BK/ETF-100MA Equivalent & Substitute Parts

Part Overview

The BK/ETF-100MA is a 100 mA, 277 V AC/DC board mount fuse with slow blow response characteristics, designed for through-hole radial mounting in vertical orientation. This component is classified as obsolete, necessitating identification of active equivalent parts to maintain design continuity and ensure procurement availability. The fuse is rated for 100 A breaking capacity at rated voltage and operates across a temperature range of -55°C to 125°C.

Substiute Parts

BK/ETF-100MA

Eaton - Electronics DivisionIn Stock: 766BK/ETF-100MA Datasheet

Current PartRFQ

SR-5-100MA-BK

Eaton - Electronics DivisionIn Stock: 828SR-5-100MA-BK Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BK/ETF-100MA is determined by the following critical parameters:

Mandatory Matching Parameters:

• Current Rating: 100 mA (exact match required)
• Fuse Type: Board Mount (Cartridge Style Excluded)
• Mounting Type: Through Hole
• Package / Case: Radial, Can, Vertical
• Response Time: Slow Blow

Voltage Compatibility Consideration: The BK/ETF-100MA operates at 277 V AC. Substitute parts must maintain voltage ratings sufficient for the application circuit. The SR-5-100MA-BK operates at 250 V AC, which represents a lower voltage rating. Substitution is permissible only in applications where the circuit voltage does not exceed 250 V AC.

Physical Compatibility: Both the main part and substitute maintain radial, can, vertical package geometry suitable for through-hole board mounting. Dimensional variations (0.329" Dia x 0.303" H versus 0.335" Dia x 0.319" H) remain within acceptable tolerances for standard through-hole footprints.

Parameter Comparison

Engineering Selection Recommendations

The SR-5-100MA-BK serves as the active equivalent for the obsolete BK/ETF-100MA. Both components are manufactured by Eaton - Electronics Division and share identical current ratings, fuse type, mounting configuration, and response characteristics.

Product Status Consideration: The BK/ETF-100MA is classified as obsolete. The SR-5-100MA-BK maintains active product status, ensuring long-term procurement availability and supply chain continuity.

Compliance and Certification: The SR-5-100MA-BK carries expanded approval agency certifications (CCC, cULus, KC-MARK, SEMKO, VDE) compared to the BK/ETF-100MA (SEMKO, UL), providing broader regulatory acceptance across international markets. The SR-5-100MA-BK is RoHS Compliant, addressing environmental compliance requirements.

Voltage Rating Differential: The SR-5-100MA-BK operates at 250 V AC versus the BK/ETF-100MA at 277 V AC. This represents a 27 V reduction in maximum voltage rating. Substitution is valid only for applications where circuit voltage remains at or below 250 V AC.

Breaking Capacity Differential: The SR-5-100MA-BK has a breaking capacity of 35 A at rated voltage, compared to 100 A for the BK/ETF-100MA. This reduction in breaking capacity must be evaluated against circuit fault current levels to ensure adequate protection margin.

Operating Temperature Range: The SR-5-100MA-BK operates from -40°C to 85°C, compared to -55°C to 125°C for the BK/ETF-100MA. Applications requiring operation below -40°C or above 85°C require alternative solutions.

Frequently Asked Questions (FAQ)

Q: Can the SR-5-100MA-BK directly replace the BK/ETF-100MA in all applications?

A: No. The SR-5-100MA-BK is suitable only for applications where circuit voltage does not exceed 250 V AC, fault current does not exceed 35 A, and operating temperature remains within -40°C to 85°C. Applications requiring 277 V AC operation or higher breaking capacity require alternative components.

Q: What is the significance of the breaking capacity difference between these parts?

A: Breaking capacity defines the maximum fault current a fuse can safely interrupt without rupturing or creating hazardous conditions. The BK/ETF-100MA breaks 100 A at rated voltage, while the SR-5-100MA-BK breaks 35 A. Circuit fault current analysis is required to confirm the SR-5-100MA-BK provides adequate protection margin for the target application.

Q: Are the physical dimensions compatible with existing through-hole footprints?

A: Both components use radial, can, vertical package geometry. The SR-5-100MA-BK dimensions (0.335" Dia x 0.319" H) are slightly larger than the BK/ETF-100MA (0.329" Dia x 0.303" H). Standard through-hole footprints accommodate these dimensional variations. Physical board layout verification is recommended for space-constrained designs.

Q: What certifications apply to the SR-5-100MA-BK?

A: The SR-5-100MA-BK carries certifications from CCC, cULus, KC-MARK, SEMKO, and VDE. It is RoHS Compliant. These certifications provide regulatory acceptance across North American, European, and Asian markets.

Q: How do the melting I²t values differ between these parts?

A: The BK/ETF-100MA has a melting I²t of 0.02, while the SR-5-100MA-BK has 0.015155. Lower I²t values indicate faster thermal response. This difference reflects the different thermal characteristics of each fuse design and should be considered in circuit protection analysis.

Q: Is the SR-5-100MA-BK suitable for high-temperature applications?

A: The SR-5-100MA-BK operates to a maximum of 85°C. Applications requiring operation above 85°C or below -40°C require alternative components. The BK/ETF-100MA supports -55°C to 125°C operation, but its obsolete status limits procurement options.