BK/S500-200-R Equivalent & Substitute Parts

Part Overview

The BK/S500-200-R is a 200 mA fast-blow glass fuse cartridge rated for 250 V AC/DC operation in a 5mm x 20mm form factor. This Eaton Electronics Division component requires a fuse holder for installation and is classified as active product status. Substitute parts are identified to provide alternative sourcing options when the primary part is unavailable or when design requirements necessitate different electrical characteristics within the same functional category.

Key Parameters

Parameter	Value
Current Rating	200 mA
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Fast Blow
Package / Case	5mm x 20mm
Breaking Capacity @ Rated Voltage	35A
Mounting Type	Requires Holder
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the BK/S500-200-R is determined by strict equivalence across the following parameters: current rating (200 mA), voltage rating (250 V AC), fuse type (cartridge glass), response time (fast blow), and physical package dimensions (5mm x 20mm). All substitute parts listed maintain these core electrical and mechanical specifications, ensuring direct functional interchangeability within applications designed for this fuse category.

Substitute parts are grouped into three categories based on manufacturer and series designation:

Eaton Electronics Division (Same Manufacturer): Parts BK1/S500-200-R and S500-200-R maintain identical electrical parameters and approval certifications as the primary part, with variations in packaging designation only.

Eaton Electronics Division (GMA Series): Parts BK/GMA-200-R and GMA-200-R provide equivalent electrical performance with different approval agency certifications (CSA, PSE, UL versus BSI, CCC, CSA, cULus, IMQ, SEMKO, VDE).

Third-Party Manufacturers: Parts from Littelfuse Inc. (0217.200MXP, 0217.200HXP, 0217.200TXP, 0235.200HXP), SCHURTER Inc. (0034.1509), and OptiFuse (FSC-200MA) meet the core electrical specifications and physical dimensions while offering alternative approval certifications and operational temperature ranges.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Series	Current Rating (mA)	Voltage Rating (V AC)	Response Time	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ohms)	Operating Temperature	Approval Agencies
BK/S500-200-R	Eaton - Electronics Division	S500	200	250	Fast Blow	35	0.016	6.8	Not Specified	BSI, CCC, CSA, cULus, IMQ, SEMKO, VDE
BK/GMA-200-R	Eaton - Electronics Division	GMA	200	250	Fast Blow	35	0.001	2.5	Not Specified	CSA, PSE, UL
BK1/S500-200-R	Eaton - Electronics Division	S500	200	250	Fast Blow	35	0.016	6.8	Not Specified	BSI, CCC, CSA, cULus, IMQ, SEMKO, VDE
GMA-200-R	Eaton - Electronics Division	GMA	200	250	Fast Blow	35	0.001	2.5	Not Specified	CSA, PSE, UL
S500-200-R	Eaton - Electronics Division	S500	200	250	Fast Blow	35	0.016	6.8	Not Specified	BSI, CCC, CSA, cULus, IMQ, SEMKO, VDE
0034.1509	SCHURTER Inc.	FSF 5x20	200	250	Fast Blow	35	0.0252	Not Specified	-55°C ~ 125°C	CCC, cURus, VDE
0217.200MXP	Littelfuse Inc.	217	200	250	Fast Blow	35	0.02	1.7	-55°C ~ 125°C	CCC, CE, CSA, K-MARK, SEMKO, UL, VDE
0235.200HXP	Littelfuse Inc.	235	200	250	Fast Blow	35	0.00867	3.15	-55°C ~ 125°C	CE, CSA, KC, UL
0217.200HXP	Littelfuse Inc.	217	200	250	Fast Blow	35	0.02	1.7	-55°C ~ 125°C	CCC, CE, CSA, K-MARK, SEMKO, UL, VDE
0217.200TXP	Littelfuse Inc.	217	200	250	Fast Blow	35	0.02	1.7	-55°C ~ 125°C	CCC, CE, CSA, KC, SEMKO, UR, VDE
FSC-200MA	OptiFuse	FSC	200	250	Fast Blow	100	Not Specified	0.02697	-55°C ~ 90°C	cULus, UL 248

Engineering Selection Recommendations

Primary Substitutes (Eaton S500 Series): Parts BK1/S500-200-R and S500-200-R are direct equivalents to BK/S500-200-R with identical electrical characteristics, melting I²t values, and approval certifications. These parts are suitable for applications requiring the full certification scope (BSI, CCC, CSA, cULus, IMQ, SEMKO, VDE).

Alternative Eaton GMA Series: Parts BK/GMA-200-R and GMA-200-R maintain equivalent current, voltage, and breaking capacity ratings but feature reduced melting I²t (0.001 versus 0.016) and lower DC cold resistance (2.5 versus 6.8 Ohms). These parts carry CSA, PSE, and UL certifications. Selection of GMA series requires confirmation that the reduced thermal characteristics align with circuit protection requirements.

