Equivalent & Substitute Parts for BK/S506-1A

Part Overview

The BK/S506-1A is a 1 A, 250 V AC/DC glass cartridge fuse with a 5mm x 20mm form factor manufactured by Eaton - Electronics Division. This component is classified as obsolete and requires a fuse holder for installation. Due to its obsolete product status, equivalent and substitute parts from active product lines are necessary for ongoing system maintenance, repairs, and new designs requiring compatible fuse protection.

Key Parameters

Parameter	Value
Current Rating	1 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Package / Case	5mm x 20mm
Response Time	Slow Blow
Mounting Type	Requires Holder
Breaking Capacity @ Rated Voltage	35 A
Size / Dimension	0.205" Dia x 0.787" L (5.20mm x 20.00mm)

Substitute Part Grouping Explanation

Substitution of the BK/S506-1A is determined by strict equivalence across the following critical parameters:

Current Rating: 1 A (exact match required)
Voltage Rating (AC): 250 V (exact match required)
Package / Case: 5mm x 20mm (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Response Time: Slow Blow (exact match required)
Mounting Type: Requires Holder (exact match required)

Substitute parts are grouped into two categories:

Direct Manufacturer Equivalents (Eaton - Electronics Division): Parts from the same manufacturer with identical electrical and mechanical specifications, differing only in series designation or packaging format. These include BK/S506-1-R, BK/GDC-1A, BK/GMD-1-R, BK1/GMD-1-R, BK1/S506-1-R-R, GDC-1A, GMD-1-R, and S506-1-R.

Cross-Manufacturer Equivalents: Parts from alternative manufacturers (SCHURTER Inc., Littelfuse Inc.) that meet identical electrical and mechanical specifications and are compatible with the same fuse holder installations.

Parameter Comparison

Part Number	Manufacturer	Current Rating (A)	Voltage Rating (V AC)	Package	Response Time	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ohms)	Product Status	RoHS Status
BK/S506-1A	Eaton	1	250	5x20mm	Slow Blow	35	2.7	0.062	Obsolete	Non-compliant
BK/S506-1-R	Eaton	1	250	5x20mm	Slow Blow	35	6.45	0.0757	Active	ROHS3 Compliant
BK/GDC-1A	Eaton	1	250	5x20mm	Slow Blow	35	6.45	0.0757	Active	ROHS3 Compliant
BK/GMD-1-R	Eaton	1	250	5x20mm	Slow Blow	35	12	0.3065	Active	ROHS3 Compliant
BK1/GMD-1-R	Eaton	1	250	5x20mm	Slow Blow	100	12	0.3065	Active	ROHS3 Compliant
BK1/S506-1-R-R	Eaton	1	250	5x20mm	Slow Blow	35	6.45	0.0757	Active	ROHS3 Compliant
GDC-1A	Eaton	1	250	5x20mm	Slow Blow	35	6.45	0.0757	Active	ROHS3 Compliant
GMD-1-R	Eaton	1	250	5x20mm	Slow Blow	35	12	0.3065	Active	ROHS3 Compliant
S506-1-R	Eaton	1	250	5x20mm	Slow Blow	35	6.45	0.0757	Active	ROHS3 Compliant
0034.3117	SCHURTER Inc.	1	250	5x20mm	Slow Blow	35	3.3	Not specified	Active	ROHS3 Compliant
0213001.MXP	Littelfuse Inc.	1	250	5x20mm	Slow Blow	35	19.2	0.1165	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Eaton - Electronics Division)

For applications requiring direct manufacturer continuity and maximum certification compatibility, select from the active Eaton product lines: BK/S506-1-R, S506-1-R, BK1/S506-1-R-R, BK/GDC-1A, or GDC-1A. These parts maintain the S506 or GDC series designation and carry active product status with ROHS3 compliance. All provide identical electrical and mechanical specifications to the obsolete BK/S506-1A.

Secondary Substitutes (Eaton GMD Series)

The BK/GMD-1-R, BK1/GMD-1-R, and GMD-1-R variants offer active product status and ROHS3 compliance. These parts differ in melting I²t (12 versus 6.45) and DC cold resistance (0.3065 Ohms versus 0.0757 Ohms), which may affect thermal response characteristics in specific circuit applications. The BK1/GMD-1-R variant features a higher breaking capacity of 100 A compared to the standard 35 A rating.

