5ST 500 Glass Cartridge Fuse - Equivalent & Substitute Parts

Part Overview

The 5ST 500 is a 500 mA, 250 V AC/DC slow-blow glass cartridge fuse in 5mm x 20mm form factor manufactured by Bel Fuse Inc. This part is classified as obsolete. Identification of equivalent and substitute parts is necessary to maintain circuit protection functionality in applications where the original 5ST 500 is no longer available or where design requirements necessitate alternative sourcing options.

Key Parameters

Parameter	Value
Current Rating	500 mA
Voltage Rating (AC)	250 V
Voltage Rating (DC)	Not specified
Response Time	Slow Blow
Package / Case	5mm x 20mm
Fuse Type	Cartridge, Glass
Mounting Type	Requires Holder
Breaking Capacity @ Rated Voltage	35 A
Melting I²t	1.4
Operating Temperature Range	-55°C to 125°C
DC Cold Resistance	0.54 Ohms
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitute parts for the 5ST 500 are classified into two categories based on electrical and mechanical compatibility:

Direct Manufacturer Substitutes maintain all critical electrical parameters: 500 mA current rating, 250 V AC voltage rating, slow-blow response time, 5mm x 20mm package dimensions, and 35 A breaking capacity. These parts are functionally interchangeable within the same circuit protection application.

Parametric Equivalents share the same current rating, voltage rating, response time, and package dimensions but differ in breaking capacity or melting I²t characteristics. These parts provide equivalent circuit protection but may exhibit different thermal response profiles.

Similar Parts share the same package form factor and current rating but differ in voltage rating, response time classification, or temperature range. These parts are suitable only for applications where the differing parameters align with circuit requirements.

The following parameters determine substitution eligibility:

Current Rating (Amps): 500 mA
Voltage Rating (AC): 250 V
Response Time: Slow Blow
Package / Case: 5mm x 20mm
Mounting Type: Requires Holder

Parameter Comparison

Part Number	Manufacturer	Current Rating	Voltage (AC)	Response Time	Package	Breaking Capacity	Melting I²t	DC Resistance	RoHS Status	Product Status
5ST 500	Bel Fuse Inc.	500 mA	250 V	Slow Blow	5x20mm	35 A	1.4	0.54 Ω	Non-compliant	Obsolete
5ST 500-R	Bel Fuse Inc.	500 mA	250 V	Slow Blow	5x20mm	35 A	1.4	0.54 Ω	ROHS3 Compliant	Active
5TT 500-R	Bel Fuse Inc.	500 mA	250 V	Slow Blow	5x20mm	100 A	2.5	0.865 Ω	ROHS3 Compliant	Active
0034.3114	SCHURTER Inc.	500 mA	250 V	Slow Blow	5x20mm	35 A	3	Not specified	ROHS3 Compliant	Active
0218.500MXBP	Littelfuse Inc.	500 mA	250 V	Slow Blow	5x20mm	35 A	2.825	0.37 Ω	ROHS3 Compliant	Active
0218.500MXP	Littelfuse Inc.	500 mA	250 V	Slow Blow	5x20mm	35 A	2.825	0.37 Ω	ROHS3 Compliant	Active
0218.500TXP	Littelfuse Inc.	500 mA	250 V	Slow Blow	5x20mm	35 A	2.825	0.37 Ω	ROHS3 Compliant	Active
0218.500VXP	Littelfuse Inc.	500 mA	250 V	Slow Blow	5x20mm	35 A	2.825	0.37 Ω	ROHS3 Compliant	Active
0034.2513	SCHURTER Inc.	500 mA	250 V	Medium Blow	5x20mm	80 A	0.675	Not specified	ROHS3 Compliant	Active
0034.3771	SCHURTER Inc.	500 mA	250 V	Slow Blow	5x20mm	35 A	0.73	Not specified	ROHS3 Compliant	Active

Engineering Selection Recommendations

Primary Direct Substitute: 5ST 500-R (Bel Fuse Inc.) is the recommended replacement for the obsolete 5ST 500. This part maintains identical electrical specifications and mechanical form factor while offering ROHS3 compliance and active product status. Both parts share the same 35 A breaking capacity, 1.4 melting I²t, and 0.54 Ohm DC cold resistance.

