5ST 63 Glass Cartridge Fuse - Equivalent & Substitute Parts

Part Overview

The 5ST 63 is a 63 mA, 250 V AC/DC glass cartridge fuse manufactured by Bel Fuse Inc. in a 5mm x 20mm form factor with slow-blow response characteristics. This part is classified as obsolete, making equivalent substitutes necessary for ongoing circuit protection applications. Substitute parts maintain identical electrical ratings and mechanical dimensions while offering active product status and improved compliance certifications.

Key Parameters

Parameter	Value
Current Rating	63 mA
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Package / Case	5mm x 20mm
Response Time	Slow Blow
Breaking Capacity @ Rated Voltage	35A
Mounting Type	Requires Holder
Operating Temperature Range	-55°C ~ 125°C

Substitute Part Grouping Explanation

Substitution eligibility for the 5ST 63 is determined by strict equivalence across the following parameters:

Current Rating: 63 mA (exact match required)
Voltage Rating: 250 V AC (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)
Breaking Capacity: 35A (exact match required)

All substitute parts listed below meet these criteria. Variations in secondary parameters such as melting I²t, DC cold resistance, and approval agencies do not affect substitution eligibility when primary electrical and mechanical specifications are identical.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Current Rating (mA)	Voltage (V AC)	Package	Response Time	Breaking Capacity (A)	Product Status	RoHS Status
5ST 63	Bel Fuse Inc.	63	250	5mm x 20mm	Slow Blow	35	Obsolete	Non-compliant
5ST 63-R	Bel Fuse Inc.	63	250	5mm x 20mm	Slow Blow	35	Active	ROHS3 Compliant
0034.3105	SCHURTER Inc.	63	250	5mm x 20mm	Slow Blow	35	Active	ROHS3 Compliant
0218.063HXP	Littelfuse Inc.	63	250	5mm x 20mm	Slow Blow	35	Active	ROHS3 Compliant
0218.063MXGP	Littelfuse Inc.	63	250	5mm x 20mm	Slow Blow	35	Active	ROHS3 Compliant
0218.063MXP	Littelfuse Inc.	63	250	5mm x 20mm	Slow Blow	35	Active	ROHS3 Compliant
0218.063TXP	Littelfuse Inc.	63	250	5mm x 20mm	Slow Blow	35	Active	ROHS3 Compliant
0218.063VXP	Littelfuse Inc.	63	250	5mm x 20mm	Slow Blow	35	Active	ROHS3 Compliant
GDC-63MA	Eaton - Electronics Division	63	250	5mm x 20mm	Slow Blow	35	Active	Not specified

Engineering Selection Recommendations

All listed substitute parts are electrically and mechanically equivalent to the 5ST 63. Selection should prioritize active product status and compliance certifications:

5ST 63-R (Bel Fuse Inc.) provides direct manufacturer continuity with ROHS3 compliance and active product status, making it the primary substitute when supply from the original manufacturer is preferred.

Littelfuse 218 series parts (0218.063HXP, 0218.063MXGP, 0218.063MXP, 0218.063TXP, 0218.063VXP) offer ROHS3 compliance and comprehensive approval certifications including CCC, CE, CSA, UL, and VDE. These parts are widely available with active product status.

SCHURTER 0034.3105 (FST 5x20 series) provides ROHS3 compliance with CCC, cURus, and VDE certifications and active product status.

Eaton GDC-63MA offers active product status with cURus and IMQ certifications, though RoHS compliance status is not specified in available documentation.

Frequently Asked Questions (FAQ)

Q: Can I substitute the 5ST 63 with any of the listed parts?

A: Yes. All listed parts meet the required electrical specifications (63 mA, 250 V AC, 35A breaking capacity) and mechanical dimensions (5mm x 20mm). They are direct functional equivalents for circuit protection applications.

Q: What is the difference between the Littelfuse 218 series variants (HXP, MXGP, MXP, TXP, VXP)?

A: All variants maintain identical current rating, voltage, and package specifications. Differences exist in melting I²t values and DC cold resistance, which reflect internal construction variations. Selection among variants depends on specific circuit time-delay requirements and thermal characteristics needed for your application.

Q: Does the 5ST 63-R offer any advantage over other substitutes?

A: The 5ST 63-R maintains manufacturer continuity with Bel Fuse Inc. and provides ROHS3 compliance with active product status. It is functionally identical to other substitutes and selection should be based on supply availability and cost considerations.

Q: Are there any compatibility concerns when switching from 5ST 63 to a substitute part?

A: No. All substitute parts use the same 5mm x 20mm cartridge form factor and require the same holder type. They are direct drop-in replacements with no modifications to circuit design or fuse holder equipment required.

Q: Which substitute offers the broadest approval certifications?

A: Littelfuse 218 series parts (0218.063HXP, 0218.063MXGP, 0218.063MXP, 0218.063TXP, 0218.063VXP) carry the most comprehensive certification coverage including CCC, CE, CSA, K-MARK, SEMKO, UL, and VDE, making them suitable for applications requiring multiple regional compliance standards.

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