Cross-Manufacturer Alternatives

SCHURTER Inc. part 0034.3117 (FST 5x20 series) and Littelfuse Inc. part 0213001.MXP (213 series) provide functionally equivalent substitutes with identical current, voltage, and package specifications. These parts carry active product status and ROHS3 compliance. Melting I²t values differ (3.3 and 19.2 respectively), reflecting different thermal response profiles. SCHURTER part includes specified operating temperature range (-55°C to 125°C); Littelfuse part includes DC cold resistance specification (0.1165 Ohms).

Certification Considerations

The original BK/S506-1A carries approvals from BSI, CCC, CSA, cULus, IMQ, MITI, SEMKO, and VDE. Substitute selection should consider application-specific certification requirements. Eaton S506 and GDC series maintain broad certification coverage. GMD series carries CSA, PSE/JET, and UL approvals. SCHURTER 0034.3117 carries CCC, cURus, PSE/JET, and VDE approvals. Littelfuse 0213001.MXP carries BSI, CCC, CE, CSA, PSE, SEMKO, UR, and VDE approvals.

Frequently Asked Questions (FAQ)

Q: Can BK/S506-1A be directly replaced with any of the listed substitutes?

A: Yes. All listed substitute parts meet the critical electrical and mechanical parameters: 1 A current rating, 250 V AC voltage rating, 5mm x 20mm package, glass cartridge type, slow blow response, and holder-based mounting. Physical and electrical compatibility with existing fuse holders is maintained.

Q: What is the difference between Eaton S506 and GMD series substitutes?

A: Both series meet identical electrical and mechanical specifications for the BK/S506-1A. The primary differences are melting I²t values (S506 series: 6.45; GMD series: 12) and DC cold resistance (S506 series: 0.0757 Ohms; GMD series: 0.3065 Ohms). These differences affect thermal response characteristics. GMD series carries different certification approvals (CSA, PSE/JET, UL) compared to S506 series (BSI, CCC, CSA, CURUS, IMQ, PSE/JET, SEMKO, VDE).

Q: Why do melting I²t values vary among substitutes?

A: Melting I²t is a thermal characteristic that defines the energy required to melt the fuse element. Variations reflect different fuse element designs and materials used by manufacturers. All listed parts maintain the same current rating and response time classification (slow blow), ensuring functional compatibility in circuit protection applications.

Q: Are cross-manufacturer substitutes (SCHURTER, Littelfuse) fully compatible?

A: Yes. SCHURTER 0034.3117 and Littelfuse 0213001.MXP meet all critical electrical and mechanical specifications identical to BK/S506-1A. Both are active products with ROHS3 compliance. Physical dimensions (5mm x 20mm) ensure compatibility with standard fuse holders. Certification approvals differ by manufacturer; verify application-specific requirements.

Q: What is the significance of RoHS compliance status?

A: The original BK/S506-1A is RoHS non-compliant. All active substitute parts listed are ROHS3 compliant, meeting current environmental and regulatory requirements for electronic component manufacturing and use in regulated markets.

Q: Can BK1/GMD-1-R be used as a substitute despite its 100 A breaking capacity?

A: BK1/GMD-1-R meets all electrical and mechanical specifications of BK/S506-1A (1 A current rating, 250 V voltage, 5x20mm package, slow blow response). The higher breaking capacity (100 A versus 35 A) indicates enhanced fault current handling capability and does not prevent substitution. Application-specific circuit requirements should be evaluated.

Q: Which substitute offers the broadest certification coverage?

A: Littelfuse 0213001.MXP carries the most comprehensive certification approvals: BSI, CCC, CE, CSA, PSE, SEMKO, UR, and VDE. This broad certification profile supports use in diverse regulatory environments and international applications.

Q: Is inventory availability a factor in substitute selection?

A: Inventory levels are provided for reference. SCHURTER 0034.3117 shows the highest inventory (7410 Pcs), followed by Littelfuse 0213001.MXP (10400 Pcs). Eaton substitutes range from 722 to 1618 Pcs. Availability should be confirmed with suppliers for specific procurement timelines.

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