5STP 3.15 Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The 5STP 3.15 is a 3.15 A, 250 V AC/DC slow-blow glass cartridge fuse in 5mm x 20mm axial package manufactured by Bel Fuse Inc. This part is classified as obsolete. Equivalent and substitute parts are available from active product lines that maintain the same electrical and mechanical specifications, enabling direct replacement in circuit protection applications.

Key Parameters

Parameter	Value
Current Rating	3.15 A
Voltage Rating (AC)	250 V
Response Time	Slow Blow
Package / Case	5mm x 20mm (Axial)
Fuse Type	Cartridge, Glass
Mounting Type	Through Hole
Operating Temperature Range	-55°C ~ 125°C

Substitute Part Grouping Explanation

Substitution eligibility is determined by matching the following critical parameters:

Current Rating: 3.15 A
Voltage Rating (AC): 250 V
Response Time: Slow Blow
Package / Case: 5mm x 20mm (Axial)
Fuse Type: Cartridge, Glass
Mounting Type: Through Hole
Operating Temperature Range: -55°C ~ 125°C

All substitute parts listed maintain these core electrical and mechanical specifications. Variations in breaking capacity, melting I²t, DC cold resistance, and physical dimensions within tolerance are acceptable for functional equivalence.

Parameter Comparison

Manufacturer	Part Number	Series	Current (A)	Voltage (V AC)	Response Time	Package	Breaking Capacity (A)	Melting I²t	Product Status	RoHS Status
Bel Fuse Inc.	5STP 3.15	5STP	3.15	250	Slow Blow	5mm x 20mm	35	33	Obsolete	RoHS non-compliant
Bel Fuse Inc.	5STP 3.15-R	5STP	3.15	250	Slow Blow	5mm x 20mm	35	33	Active	ROHS3 Compliant
Bel Fuse Inc.	5ETP 3.15-R	5ETP	3.15	250	Slow Blow	5mm x 20mm	150	203	Active	ROHS3 Compliant
SCHURTER Inc.	0034.3122.PT	FST 5x20	3.15	250	Slow Blow	5mm x 20mm	35	47	Active	ROHS3 Compliant
Littelfuse Inc.	02183.15MXEP	218	3.15	250	Slow Blow	5mm x 20mm	35	38.15	Active	ROHS3 Compliant

Engineering Selection Recommendations

For applications currently using the obsolete 5STP 3.15, the following selection criteria apply:

Direct Replacement (Same Manufacturer): The 5STP 3.15-R from Bel Fuse Inc. is the primary substitute. It maintains identical electrical specifications and breaking capacity while offering active product status and ROHS3 compliance.

Alternative Manufacturers: The 5ETP 3.15-R (Bel Fuse Inc.), 0034.3122.PT (SCHURTER Inc.), and 02183.15MXEP (Littelfuse Inc.) are functionally equivalent. All maintain the required 3.15 A, 250 V AC/DC slow-blow characteristics and 5mm x 20mm package dimensions. Selection among these alternatives may be based on supply availability, certification requirements, or existing supplier relationships.

Compliance Considerations: All active substitute parts are ROHS3 compliant, addressing regulatory requirements that the original obsolete part does not meet. Certification coverage varies by manufacturer; verify that the selected substitute meets all required approval agencies for your application (CE, CSA, UL, VDE, etc.).

Frequently Asked Questions (FAQ)

Q: Can I use 5STP 3.15-R as a direct replacement for 5STP 3.15?

A: Yes. The 5STP 3.15-R maintains identical electrical and mechanical specifications. The primary difference is product status (active vs. obsolete) and RoHS compliance (ROHS3 vs. non-compliant).

Q: What is the difference between 5STP 3.15-R and 5ETP 3.15-R?

A: Both are 3.15 A, 250 V slow-blow fuses in 5mm x 20mm packages. The 5ETP series has higher breaking capacity (150 A vs. 35 A) and higher melting I²t (203 vs. 33). The 5ETP is suitable for applications requiring enhanced fault current handling.

Q: Are SCHURTER 0034.3122.PT and Littelfuse 02183.15MXEP compatible with the original 5STP 3.15?

A: Yes. Both parts match the critical electrical parameters (3.15 A, 250 V AC/DC, slow-blow) and package dimensions (5mm x 20mm). Physical dimensions vary slightly within tolerance; verify mechanical fit in your specific application.

Q: Which substitute part should I select for new designs?

A: For new designs, select from active product lines with ROHS3 compliance. The 5STP 3.15-R is recommended for continuity with existing Bel Fuse designs. Alternative manufacturers offer equivalent performance and may provide supply advantages.

Q: Do all substitute parts have the same approval certifications?

A: No. Certification coverage differs by manufacturer. Verify that your selected substitute meets all required approval agencies for your application. Common certifications include CE, CSA, UL, and VDE.

Q: Can I interchange these fuses without circuit redesign?

A: Yes, provided the selected substitute meets your application's voltage, current, response time, and certification requirements. All listed substitutes maintain the same 5mm x 20mm through-hole package and -55°C to 125°C operating temperature range.

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