Equivalent & Substitute Parts for 5VT 3.15 Glass Cartridge Fuse

Part Overview

The Bel Fuse Inc. 5VT 3.15 is a 3.15 A, 250 V AC/DC slow-blow glass cartridge fuse in 5mm x 20mm form factor, designed for circuits requiring holder-mounted protection. This part is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain electrical and mechanical compatibility within the same package class and performance envelope.

Key Parameters

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

Substitute Part Grouping Explanation

Substitution eligibility for the 5VT 3.15 is determined by strict equivalence across the following parameters:

Current Rating: 3.15 A (exact match required)
Voltage Rating: 250 V AC (exact match required)
Response Time: Slow Blow (exact match required)
Package / Case: 5mm x 20mm (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Mounting Type: Requires Holder (exact match required)

All identified substitutes meet these core electrical and mechanical criteria. Variations in breaking capacity, melting I²t, DC cold resistance, and approval agencies are secondary parameters that do not preclude substitution but may influence selection based on application-specific requirements.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Current Rating (A)	Voltage Rating (V AC)	Response Time	Package / Case	Breaking Capacity @ Rated Voltage (A)	Melting I²t	DC Cold Resistance (Ohms)	Product Status	RoHS Status
5VT 3.15	Bel Fuse Inc.	3.15	250	Slow Blow	5mm x 20mm	35	203	0.022	Obsolete	RoHS non-compliant
5ET 3.15-R	Bel Fuse Inc.	3.15	250	Slow Blow	5mm x 20mm	150	203	0.022	Active	ROHS3 Compliant
5ST 3.15-R	Bel Fuse Inc.	3.15	250	Slow Blow	5mm x 20mm	35	33	0.018	Active	ROHS3 Compliant
02133.15HXP	Littelfuse Inc.	3.15	250	Slow Blow	5mm x 20mm	35	202	0.0231	Active	ROHS3 Compliant
02183.15HXP	Littelfuse Inc.	3.15	250	Slow Blow	5mm x 20mm	35	38.15	0.0173	Active	ROHS3 Compliant
02183.15TXP	Littelfuse Inc.	3.15	250	Slow Blow	5mm x 20mm	35	38.15	0.0173	Active	ROHS3 Compliant
02193.15MXAP	Littelfuse Inc.	3.15	250	Slow Blow	5mm x 20mm	150	202	0.0231	Active	ROHS3 Compliant
GDC-3.15A	Eaton - Electronics Division	3.15	250	Slow Blow	5mm x 20mm	35	96.4	0.0185	Active	ROHS3 Compliant

Engineering Selection Recommendations

All identified substitutes are electrically and mechanically compatible with the 5VT 3.15 based on matching current rating, voltage rating, response time, and package dimensions.

Bel Fuse Inc. substitutes (5ET 3.15-R, 5ST 3.15-R): Both are active products with ROHS3 compliance. The 5ET 3.15-R offers higher breaking capacity (150 A) with identical melting I²t (203) to the original part. The 5ST 3.15-R maintains the original breaking capacity (35 A) with lower melting I²t (33) and reduced DC cold resistance (0.018 Ohms).

Littelfuse Inc. substitutes (02133.15HXP, 02183.15HXP, 02183.15TXP, 02193.15MXAP): All are active products with ROHS3 compliance. The 02133.15HXP and 02183.15HXP/02183.15TXP variants maintain 35 A breaking capacity with varying melting I²t values (202 and 38.15 respectively). The 02193.15MXAP provides 150 A breaking capacity with melting I²t of 202, matching the performance envelope of the 5ET 3.15-R.

Eaton GDC-3.15A: Active product with ROHS3 compliance, 35 A breaking capacity, and melting I²t of 96.4. Approval agencies differ from Bel Fuse and Littelfuse variants.

Selection should prioritize active products with ROHS3 compliance. Breaking capacity and melting I²t variations are secondary considerations dependent on specific circuit protection requirements.

Frequently Asked Questions (FAQ)

Q: Can the 5VT 3.15 be directly replaced with any of these substitutes?

A: Yes. All listed substitutes maintain the same current rating (3.15 A), voltage rating (250 V AC), response time (slow blow), and package dimensions (5mm x 20mm). Physical and electrical compatibility is assured within the holder-mounted cartridge fuse category.

Q: What is the significance of breaking capacity differences?

A: Breaking capacity indicates the maximum fault current the fuse can safely interrupt. The 5VT 3.15 has a breaking capacity of 35 A. Substitutes with higher breaking capacity (5ET 3.15-R and 02193.15MXAP at 150 A) provide enhanced fault protection capability. Selection depends on the maximum prospective short-circuit current in the protected circuit.

Q: Why do melting I²t values vary among substitutes?

A: Melting I²t is a thermal characteristic that defines the fuse's response to overcurrent. Variations reflect different internal element designs. The 5VT 3.15 has a melting I²t of 203. Substitutes with similar values (5ET 3.15-R at 203, 02133.15HXP at 202, 02193.15MXAP at 202) provide equivalent thermal response. Lower values (5ST 3.15-R at 33, 02183.15HXP/02183.15TXP at 38.15) indicate faster thermal response.

Q: Are there RoHS compliance considerations?

A: The 5VT 3.15 is RoHS non-compliant. All active substitutes (5ET 3.15-R, 5ST 3.15-R, and all Littelfuse and Eaton variants) are ROHS3 compliant, meeting current environmental regulations for new designs and procurement.

Q: Do all substitutes fit the same holder?

A: Yes. All substitutes maintain the 5mm x 20mm package dimension and cartridge glass fuse type, ensuring compatibility with standard 5x20mm fuse holders. Physical installation requires no modification.

Q: Which substitute offers the closest electrical match to the original 5VT 3.15?

A: The 5ET 3.15-R (Bel Fuse Inc.) provides the closest match, maintaining identical current rating, voltage rating, response time, package, breaking capacity (35 A), and melting I²t (203), while offering ROHS3 compliance and active product status.

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