Equivalent & Substitute Parts for 5ST 200 Glass Cartridge Fuse

Part Overview

The Bel Fuse Inc. 5ST 200 is a 200 mA, 250 V AC/DC slow-blow glass cartridge fuse in 5mm x 20mm form factor, designed for circuit protection in industrial and commercial applications. This part is classified as obsolete, making equivalent substitutes necessary for ongoing system maintenance and new designs. Direct replacements and parametric equivalents are available from multiple manufacturers including Littelfuse Inc., SCHURTER Inc., and Eaton Electronics Division, all meeting the same electrical and mechanical specifications required for this application.

Key Parameters

Parameter	Value
Current Rating	200 mA
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Package / Case	5mm x 20mm
Response Time	Slow Blow
Mounting Type	Requires Holder
Operating Temperature Range	-55°C to 125°C
Breaking Capacity @ Rated Voltage	35 A (standard); 100 A (5TT series)

Substitute Part Grouping Explanation

Substitution for the 5ST 200 is determined by strict equivalence in the following parameters: current rating (200 mA), voltage rating (250 V AC), fuse type (cartridge glass), physical dimensions (5mm x 20mm), response time (slow blow), and mounting requirement (holder-based). Parts are grouped into three categories:

Direct Manufacturer Equivalents maintain identical electrical and mechanical specifications with active product status and improved RoHS compliance. These include 5ST 200-R (Bel Fuse Inc.), 0218.200MXP, 0218.200HXP, 0218.200MXBP, 0218.200TXP, and 0218.200VXP (all Littelfuse Inc. Series 218), and 0034.3110 (SCHURTER Inc. FST 5x20 series).

Parametric Equivalents meet all core electrical and mechanical requirements but may differ in secondary characteristics such as breaking capacity or melting I²t values. The 5TT 200-R (Bel Fuse Inc.) features a higher breaking capacity of 100 A versus the standard 35 A.

Similar Alternatives maintain core specifications but exhibit variations in response time classification or other secondary parameters. The BK1/GMC-200-R (Eaton Electronics Division) is classified as medium blow rather than slow blow, and the 0239.200HXP (Littelfuse Inc. Series 239) exhibits different thermal characteristics.

Parameter Comparison

Part Number	Manufacturer	Current Rating	Voltage (AC)	Response Time	Package	Breaking Capacity	Melting I²t	RoHS Status	Product Status
5ST 200	Bel Fuse Inc.	200 mA	250 V	Slow Blow	5mm x 20mm	35 A	0.15	Non-compliant	Obsolete
5ST 200-R	Bel Fuse Inc.	200 mA	250 V	Slow Blow	5mm x 20mm	35 A	0.15	ROHS3 Compliant	Active
5TT 200-R	Bel Fuse Inc.	200 mA	250 V	Slow Blow	5mm x 20mm	100 A	0.476	ROHS3 Compliant	Active
0034.3110	SCHURTER Inc.	200 mA	250 V	Slow Blow	5mm x 20mm	35 A	0.256	ROHS3 Compliant	Active
0218.200HXP	Littelfuse Inc.	200 mA	250 V	Slow Blow	5mm x 20mm	35 A	0.341	ROHS3 Compliant	Active
0218.200MXBP	Littelfuse Inc.	200 mA	250 V	Slow Blow	5mm x 20mm	35 A	0.341	ROHS3 Compliant	Active
0218.200MXP	Littelfuse Inc.	200 mA	250 V	Slow Blow	5mm x 20mm	35 A	0.341	ROHS3 Compliant	Active
0218.200TXP	Littelfuse Inc.	200 mA	250 V	Slow Blow	5mm x 20mm	35 A	0.341	ROHS3 Compliant	Active
0218.200VXP	Littelfuse Inc.	200 mA	250 V	Slow Blow	5mm x 20mm	35 A	0.341	ROHS3 Compliant	Active
0239.200HXP	Littelfuse Inc.	200 mA	250 V	Slow Blow	5mm x 20mm	35 A	0.165	ROHS3 Compliant	Active
BK1/GMC-200-R	Eaton Electronics Division	200 mA	250 V	Medium Blow	5mm x 20mm	35 A	0.032	ROHS3 Compliant	Active

Engineering Selection Recommendations

For direct replacement of the obsolete 5ST 200, the 5ST 200-R from Bel Fuse Inc. is the primary choice, offering identical electrical and mechanical specifications with active product status and ROHS3 compliance. This part maintains the same 35 A breaking capacity and 0.15 melting I²t value as the original.

