Bel Fuse Inc. 5VT 1.6 Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Bel Fuse Inc. 5VT 1.6 is a 1.6 A, 250 V AC/DC slow blow glass cartridge fuse in a 5mm x 20mm form factor, designed for use with a fuse holder. This part is classified as obsolete. Equivalent and substitute parts are necessary to maintain circuit protection functionality in applications where the original 5VT 1.6 is no longer available or where design updates require active product alternatives with enhanced compliance certifications.

Key Parameters

Parameter	Value
Manufacturer Part Number	5VT 1.6
Manufacturer	Bel Fuse Inc.
Current Rating	1.6 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 ~ 125°C
Breaking Capacity @ Rated Voltage	35 A
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict adherence to the following parameters:

Critical Parameters (Must Match):

Current Rating: 1.6 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 ~ 125°C

Allowable Variations:

Breaking Capacity @ Rated Voltage: May vary (35 A to 150 A acceptable)
DC Cold Resistance: Minor variations permitted (0.04 Ω to 0.12 Ω range)
Melting I²t: Variations permitted (6.9 to 62)
Approval Agencies: May differ or expand
RoHS Status: Active products preferred over obsolete

Substitute parts are grouped into two categories: Parametric Equivalents (all critical parameters match) and Similar Parts (meet core electrical requirements with minor dimensional or performance variations).

Parameter Comparison

Part Number	Manufacturer	Current Rating (A)	Voltage (V AC)	Response Time	Package	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ω)	Product Status	RoHS Status
5VT 1.6	Bel Fuse Inc.	1.6	250	Slow Blow	5mm x 20mm	35	62	0.06	Obsolete	Non-compliant
5ET 1.6-R	Bel Fuse Inc.	1.6	250	Slow Blow	5mm x 20mm	150	62	0.059	Active	ROHS3 Compliant
5ST 1.6-R	Bel Fuse Inc.	1.6	250	Slow Blow	5mm x 20mm	35	6.9	0.04	Active	ROHS3 Compliant
5TT 1.6-R	Bel Fuse Inc.	1.6	250	Slow Blow	5mm x 20mm	100	19.7	0.12	Active	ROHS3 Compliant
021801.6MXBP	Littelfuse Inc.	1.6	250	Slow Blow	5mm x 20mm	35	23.35	0.0336	Active	ROHS3 Compliant
021801.6MXP	Littelfuse Inc.	1.6	250	Slow Blow	5mm x 20mm	35	23.35	0.0336	Active	ROHS3 Compliant
021901.6MXAP	Littelfuse Inc.	1.6	250	Slow Blow	5mm x 20mm	150	44.2	0.0551	Active	ROHS3 Compliant
BK1/GMC-1.6-R	Eaton - Electronics Division	1.6	250	Medium Blow	5mm x 20mm	100	5.8	0.067	Active	ROHS3 Compliant
GDC-1.6A	Eaton - Electronics Division	1.6	250	Slow Blow	5mm x 20mm	35	21.7	0.0425	Active	ROHS3 Compliant

Engineering Selection Recommendations

Parametric Equivalents (Preferred for Direct Replacement):

The 5ET 1.6-R, 5ST 1.6-R, and 5TT 1.6-R from Bel Fuse Inc. are parametric equivalents meeting all critical electrical and mechanical specifications. All three are active products with ROHS3 compliance, addressing the obsolescence and compliance limitations of the 5VT 1.6. Selection among these three depends on breaking capacity requirements: 5ET 1.6-R (150 A), 5ST 1.6-R (35 A), or 5TT 1.6-R (100 A).

Cross-Manufacturer Alternatives:

Littelfuse Inc. parts 021801.6MXBP, 021801.6MXP, and 021901.6MXAP meet all critical parameters with active product status and ROHS3 compliance. These parts feature slightly larger physical dimensions (5.20mm diameter vs. 5.10mm) but remain compatible with standard 5mm x 20mm fuse holders. Breaking capacity options range from 35 A to 150 A.

Eaton Electronics Division parts BK1/GMC-1.6-R and GDC-1.6A are functionally compatible. Note that BK1/GMC-1.6-R specifies Medium Blow response time rather than Slow Blow; this variation may affect circuit protection timing characteristics and should be evaluated against application requirements.

Compliance Considerations:

All recommended substitutes carry ROHS3 compliance, addressing the non-compliant status of the obsolete 5VT 1.6. Approval agency certifications expand across all alternatives, including CCC, CE, CSA, UL, VDE, and PSE certifications depending on the selected part.

Frequently Asked Questions (FAQ)

Q: Can I use a part with a different breaking capacity than the original 5VT 1.6?

A: Yes. The 5VT 1.6 has a 35 A breaking capacity. Substitutes with higher breaking capacities (100 A or 150 A) provide enhanced fault current handling and are electrically compatible. Lower breaking capacities are not acceptable.

Q: What is the difference between Slow Blow and Medium Blow response times?

A: Response time determines how quickly the fuse element melts under overcurrent conditions. Slow Blow fuses tolerate brief current surges before opening, while Medium Blow fuses respond faster. The BK1/GMC-1.6-R uses Medium Blow; verify this timing is acceptable for your application before substitution.

Q: Are Littelfuse parts with 5.20mm diameter compatible with 5mm x 20mm fuse holders?

A: Yes. The 5.20mm diameter variation is within acceptable tolerance for standard 5mm x 20mm fuse holder specifications. Physical compatibility is maintained.

Q: Why is RoHS compliance important for this substitution?

A: The original 5VT 1.6 is RoHS non-compliant. All recommended substitutes are ROHS3 compliant, meeting current environmental and regulatory requirements for electronic component manufacturing and use.

Q: Can I substitute the 5VT 1.6 with the SCHURTER 0034.3119.G?

A: The SCHURTER 0034.3119.G is a board mount fuse, not a cartridge fuse requiring a holder. This represents a different mounting architecture and is not a direct substitute for the 5VT 1.6 without circuit redesign.

Q: Which substitute offers the best inventory availability?

A: The 5ST 1.6-R from Bel Fuse Inc. has the highest inventory level at 8,726 pieces. The BK1/GMC-1.6-R from Eaton also maintains substantial stock at 9,060 pieces.

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