Bel Fuse Inc. 5TT 1.6 Equivalent & Substitute Parts

Part Overview

The Bel Fuse Inc. 5TT 1.6 is a 1.6 A 250 V AC/DC glass cartridge fuse in 5mm x 20mm form factor with slow-blow response characteristics. This part is classified as obsolete, making equivalent substitute parts necessary for ongoing system maintenance and new designs. The 5TT 1.6 requires a dedicated fuse holder for installation and is designed for applications requiring moderate overcurrent protection with delayed response to transient surges.

Key Parameters

Parameter	Value
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

Substitute Part Grouping Explanation

Substitute parts for the 5TT 1.6 are qualified based on the following critical parameters that must remain constant:

Current Rating: 1.6 A (exact match required)
Voltage Rating: 250 V AC (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Package / Case: 5mm x 20mm (exact match required)
Response Time: Slow Blow (exact match required)
Mounting Type: Requires Holder (exact match required)
Operating Temperature Range: -55°C ~ 125°C (minimum requirement)

The following Bel Fuse Inc. parts meet these substitution criteria: 5TT 1.6-R, 5ET 1.6-R, and 5ST 1.6-R. These parts are all active products with current manufacturing status, providing reliable alternatives to the obsolete 5TT 1.6.

Parameter Comparison

Parameter	5TT 1.6 (Main)	5TT 1.6-R	5ET 1.6-R	5ST 1.6-R
Current Rating (Amps)	1.6 A	1.6 A	1.6 A	1.6 A
Voltage Rating - AC	250 V	250 V	250 V	250 V
Fuse Type	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass
Package / Case	5mm x 20mm	5mm x 20mm	5mm x 20mm	5mm x 20mm
Response Time	Slow Blow	Slow Blow	Slow Blow	Slow Blow
Mounting Type	Requires Holder	Requires Holder	Requires Holder	Requires Holder
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Breaking Capacity @ Rated Voltage	100 A	100 A	150 A	35 A
Melting I²t	19.7	19.7	62	6.9
DC Cold Resistance	0.14 Ohms	0.12 Ohms	0.059 Ohms	0.04 Ohms
Product Status	Obsolete	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

5TT 1.6-R is the primary direct substitute for the obsolete 5TT 1.6. This part maintains identical electrical characteristics (100 A breaking capacity, 19.7 melting I²t) and is the closest parametric match. The 5TT 1.6-R is an active product with ROHS3 compliance and expanded approval certifications (CE, CSA, cULus, PSE), making it suitable for new designs and legacy system replacements.

5ET 1.6-R is a parametric equivalent offering enhanced breaking capacity (150 A) and higher melting I²t (62). This part is appropriate for applications requiring greater fault current withstand capability. The 5ET 1.6-R carries broader international certifications (CCC, CE, CSA, cURus, SEMKO, VDE) and lower DC cold resistance (0.059 Ohms).

5ST 1.6-R is a parametric equivalent with reduced breaking capacity (35 A) and lower melting I²t (6.9). This part is suitable for applications with lower fault current levels. The 5ST 1.6-R provides the most extensive certification coverage (CCC, CE, CSA, cURus, IMQ, SEMKO, VDE) and the lowest DC cold resistance (0.04 Ohms).

All substitute parts are active products with current manufacturing availability and ROHS3 compliance, eliminating the obsolescence risk associated with the original 5TT 1.6.

Frequently Asked Questions (FAQ)

Q: Can I use 5ET 1.6-R or 5ST 1.6-R as direct replacements for 5TT 1.6?

A: Yes. All three substitute parts (5TT 1.6-R, 5ET 1.6-R, 5ST 1.6-R) meet the core substitution criteria: 1.6 A current rating, 250 V AC voltage rating, cartridge glass fuse type, 5mm x 20mm package, slow-blow response, and -55°C to 125°C operating temperature. Selection depends on the application's fault current environment and required breaking capacity.

Q: What is the difference between the substitute parts?

A: The primary differences are breaking capacity and melting I²t characteristics. The 5TT 1.6-R maintains the original 100 A breaking capacity. The 5ET 1.6-R provides enhanced protection with 150 A breaking capacity and higher I²t (62). The 5ST 1.6-R is rated for lower fault currents at 35 A breaking capacity with lower I²t (6.9). DC cold resistance also varies across the three parts.

Q: Are all substitute parts RoHS compliant?

A: Yes. The 5TT 1.6-R, 5ET 1.6-R, and 5ST 1.6-R are all ROHS3 compliant, whereas the original 5TT 1.6 is RoHS non-compliant. This compliance improvement is beneficial for new designs and regulated applications.

Q: Which substitute part should I select for my application?

A: Selection is based on your system's fault current environment. If your circuit experiences fault currents up to 100 A, use 5TT 1.6-R for the closest match to the original part. For circuits with higher fault currents (up to 150 A), use 5ET 1.6-R. For circuits with lower fault currents (up to 35 A), use 5ST 1.6-R. All parts maintain identical nominal current and voltage ratings.

Q: Do these fuses require the same holder as the original 5TT 1.6?

A: Yes. All substitute parts are 5mm x 20mm cartridge fuses requiring a dedicated fuse holder. The mechanical and electrical interface is identical across all four parts.

Q: What certifications do the substitute parts carry?

A: The 5TT 1.6-R carries CE, CSA, cULus, and PSE certifications. The 5ET 1.6-R carries CCC, CE, CSA, cURus, SEMKO, and VDE certifications. The 5ST 1.6-R carries CCC, CE, CSA, cURus, IMQ, SEMKO, and VDE certifications. All parts meet international safety standards appropriate for their respective applications.

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