BK/ETF-1.6 Board Mount Fuse Equivalent & Substitute Parts

Part Overview

The BK/ETF-1.6 is a 1.6 A, 277 V AC board mount fuse manufactured by Eaton - Electronics Division. This component is classified as obsolete, which necessitates identification of equivalent substitute parts for ongoing design support and procurement. The fuse features slow blow response characteristics and is designed for through-hole radial mounting in vertical orientation. Due to its obsolete status, alternative parts with compatible electrical and mechanical specifications are required for system continuity.

Substiute Parts

BK/ETF-1.6

Eaton - Electronics DivisionIn Stock: 1119BK/ETF-1.6 Datasheet

Current PartRFQ

SR-5-1.6A-BK

Eaton - Electronics DivisionIn Stock: 821SR-5-1.6A-BK Datasheet

SimilarRFQ

0034.6617

SCHURTER Inc.In Stock: 92750034.6617 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BK/ETF-1.6 is determined by the following critical parameters:

Primary Compatibility Criteria:

• Current Rating: 1.6 A (exact match required)
• Fuse Type: Board Mount, Through Hole, Radial orientation
• Response Time: Slow Blow
• Package / Case: Radial, Can, Vertical

Secondary Compatibility Criteria:

• Voltage Rating - AC: Minimum 277 V (substitute must equal or exceed)
• Mounting dimensions: Physical compatibility with 0.329" Dia x 0.303" H footprint
• Operating Temperature: -55°C ~ 125°C range support

The identified substitute parts SR-5-1.6A-BK and 0034.6617 share identical current ratings, fuse types, and mounting configurations. However, both substitutes operate at reduced AC voltage ratings (250 V), which represents a functional limitation when the original 277 V specification is required. The 0034.6617 provides dual voltage capability (250 V AC / 125 V DC) and extended temperature range matching the original part.

Parameter Comparison

Engineering Selection Recommendations

For 277 V AC Applications: The BK/ETF-1.6 operates at 277 V AC. Neither substitute part (SR-5-1.6A-BK nor 0034.6617) is rated for 277 V AC operation; both are limited to 250 V AC maximum. Direct substitution at the original 277 V specification is not supported by the available alternatives. Applications requiring 277 V AC operation must retain the original BK/ETF-1.6 specification or source equivalent parts rated for 277 V AC.

For 250 V AC or Lower Applications: If system voltage can be reduced to 250 V AC or lower, both substitute parts are electrically compatible:

• SR-5-1.6A-BK (Eaton - Electronics Division): Active product status with expanded regulatory approvals (CCC, cULus, KC-MARK, PSE, SEMKO, VDE). Operating temperature range is reduced to -40°C ~ 85°C. Breaking capacity is reduced to 35 A. Melting I²t increased to 24. Physical dimensions slightly larger (0.335" Dia x 0.319" H). RoHS Compliant.

• 0034.6617 (SCHURTER Inc.): Active product status with dual voltage capability (250 V AC / 125 V DC). Operating temperature range matches original (-55°C ~ 125°C). Breaking capacity 35 A AC / 50 A DC. Melting I²t increased to 30. Physical dimensions slightly larger (0.335" Dia x 0.335" H). ROHS3 Compliant. REACH Unaffected status provided.

Compliance Considerations: Both substitute parts carry active product status and expanded regulatory certifications compared to the obsolete BK/ETF-1.6. The 0034.6617 provides superior environmental compliance documentation (REACH status) and maintains the full operating temperature range of the original part.

Frequently Asked Questions (FAQ)

Q: Can SR-5-1.6A-BK or 0034.6617 be used as direct replacements for BK/ETF-1.6 in 277 V AC circuits?

A: No. Both substitute parts are rated for 250 V AC maximum. The BK/ETF-1.6 is rated for 277 V AC. Using a 250 V rated fuse in a 277 V circuit exceeds the component's voltage specification and is not supported.

Q: What is the physical compatibility between the main part and substitutes?

A: The BK/ETF-1.6 measures 0.329" Dia x 0.303" H. Both substitutes measure 0.335" Dia x 0.319" H (SR-5-1.6A-BK) or 0.335" Dia x 0.335" H (0034.6617). The substitutes are slightly larger in diameter and height. Board layout and mounting hole spacing must be verified for mechanical fit.

Q: Why is the breaking capacity lower in the substitute parts?

A: The BK/ETF-1.6 has a breaking capacity of 100 A at rated voltage. Both substitutes have 35 A breaking capacity at rated voltage. This represents a functional difference in fault current handling capability. Circuit protection requirements must be evaluated against the reduced breaking capacity.

Q: Which substitute part is recommended for applications requiring both AC and DC operation?

A: The 0034.6617 is the only substitute with dual voltage rating (250 V AC / 125 V DC). The SR-5-1.6A-BK does not specify DC voltage capability.

Q: Are the substitute parts RoHS compliant?

A: Yes. SR-5-1.6A-BK is RoHS Compliant. 0034.6617 is ROHS3 Compliant. The original BK/ETF-1.6 does not specify RoHS status.

Q: What is the temperature operating range difference?

A: The BK/ETF-1.6 operates from -55°C ~ 125°C. The SR-5-1.6A-BK operates from -40°C ~ 85°C (reduced range). The 0034.6617 operates from -55°C ~ 125°C (matches original). Applications requiring full -55°C ~ 125°C operation should use 0034.6617.

Q: Can these parts be used interchangeably in the same circuit board design?

A: Physical dimensions differ slightly. Mechanical fit must be verified before design implementation. Electrical specifications (voltage, current, breaking capacity) must be confirmed compatible with circuit requirements before substitution.