Equivalent & Substitute Parts for 5ST 1 Glass Cartridge Fuse

Part Overview

The Bel Fuse Inc. 5ST 1 is a 1 A, 250 V AC/DC glass cartridge fuse with slow-blow response characteristics, designed for 5mm x 20mm holder-based applications. This part is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain circuit protection functionality in legacy systems and to access active inventory from current product lines.

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
Operating Temperature Range	-55°C to 125°C
Breaking Capacity @ Rated Voltage	35 A

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence in the following parameters: current rating (1 A), voltage rating (250 V AC), fuse type (cartridge glass), package dimensions (5mm x 20mm), response time (slow blow), and mounting type (requires holder). Parts are grouped into three categories:

Direct Substitutes (Same Series, Active Status): Parts 5ST 1-R, 0218001.HXP, 0218001.MXBP, 0218001.MXP, and 0218001.VXP meet all core electrical and mechanical parameters. These parts are from active product lines with current inventory availability.

Parametric Equivalents (Different Series, Enhanced Specifications): Parts 5ET 1-R and 5TT 1-R share identical electrical ratings and package dimensions but feature higher breaking capacities (150 A and 100 A respectively) and different melting I²t values. These represent upgraded alternatives within the Bel Fuse product family.

Cross-Manufacturer Equivalents: Parts 0034.3117.TR (SCHURTER), 0034.3117 (SCHURTER), 0213001.MXP (Littelfuse), and 0034.3117 (SCHURTER) provide functional equivalence across manufacturers while maintaining the specified electrical and mechanical parameters.

Parameter Comparison

Part Number	Manufacturer	Current (A)	Voltage (V AC)	Package	Response	Breaking Capacity (A)	Melting I²t	Product Status	RoHS Status
5ST 1	Bel Fuse Inc.	1	250	5mm x 20mm	Slow Blow	35	2.4	Obsolete	Non-compliant
5ST 1-R	Bel Fuse Inc.	1	250	5mm x 20mm	Slow Blow	35	2.4	Active	ROHS3 Compliant
5ET 1-R	Bel Fuse Inc.	1	250	5mm x 20mm	Slow Blow	150	28	Active	ROHS3 Compliant
5TT 1-R	Bel Fuse Inc.	1	250	5mm x 20mm	Slow Blow	100	8.63	Active	ROHS3 Compliant
0034.3117.TR	SCHURTER Inc.	1	250	5mm x 20mm (Axial)	Slow Blow	35	3.3	Active	ROHS3 Compliant
0034.3117	SCHURTER Inc.	1	250	5mm x 20mm	Slow Blow	35	3.3	Active	ROHS3 Compliant
0218001.HXP	Littelfuse Inc.	1	250	5mm x 20mm	Slow Blow	35	6.73	Active	ROHS3 Compliant
0218001.MXBP	Littelfuse Inc.	1	250	5mm x 20mm	Slow Blow	35	6.73	Active	ROHS3 Compliant
0218001.MXP	Littelfuse Inc.	1	250	5mm x 20mm	Slow Blow	35	6.73	Active	ROHS3 Compliant
0218001.VXP	Littelfuse Inc.	1	250	5mm x 20mm	Slow Blow	35	6.73	Active	ROHS3 Compliant
0213001.MXP	Littelfuse Inc.	1	250	5mm x 20mm	Slow Blow	35	19.2	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitute: 5ST 1-R (Bel Fuse Inc.) is the direct replacement from the same manufacturer. It maintains identical electrical and mechanical specifications while offering active product status and ROHS3 compliance. This part is recommended for applications requiring exact parameter matching with current inventory support.

Alternative from Bel Fuse Portfolio: 5ET 1-R and 5TT 1-R provide enhanced breaking capacity ratings (150 A and 100 A respectively) while maintaining the core 1 A, 250 V specification. These parts are suitable for applications where higher fault current withstand capability is beneficial.

Cross-Manufacturer Options: Littelfuse 0218001 series (HXP, MXBP, MXP, VXP) and SCHURTER 0034.3117 series provide functional equivalence with active status and ROHS3 compliance. Selection among these options depends on supply chain preference and certification requirements specific to the application.

Compliance Consideration: All recommended substitutes carry ROHS3 compliance, addressing regulatory requirements absent in the obsolete 5ST 1 part. Littelfuse parts include expanded certification coverage (CCC, CE, CSA, K-MARK, PSE, SEMKO, UL, VDE), while SCHURTER parts provide cURus certification.

Frequently Asked Questions (FAQ)

Q: Can 5ST 1-R directly replace 5ST 1 in existing designs? A: Yes. The 5ST 1-R maintains identical electrical ratings (1 A, 250 V AC/DC), fuse type (cartridge glass), package dimensions (5mm x 20mm), response time (slow blow), and mounting requirements (requires holder). The primary difference is product status (active vs. obsolete) and RoHS compliance.

Q: What is the difference between 5ST 1-R, 5ET 1-R, and 5TT 1-R? A: All three parts share the same current rating (1 A), voltage rating (250 V), package (5mm x 20mm), and response time (slow blow). They differ in breaking capacity and melting I²t: 5ST 1-R has 35 A breaking capacity with 2.4 I²t; 5ET 1-R has 150 A breaking capacity with 28 I²t; 5TT 1-R has 100 A breaking capacity with 8.63 I²t. Selection depends on the maximum fault current expected in the circuit.

Q: Are Littelfuse 0218001 series parts interchangeable with Bel Fuse 5ST 1? A: Littelfuse 0218001.HXP, 0218001.MXBP, 0218001.MXP, and 0218001.VXP are electrically and mechanically equivalent to 5ST 1. All share the 1 A, 250 V rating, 5mm x 20mm package, slow-blow response, and holder-based mounting. Differences exist in melting I²t (6.73 for Littelfuse vs. 2.4 for 5ST 1) and certification coverage.

Q: What is the difference between 0034.3117.TR and 0034.3117? A: Both SCHURTER parts are electrically equivalent (1 A, 250 V, 5mm x 20mm, slow blow). The primary difference is mounting type: 0034.3117.TR is through-hole (axial) with 5.40mm diameter and 22.50mm length, while 0034.3117 is holder-based with 5.20mm diameter and 20.00mm length. Selection depends on the circuit board layout and holder availability.

Q: Why do substitute parts have different melting I²t values? A: Melting I²t represents the thermal energy required to melt the fuse element and is determined by the internal construction and material composition. Different manufacturers and series use different designs, resulting in varying I²t values. All listed parts maintain the same current rating and response time classification (slow blow), ensuring functional compatibility in the specified application.

Q: Are all substitute parts RoHS compliant? A: All recommended substitute parts carry ROHS3 compliance. The original 5ST 1 is RoHS non-compliant. This compliance status is relevant for applications subject to RoHS regulations in the EU and other jurisdictions.

Q: Which substitute offers the broadest certification coverage? A: Littelfuse 0218001 series parts (HXP, MXBP, MXP, VXP) provide the most extensive certification coverage, including CCC, CE, CSA, K-MARK, PSE, SEMKO, UL, and VDE. This makes them suitable for applications requiring multi-regional compliance documentation.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message