Alternative Direct Substitutes: The Littelfuse 0218 series (0218.500MXBP, 0218.500MXP, 0218.500TXP, 0218.500VXP) and SCHURTER 0034.3114 provide direct electrical equivalence with identical current rating, voltage rating, response time, and breaking capacity. These parts differ in melting I²t and DC cold resistance but remain functionally compatible for 500 mA, 250 V AC slow-blow applications. All are ROHS3 compliant and carry active product status.

Parametric Equivalent: 5TT 500-R (Bel Fuse Inc.) offers higher breaking capacity (100 A) and increased melting I²t (2.5) compared to the original 5ST 500. This part is suitable for applications requiring enhanced fault current handling while maintaining the same current and voltage ratings.

Similar Parts with Restrictions: 0034.2513 (SCHURTER Inc.) differs in response time classification (Medium Blow vs. Slow Blow) and is suitable only for applications where medium-blow response is acceptable. 0034.3771 (SCHURTER Inc.) maintains slow-blow response but exhibits lower melting I²t (0.73) and is suitable only where faster thermal response is required.

Parts selected should match the circuit protection requirements of the original application. Compliance certifications (CE, CSA, UL, VDE) are available across all recommended direct substitutes.

Frequently Asked Questions (FAQ)

Q: Can 5ST 500-R be used as a direct replacement for the obsolete 5ST 500?

A: Yes. The 5ST 500-R maintains identical electrical parameters (500 mA, 250 V AC, slow-blow response, 35 A breaking capacity) and mechanical form factor (5mm x 20mm). The primary difference is RoHS3 compliance and active product status. Both parts require the same holder and are mechanically and electrically interchangeable.

Q: What is the difference between the Littelfuse 0218 series parts (0218.500MXBP, 0218.500MXP, 0218.500TXP, 0218.500VXP)?

A: All four Littelfuse 0218 series parts share identical electrical specifications for this application (500 mA, 250 V AC, slow-blow, 35 A breaking capacity, 2.825 melting I²t). The part number suffixes indicate packaging or certification variations. All are ROHS3 compliant and active products suitable for direct substitution.

Q: When should 5TT 500-R be selected instead of 5ST 500-R?

A: The 5TT 500-R offers higher breaking capacity (100 A vs. 35 A) and increased melting I²t (2.5 vs. 1.4). Select 5TT 500-R when the circuit requires enhanced fault current handling capability while maintaining 500 mA current protection and 250 V AC voltage rating.

Q: Are all substitute parts compatible with the same fuse holder as the original 5ST 500?

A: Yes. All substitute parts listed maintain the 5mm x 20mm package dimension and cartridge glass form factor, requiring the same holder type. Physical installation is identical across all direct substitutes and parametric equivalents.

Q: What certifications are available for substitute parts?

A: Direct substitutes carry multiple international certifications including CE, CSA, UL, and VDE. The 5ST 500-R adds CCC and cURus certifications. Littelfuse 0218 series parts include K-MARK and SEMKO certifications. Verify specific certification requirements for your application before selection.

Q: Why does the original 5ST 500 show RoHS non-compliance?

A: The 5ST 500 is classified as obsolete and predates current RoHS3 requirements. All active substitute parts listed are ROHS3 compliant, meeting current environmental and material restriction standards.

Q: Can 0034.2513 (Medium Blow) be used in place of 5ST 500 (Slow Blow)?

A: No, unless the application specifically requires medium-blow response. The 0034.2513 differs in response time classification and melting I²t (0.675 vs. 1.4), resulting in faster thermal response. Use only if circuit design permits this change.

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