Littelfuse 217 Series: Parts 0217.200MXP, 0217.200HXP, and 0217.200TXP provide equivalent electrical performance with melting I²t of 0.02 and DC cold resistance of 1.7 Ohms. These parts include extended operating temperature range (-55°C to 125°C) and comprehensive approval certifications (CCC, CE, CSA, K-MARK, SEMKO, UL, VDE). The 0217.200TXP variant includes UR certification in place of K-MARK.

Littelfuse 235 Series: Part 0235.200HXP maintains equivalent current and voltage ratings with melting I²t of 0.00867 and DC cold resistance of 3.15 Ohms. Certifications include CE, CSA, KC, and UL. Operating temperature range extends to -55°C to 125°C.

SCHURTER FSF 5x20 Series: Part 0034.1509 meets core electrical specifications with melting I²t of 0.0252 and operating temperature range of -55°C to 125°C. Certifications include CCC, cURus, and VDE.

OptiFuse FSC Series: Part FSC-200MA provides equivalent current and voltage ratings with higher breaking capacity (100A versus 35A) and extended DC cold resistance specification (0.02697 Ohms). Operating temperature range is -55°C to 90°C with cULus and UL 248 certifications.

Frequently Asked Questions (FAQ)

Q: Can BK/S500-200-R be directly replaced with BK/GMA-200-R?

A: Both parts share identical current rating (200 mA), voltage rating (250 V AC), fuse type (cartridge glass), response time (fast blow), and physical dimensions (5mm x 20mm). However, BK/GMA-200-R exhibits different melting I²t (0.001 versus 0.016) and DC cold resistance (2.5 versus 6.8 Ohms). Substitution is permissible only when circuit protection requirements accommodate these thermal characteristics and when CSA, PSE, and UL certifications satisfy application compliance needs.

Q: What is the significance of melting I²t variation among substitute parts?

A: Melting I²t represents the thermal energy required to melt the fuse element. Variations in this parameter affect the fuse's response to transient overcurrent conditions. Parts with lower melting I²t (such as BK/GMA-200-R at 0.001) respond more quickly to thermal stress, while parts with higher melting I²t (such as BK/S500-200-R at 0.016) tolerate longer duration overcurrent events. Selection must align with circuit protection strategy and equipment tolerance specifications.

Q: Are Littelfuse 217 series parts suitable replacements for Eaton S500 series?

A: Littelfuse 0217.200MXP, 0217.200HXP, and 0217.200TXP maintain equivalent current, voltage, breaking capacity, and physical dimensions. These parts feature melting I²t of 0.02 and DC cold resistance of 1.7 Ohms, differing from the Eaton S500 specification of 0.016 and 6.8 Ohms respectively. Substitution is valid when application requirements accommodate these electrical differences and when the extended operating temperature range (-55°C to 125°C) and alternative certification set (CCC, CE, CSA, K-MARK, SEMKO, UL, VDE) satisfy compliance obligations.

Q: How does the OptiFuse FSC-200MA differ from other substitutes?

A: The FSC-200MA maintains equivalent current and voltage ratings with a significantly higher breaking capacity (100A versus 35A). This enhanced breaking capacity provides greater protection margin in high-fault-current applications. Operating temperature range is -55°C to 90°C, which is narrower than some alternatives. Certifications are limited to cULus and UL 248. Selection requires confirmation that the higher breaking capacity and restricted temperature range align with application requirements.

Q: What approval certifications are critical for my application?

A: Approval agency selection depends on geographic market and equipment standards compliance. The BK/S500-200-R carries BSI, CCC, CSA, cULus, IMQ, SEMKO, and VDE certifications. Substitute parts carry varying certification subsets. For North American applications, CSA and cULus certifications are typically required. For European markets, CE and VDE certifications are standard. For Asian markets, CCC and K-MARK certifications may be mandatory. Verify application-specific compliance requirements before selecting a substitute part.

Q: Can I use a substitute part with a different DC cold resistance value?

A: DC cold resistance affects circuit behavior during normal operation and influences voltage drop across the fuse element. The BK/S500-200-R specifies 6.8 Ohms, while substitutes range from 0.02697 Ohms (FSC-200MA) to 6.8 Ohms (BK1/S500-200-R, S500-200-R). Substitution with significantly different resistance values (such as FSC-200MA at 0.02697 Ohms) requires circuit analysis to confirm that altered voltage drop characteristics do not compromise system performance or introduce unintended protection behavior.

Q: Are all substitute parts available in the same packaging format?

A: All substitute parts maintain the 5mm x 20mm physical form factor and require a fuse holder for installation, matching the BK/S500-200-R mounting requirement. Packaging designation (Bulk versus unspecified) does not affect electrical or mechanical compatibility. Verify fuse holder compatibility with the specific substitute part selected, as holder design may incorporate minor dimensional tolerances.

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