BK/ETF-630MA Equivalent & Substitute Parts

Part Overview

The BK/ETF-630MA is a 630 mA, 277 V AC board mount fuse manufactured by Eaton - Electronics Division. This component is classified as obsolete, indicating it is no longer in active production. The ETF series fuse features a radial, can-style vertical mounting configuration designed for through-hole PCB assembly. Due to its obsolete status, identification of functionally equivalent substitute components is necessary for ongoing maintenance, repair, and new design applications requiring similar electrical and mechanical characteristics.

Substiute Parts

BK/ETF-630MA

Eaton - Electronics DivisionIn Stock: 759BK/ETF-630MA Datasheet

Current PartRFQ

SR-5-630MA-BK

Eaton - Electronics DivisionIn Stock: 1217SR-5-630MA-BK Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BK/ETF-630MA is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

• Current Rating: 630 mA (exact match required)
• Response Time: Slow Blow (thermal-magnetic characteristic)
• Mounting Type: Through Hole
• Package Configuration: Radial, Can, Vertical

Secondary Compatibility Factors:

• Voltage Rating: The substitute must operate at or above the original 277 V AC rating
• Physical Dimensions: Must accommodate existing PCB footprints
• Approval Certifications: Must maintain compliance with applicable standards

The SR-5-630MA-BK substitute part meets the primary electrical criteria (630 mA current rating, slow blow response) and mechanical mounting requirements (through-hole radial can configuration). However, the voltage rating differs at 250 V AC, which represents a lower voltage specification than the original 277 V AC component.

Parameter Comparison

Engineering Selection Recommendations

For Direct Substitution Applications:

The SR-5-630MA-BK is the designated substitute for the obsolete BK/ETF-630MA based on matching current rating (630 mA), response characteristic (slow blow), and mechanical form factor (through-hole radial can). Both components are manufactured by Eaton - Electronics Division and share SEMKO certification.

Voltage Rating Consideration:

The SR-5-630MA-BK operates at 250 V AC, which is lower than the original 277 V AC specification. This substitute is suitable for applications where the circuit voltage does not exceed 250 V AC. For circuits operating at or above 277 V AC, the voltage rating differential must be evaluated against circuit requirements and safety margins.

Certification and Compliance:

The SR-5-630MA-BK holds broader international approvals (CCC, cULus, KC-MARK, SEMKO, VDE) compared to the original component (SEMKO, UL), providing enhanced compliance coverage for global applications. The substitute is RoHS Compliant, whereas the original part status is not specified.

Thermal Operating Range:

The original BK/ETF-630MA supports -55°C to 125°C operation. The SR-5-630MA-BK operates within -40°C to 85°C. Applications requiring operation below -40°C or above 85°C require alternative component selection.

Breaking Capacity:

The original component specifies 100 A breaking capacity at rated voltage, while the substitute provides 35 A. This difference reflects different fault current handling capabilities and must be evaluated for the specific circuit application.

Frequently Asked Questions (FAQ)

Q: Can the SR-5-630MA-BK directly replace the BK/ETF-630MA in all applications?

A: The SR-5-630MA-BK matches the current rating (630 mA), response time (slow blow), and mounting configuration (through-hole radial can). However, the voltage rating is 250 V AC versus 277 V AC on the original. Substitution is valid only for circuits operating at or below 250 V AC. Additionally, the operating temperature range is narrower (-40°C to 85°C versus -55°C to 125°C), which may affect suitability in extreme temperature environments.

Q: What is the significance of the different breaking capacity ratings?

A: Breaking capacity indicates the maximum fault current the fuse can safely interrupt at its rated voltage. The BK/ETF-630MA specifies 100 A breaking capacity, while the SR-5-630MA-BK specifies 35 A. This parameter must align with the maximum prospective short-circuit current in the protected circuit. If the circuit's fault current exceeds 35 A, the substitute component may not provide adequate protection.

Q: Are both components physically compatible with existing PCB footprints?

A: Both components feature radial, can-style vertical mounting for through-hole assembly. The BK/ETF-630MA dimensions are 0.329" Dia x 0.303" H (8.35mm x 7.70mm), while the SR-5-630MA-BK dimensions are 0.335" Dia x 0.319" H (8.50mm x 8.10mm). The substitute is slightly larger in both diameter and height. Verification of PCB footprint clearance is required before substitution.

Q: What certifications apply to the substitute component?

A: The SR-5-630MA-BK holds certifications from CCC, cULus, KC-MARK, SEMKO, and VDE. The original BK/ETF-630MA is certified by SEMKO and UL. The substitute provides broader international compliance coverage and is RoHS Compliant.

Q: How do the melting I²t values differ between the two components?

A: The BK/ETF-630MA specifies a melting I²t of 2.4, while the SR-5-630MA-BK specifies 3.5. The I²t value characterizes the thermal energy required to melt the fuse element. The higher I²t value of the substitute indicates a slightly different thermal response profile, which may affect nuisance trip behavior in circuits with high inrush currents.

Q: Is the substitute component still in active production?

A: Yes, the SR-5-630MA-BK is classified as Active product status with 1135 pieces in stock. The original BK/ETF-630MA is Obsolete, making the substitute the recommended choice for new procurement and ongoing applications.