GDA and S501 series fuses?

A: Both series are manufactured by Eaton - Electronics Division and meet identical electrical specifications for the 1.25 A, 250 V AC rating. The S501 series carries expanded approval certifications including cULus and MITI/JET. The S501 series is classified as ROHS3 compliant, while the GDA series is RoHS compliant.

Q: Are there differences in melting I²t values among the substitute parts?

A: Yes. Melting I²t values vary: BK/GDA-1.25A (0.313), BK/S501-1.25-R (0.313), 02161.25HXP (0.48), 02161.25MXP (0.48), 0001.1005 (0.538), and FCD-1.25A (0.4489). These variations do not affect substitution eligibility as all parts maintain the same current rating, voltage rating, and fast-blow response time. Melting I²t is a secondary characteristic that describes thermal energy dissipation during fault conditions.

Q: Which substitute part has the widest operating temperature range?

A: The Littelfuse 02161.25HXP, 02161.25MXP, SCHURTER 0001.1005, and OptiFuse FCD-1.25A all specify an operating temperature range of -55°C to 125°C. The Eaton GDA and S501 series do not specify an operating temperature range in the provided data.

Q: What approval certifications are most comprehensive?

A: The Littelfuse 216 series (02161.25HXP and 02161.25MXP) carry the broadest approval agency coverage: CCC, CE, CSA, KC, PSE, SEMKO, UL, and VDE. The original BK/GDA-1.25A carries CCC, SEMKO, and UL certifications.

Q: Is DC voltage rating specified for all substitute parts?

A: The OptiFuse FCD-1.25A explicitly specifies 250 V DC rating. Other parts are rated for 250 V AC/DC operation but do not separately specify DC voltage in the provided data.

Q: Which substitute part has the highest inventory availability?

A: The Littelfuse 02161.25HXP carries the highest inventory with 8481 units in stock, followed by OptiFuse FCD-1.25A with 3306 units.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts carry either RoHS or ROHS3 compliance status. The BK/GDA-1.25A is RoHS Compliant. All other substitute parts are ROHS3 Compliant or carry REACH Unaffected status.