5ET 1.6-R Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The 5ET 1.6-R is a 1.6 A, 250 V AC/DC glass cartridge fuse manufactured by Bel Fuse Inc. in a 5mm x 20mm form factor with slow blow response characteristics. This component is classified as Active product status and is designed for applications requiring overcurrent protection in industrial and commercial equipment. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, response time classification, and regulatory approvals to ensure functional interchangeability within specified application parameters.

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
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 5ET 1.6-R is determined by the following critical parameters:

Primary Matching Criteria:

Current Rating: 1.6 A (exact match required)
Voltage Rating (AC): 250 V (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)

Secondary Compatibility Factors:

Response Time Classification: Slow Blow or Medium Blow (within acceptable operating envelope)
Operating Temperature Range: -55°C ~ 125°C (minimum requirement)
RoHS3 Compliance: Required for environmental and regulatory conformance
Regulatory Approvals: Certifications must include applicable regional standards (CCC, CE, CSA, cURus, UL, VDE, PSE)

Parts meeting all primary criteria are classified as parametric equivalents or direct manufacturers. Parts with variations in secondary factors (breaking capacity, melting I²t, DC cold resistance) are classified as similar substitutes and require application-specific validation.

Parameter Comparison

Parameter	5ET 1.6-R (Bel Fuse)	5ST 1.6-R (Bel Fuse)	5TT 1.6-R (Bel Fuse)	021901.6MXAP (Littelfuse)	021801.6MXP (Littelfuse)	BK1/GMC-1.6-R (Eaton)
Current Rating (A)	1.6	1.6	1.6	1.6	1.6	1.6
Voltage Rating (AC)	250 V	250 V	250 V	250 V	250 V	250 V
Package / Case	5mm x 20mm	5mm x 20mm	5mm x 20mm	5mm x 20mm	5mm x 20mm	5mm x 20mm
Fuse Type	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass
Response Time	Slow Blow	Slow Blow	Slow Blow	Slow Blow	Slow Blow	Medium Blow
Breaking Capacity @ Rated Voltage	150 A	35 A	100 A	150 A	35 A	100 A
Melting I²t	62	6.9	19.7	44.2	23.35	5.8
DC Cold Resistance (Ohms)	0.059	0.04	0.12	0.0551	0.0336	0.067
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	Not specified
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Parametric Equivalents (Direct Substitution):

5ST 1.6-R and 5TT 1.6-R from Bel Fuse Inc. are parametric equivalents meeting all primary matching criteria. Both maintain identical current, voltage, and package specifications. Selection between these variants depends on breaking capacity requirements: 5ST 1.6-R provides 35 A breaking capacity with lower melting I²t (6.9), while 5TT 1.6-R provides 100 A breaking capacity with higher melting I²t (19.7). Both are ROHS3 compliant and Active status.

021901.6MXAP from Littelfuse Inc. is a direct manufacturer equivalent with matching electrical and mechanical parameters. Breaking capacity of 150 A and melting I²t of 44.2 align with the main part specification. Regulatory approvals include CCC, CE, CSA, PSE, SEMKO, UL, and VDE, providing comprehensive regional compliance.

Similar Substitutes (Application-Dependent):

021801.6MXP from Littelfuse Inc. is classified as a similar substitute with identical current and voltage ratings but reduced breaking capacity (35 A) and lower melting I²t (23.35). This part is suitable for applications where lower fault current handling is acceptable. Regulatory approvals include CCC, CE, CSA, K-MARK, PSE, SEMKO, UL, and VDE.

BK1/GMC-1.6-R from Eaton Electronics Division is a similar substitute with Medium Blow response time classification, differing from the Slow Blow characteristic of the main part. Breaking capacity of 100 A and melting I²t of 5.8 indicate different thermal response. Regulatory approvals are limited to CSA and UL. Operating temperature range is not specified. This part requires application-specific validation to confirm compatibility with circuit protection requirements.

All substitute parts maintain ROHS3 compliance and Active product status, ensuring environmental and supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can 5ST 1.6-R and 5TT 1.6-R be used interchangeably with 5ET 1.6-R?

A: Both parts meet primary matching criteria (1.6 A, 250 V, 5mm x 20mm, Cartridge Glass, Slow Blow). Selection depends on breaking capacity requirements. 5ST 1.6-R provides 35 A breaking capacity; 5TT 1.6-R provides 100 A. Confirm application fault current levels before substitution.

Q: What is the difference between Littelfuse 021901.6MXAP and 021801.6MXP?

A: Both are 1.6 A, 250 V glass cartridge fuses in 5mm x 20mm packages. 021901.6MXAP provides 150 A breaking capacity with melting I²t of 44.2. 021801.6MXP provides 35 A breaking capacity with melting I²t of 23.35. Selection depends on circuit fault current specifications.

Q: Is BK1/GMC-1.6-R a direct substitute for 5ET 1.6-R?

A: BK1/GMC-1.6-R matches current, voltage, and package specifications but has Medium Blow response time versus Slow Blow for 5ET 1.6-R. Melting I²t is significantly lower (5.8 versus 62). This part requires application-specific validation to confirm circuit protection compatibility.

Q: What regulatory approvals are critical for my application?

A: Regulatory requirements depend on end-use geography and industry standards. 021901.6MXAP provides the broadest approval coverage (CCC, CE, CSA, PSE, SEMKO, UL, VDE). Confirm required certifications with your application specifications before final part selection.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance, ensuring environmental conformance and supply chain compatibility with modern manufacturing standards.

Q: What is the significance of melting I²t values in fuse selection?

A: Melting I²t indicates the thermal energy required to melt the fuse element. Higher values indicate slower thermal response. 5ET 1.6-R (62) and 021901.6MXAP (44.2) provide higher thermal capacity than 5ST 1.6-R (6.9) and BK1/GMC-1.6-R (5.8). Application circuit characteristics determine appropriate thermal response classification.

Q: Can I substitute a Medium Blow fuse for a Slow Blow fuse?

A: Response time classification affects circuit protection behavior. Medium Blow fuses operate faster than Slow Blow fuses. Substitution requires validation that circuit inrush currents and fault protection requirements remain within acceptable parameters. BK1/GMC-1.6-R (Medium Blow) should not be assumed compatible with 5ET 1.6-R (Slow Blow) applications without engineering review.

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