Littelfuse Inc. Series 218 parts (0218.200MXP, 0218.200HXP, 0218.200MXBP, 0218.200TXP, 0218.200VXP) provide functionally equivalent alternatives with broader international certification coverage including CCC, CE, CSA, K-MARK, SEMKO, UL, and VDE approvals. These parts are actively manufactured and ROHS3 compliant.

The SCHURTER Inc. 0034.3110 (FST 5x20 series) offers equivalent performance with CCC, cURus, and VDE certifications and is suitable for applications requiring SCHURTER component standardization.

The 5TT 200-R from Bel Fuse Inc. serves as a parametric equivalent for applications requiring higher breaking capacity (100 A) while maintaining the same current and voltage ratings. This part is appropriate only when the increased breaking capacity does not conflict with circuit design requirements.

The BK1/GMC-200-R from Eaton Electronics Division differs in response time classification (medium blow versus slow blow) and melting I²t value (0.032 versus 0.15). This part is suitable only for applications where medium-blow response characteristics are acceptable.

The 0239.200HXP from Littelfuse Inc. exhibits a lower melting I²t value (0.165 versus 0.15 for the original) and should be evaluated for thermal compatibility in the specific application circuit.

Frequently Asked Questions (FAQ)

Q: Can I use 5ST 200-R as a direct replacement for the obsolete 5ST 200?

A: Yes. The 5ST 200-R maintains identical electrical specifications (200 mA, 250 V AC), response time (slow blow), physical dimensions (5mm x 20mm), and breaking capacity (35 A). The primary difference is improved RoHS compliance and active product status.

Q: What is the difference between slow-blow and medium-blow fuses, and does it matter for substitution?

A: Response time classification determines how quickly the fuse element melts under overcurrent conditions. Slow-blow fuses tolerate temporary inrush currents before opening, while medium-blow fuses respond faster. Substitution between these types requires circuit validation, as the protection characteristics differ. The BK1/GMC-200-R is medium-blow and should not be used as a direct substitute without circuit analysis.

Q: Are all Littelfuse Series 218 parts (0218.200MXP, 0218.200HXP, 0218.200MXBP, 0218.200TXP, 0218.200VXP) interchangeable?

A: These parts share identical electrical and mechanical specifications and are mechanically interchangeable. Differences in part number suffixes reflect packaging variants and regional certification differences. Selection should be based on required certifications for the target market and application.

Q: What does breaking capacity mean, and why does the 5TT 200-R have 100 A instead of 35 A?

A: Breaking capacity is the maximum fault current the fuse can safely interrupt without rupturing or creating a hazard. The 5TT 200-R has a higher breaking capacity due to internal design differences in the fuse element and construction. Use the 5TT 200-R only if the application circuit requires this higher rating; otherwise, the standard 35 A breaking capacity is sufficient.

Q: Do all substitute parts require the same holder as the original 5ST 200?

A: Yes. All listed substitutes maintain the 5mm x 20mm cartridge form factor and require a standard 5x20mm fuse holder. Physical compatibility is guaranteed across all listed parts.

Q: Which substitute offers the broadest international certification coverage?

A: Littelfuse Series 218 parts (0218.200MXP, 0218.200HXP, 0218.200MXBP, 0218.200TXP, 0218.200VXP) provide the most comprehensive certification portfolio, including CCC, CE, CSA, K-MARK, SEMKO, UL, and VDE approvals, making them suitable for global applications.

Q: Is the 0239.200HXP a suitable substitute despite its lower melting I²t value?

A: The 0239.200HXP has a melting I²t of 0.165 compared to the original 0.15, representing a 10% increase. This part is mechanically and electrically compatible but exhibits slightly different thermal response. Application-specific circuit analysis is required to confirm suitability.

Q: What is the significance of RoHS compliance for fuse selection?

A: RoHS3 compliance indicates the part meets current environmental and hazardous substance restrictions. The original 5ST 200 is RoHS non-compliant, while all active substitutes are ROHS3 compliant, making them suitable for modern equipment designs subject to environmental regulations.

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