Equivalent & Substitute Parts for BK/S504-160MA

Part Overview

The BK/S504-160MA is a 160 mA, 250 V AC/DC slow-blow glass cartridge fuse in 5mm x 20mm form factor manufactured by Eaton - Electronics Division. This component is classified as obsolete product status. Due to its obsolescence, equivalent and substitute parts from active product lines are necessary to maintain circuit protection functionality in applications requiring 160 mA fusing at 250 V with slow-blow response characteristics. All substitute parts maintain identical electrical ratings, mechanical dimensions, and mounting requirements.

Key Parameters

Parameter	Value
Current Rating	160 mA
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Slow Blow
Package / Case	5mm x 20mm
Mounting Type	Requires Holder
Breaking Capacity @ Rated Voltage	35 A

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following parameters: current rating (160 mA), voltage rating (250 V AC), fuse type (cartridge glass), response time (slow blow), package dimensions (5mm x 20mm), and breaking capacity (35 A). All listed substitute parts meet these criteria. Substitutes are grouped by manufacturer and product series status. Eaton - Electronics Division substitutes represent direct manufacturer alternatives with active product status. SCHURTER Inc. substitutes provide equivalent electrical and mechanical performance from an alternative manufacturer. Melting I²t values vary among substitutes but do not disqualify equivalence when all primary electrical and mechanical parameters align.

Parameter Comparison

Part Number	Manufacturer	Series	Current Rating	Voltage Rating (AC)	Response Time	Package	Breaking Capacity	Product Status	RoHS Status
BK/S504-160MA	Eaton - Electronics Division	S504	160 mA	250 V	Slow Blow	5mm x 20mm	35 A	Obsolete	Non-compliant
BK/S506-160-R	Eaton - Electronics Division	S506	160 mA	250 V	Slow Blow	5mm x 20mm	35 A	Active	ROHS3 Compliant
BK/GDC-160MA	Eaton - Electronics Division	GDC	160 mA	250 V	Slow Blow	5mm x 20mm	35 A	Active	RoHS Compliant
BK1/S506-160-R	Eaton - Electronics Division	S506	160 mA	250 V	Slow Blow	5mm x 20mm	35 A	Active	ROHS3 Compliant
GDC-160MA	Eaton - Electronics Division	GDC	160 mA	250 V	Slow Blow	5mm x 20mm	35 A	Active	RoHS Compliant
S506-160-R	Eaton - Electronics Division	S506	160 mA	250 V	Slow Blow	5mm x 20mm	35 A	Active	ROHS3 Compliant
0034.3109	SCHURTER Inc.	FST 5x20	160 mA	250 V	Slow Blow	5mm x 20mm	35 A	Active	ROHS3 Compliant
0034.3765	SCHURTER Inc.	FSL 5x20	160 mA	250 V	Slow Blow	5mm x 20mm	35 A	Active	ROHS3 Compliant
0034.5035	SCHURTER Inc.	FTT 5x20	160 mA	250 V	Slow Blow	5mm x 20mm	35 A	Active	ROHS3 Compliant
0034.5609.11	SCHURTER Inc.	SMD-FST	160 mA	250 V	Slow Blow	5mm x 20mm	35 A	Active	ROHS3 Compliant
0034.5705.11	SCHURTER Inc.	SMD-FTT	160 mA	250 V	Slow Blow	5mm x 20mm	35 A	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation - Eaton Substitutes: BK/S506-160-R, BK1/S506-160-R, and S506-160-R are direct Eaton - Electronics Division substitutes with active product status and ROHS3 compliance. These parts maintain manufacturer continuity and are recommended for applications requiring certified Eaton components. GDC-160MA and BK/GDC-160MA offer alternative Eaton series with active status and RoHS compliance.

Alternative Manufacturer - SCHURTER Inc. Substitutes: SCHURTER Inc. parts (0034.3109, 0034.3765, 0034.5035, 0034.5609.11, 0034.5705.11) provide equivalent electrical and mechanical performance with active product status and ROHS3 compliance. Selection among SCHURTER series depends on specific approval agency requirements and operating temperature range specifications. All SCHURTER substitutes carry cURus or VDE certifications.

Compliance Consideration: The original BK/S504-160MA is RoHS non-compliant. All substitute parts listed are RoHS compliant (either RoHS or ROHS3), making them suitable for applications subject to RoHS regulations.

Frequently Asked Questions (FAQ)

Q: Can BK/S506-160-R directly replace BK/S504-160MA? A: Yes. Both parts share identical electrical ratings (160 mA, 250 V AC), fuse type (cartridge glass), response time (slow blow), and mechanical dimensions (5mm x 20mm). BK/S506-160-R is active product status, whereas BK/S504-160MA is obsolete.

Q: What is the difference between Eaton S506 and GDC series substitutes? A: Both series meet all electrical and mechanical equivalence criteria. S506 series carries broader approval certifications (BSI, CCC, CSA, IMQ, SEMKO, UR, VDE). GDC series carries cULus or cURus certifications. Selection depends on specific regulatory requirements for the application.

Q: Are SCHURTER parts fully equivalent to Eaton parts? A: SCHURTER parts meet all primary electrical and mechanical parameters: 160 mA current rating, 250 V voltage rating, slow-blow response, 5mm x 20mm package, and 35 A breaking capacity. Approval agencies differ between manufacturers. Verify SCHURTER certifications against application requirements.

Q: Does melting I²t variation affect substitution eligibility? A: Melting I²t values vary among substitutes (ranging from 0.093 to 1.0) but do not disqualify equivalence when all primary electrical and mechanical parameters are identical. I²t is a secondary thermal characteristic; primary substitution criteria are current rating, voltage rating, response time, and package dimensions.

Q: What is the operating temperature range for substitutes? A: Eaton substitutes do not specify operating temperature ranges in provided data. SCHURTER FST series (0034.3109, 0034.5609.11) operate -55°C to 125°C. SCHURTER FSL (0034.3765) and FTT (0034.5035, 0034.5705.11) series operate -40°C to 85°C. Verify temperature requirements for your application.

Q: Are all substitutes available in bulk packaging? A: Yes. All substitute parts listed are available in bulk packaging. Inventory quantities range from 746 to 2533 pieces.

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