Equivalent & Substitute Parts for 5TT 1.6-R Glass Cartridge Fuse

Part Overview

The 5TT 1.6-R is a 1.6 A, 250 V AC/DC slow-blow glass cartridge fuse manufactured by Bel Fuse Inc. in a 5mm x 20mm package format. This component is classified as Active product status and requires a fuse holder for installation. Alternative equivalent parts may be necessary due to inventory availability, regional certification requirements, or specific application compliance needs.

Key Parameters

Parameter	Value
Current Rating	1.6 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Slow Blow
Package / Case	5mm x 20mm
Mounting Type	Requires Holder
Operating Temperature Range	-55°C ~ 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 5TT 1.6-R is determined by the following mandatory parameters:

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

All substitute parts listed below meet these mandatory criteria. Variations in Breaking Capacity, Melting I²t, DC Cold Resistance, and approval certifications do not prevent substitution when the above parameters are identical.

Parameter Comparison

Part Number	Manufacturer	Current Rating (A)	Voltage Rating (V AC)	Response Time	Package	Breaking Capacity @ Rated Voltage (A)	Melting I²t	DC Cold Resistance (Ohms)	Approval Agencies	Product Status
5TT 1.6-R	Bel Fuse Inc.	1.6	250	Slow Blow	5mm x 20mm	100	19.7	0.12	CE, CSA, cULus, PSE	Active
5ET 1.6-R	Bel Fuse Inc.	1.6	250	Slow Blow	5mm x 20mm	150	62	0.059	CCC, CE, CSA, cURus, SEMKO, VDE	Active
5ST 1.6-R	Bel Fuse Inc.	1.6	250	Slow Blow	5mm x 20mm	35	6.9	0.04	CCC, CE, CSA, cURus, IMQ, SEMKO, VDE	Active
023901.6HXP	Littelfuse Inc.	1.6	250	Slow Blow	5mm x 20mm	100	30.43	0.1205	CE, CSA, KC, PSE, UL	Active
023901.6MXP	Littelfuse Inc.	1.6	250	Slow Blow	5mm x 20mm	100	30.43	0.1205	CE, CSA, KC, PSE, UL	Active

Engineering Selection Recommendations

All listed substitute parts maintain Active product status and are ROHS3 compliant. Selection between equivalent parts should be based on regional certification requirements and application-specific compliance mandates:

For applications requiring CCC, SEMKO, or VDE certification: 5ET 1.6-R or 5ST 1.6-R (Bel Fuse Inc. series)
For applications requiring KC or UL certification: 023901.6HXP or 023901.6MXP (Littelfuse Inc. series)
For applications with PSE certification requirement: All listed parts are acceptable
For applications with CSA certification requirement: All listed parts are acceptable

Breaking Capacity and Melting I²t values vary across substitutes. Verify that the selected part's Breaking Capacity meets or exceeds the circuit protection requirements of the target application.

Frequently Asked Questions (FAQ)

Q: Can 5ET 1.6-R replace 5TT 1.6-R in any application?

A: Yes, provided the application does not have specific Breaking Capacity or Melting I²t constraints that require the exact characteristics of the 5TT 1.6-R. Both parts share identical current rating, voltage rating, response time, and package dimensions.

Q: What is the difference between Bel Fuse Inc. and Littelfuse Inc. equivalents?

A: Both manufacturers produce 1.6 A, 250 V AC/DC slow-blow glass cartridge fuses in 5mm x 20mm packages. Differences exist in Breaking Capacity, Melting I²t, DC Cold Resistance, and regional approval certifications. Littelfuse parts (023901.6HXP, 023901.6MXP) carry KC and UL certifications, while Bel Fuse parts carry CCC, SEMKO, and VDE certifications.

Q: Are there mechanical compatibility issues when substituting between manufacturers?

A: No. All listed parts conform to the 5mm x 20mm package specification and require a fuse holder for installation. Physical dimensions are equivalent within tolerance.

Q: Which substitute has the lowest DC Cold Resistance?

A: The 5ST 1.6-R has the lowest DC Cold Resistance at 0.04 Ohms. The 5ET 1.6-R has 0.059 Ohms. Littelfuse parts (023901.6HXP and 023901.6MXP) have 0.1205 Ohms.

Q: Can I use these fuses in circuits rated for higher breaking capacity?

A: Breaking Capacity indicates the maximum fault current the fuse can safely interrupt. Using a fuse with lower Breaking Capacity than the circuit fault level may result in fuse rupture or failure to clear the fault. Verify that the selected part's Breaking Capacity meets circuit requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed parts are ROHS3 compliant and REACH unaffected.

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