Littelfuse 021701.6H Glass Cartridge Fuse 1.6A 250VAC 5x20mm Equivalent & Substitute Parts

Part Overview

The Littelfuse 021701.6H is a 1.6A 250VAC fast-blow glass cartridge fuse in 5x20mm form factor, part of the Series 217 product line. This component is classified as obsolete, requiring identification of active equivalent alternatives for new designs and ongoing maintenance applications. The fuse is designed for AC/DC circuit protection in applications requiring fast response characteristics and operates across the temperature range of -55°C to 125°C. Substitute parts must maintain identical electrical ratings, mechanical dimensions, and approval certifications to ensure direct functional replacement.

Key Parameters

Parameter	Specification
Current Rating	1.6 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Fast Blow
Package / Case	5mm x 20mm
Mounting Type	Requires Holder
Breaking Capacity @ Rated Voltage	35A
Operating Temperature Range	-55°C to 125°C
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the 021701.6H is determined by strict equivalence across the following critical parameters: current rating (1.6A), voltage rating (250VAC), fuse type (cartridge glass), response time (fast blow), and physical dimensions (5x20mm). All substitute parts must maintain these core electrical and mechanical specifications to ensure functional compatibility within existing circuit protection designs.

The substitute parts are grouped into two categories based on breaking capacity and thermal characteristics:

Category A - Series 217 & 617 (35A Breaking Capacity): Parts 021701.6HXP, 021701.6MXBP, 021701.6MXP, 021701.6TXP, 021701.6VXP, and 061701.6MXP maintain the original 35A breaking capacity and 4.615 melting I²t value, providing direct electrical equivalence to the 021701.6H.

Category B - Series 235 (100A Breaking Capacity): Parts 023501.6HXP, 023501.6MXP, and 023501.6VXP feature enhanced 100A breaking capacity and reduced 2.025 melting I²t value, suitable for applications requiring higher fault current protection.

Category C - Alternative Manufacturer: Part BK/GDB-1.6A from Eaton Electronics Division provides equivalent current and voltage ratings with different thermal characteristics (1.6 melting I²t).

Parameter Comparison

Part Number	Manufacturer	Series	Current (A)	Voltage (V)	Breaking Capacity (A)	Melting I²t	DC Cold Resistance (Ω)	Product Status	RoHS Status
021701.6H	Littelfuse Inc.	217	1.6	250	35	4.616	0.053	Obsolete	Non-compliant
021701.6HXP	Littelfuse Inc.	217	1.6	250	35	4.615	0.0528	Active	ROHS3 Compliant
021701.6MXBP	Littelfuse Inc.	217	1.6	250	35	4.615	0.0528	Active	ROHS3 Compliant
021701.6MXP	Littelfuse Inc.	217	1.6	250	35	4.615	0.0528	Active	ROHS3 Compliant
021701.6TXP	Littelfuse Inc.	217	1.6	250	35	4.615	0.0528	Active	ROHS3 Compliant
021701.6VXP	Littelfuse Inc.	217	1.6	250	35	4.615	0.0528	Active	ROHS3 Compliant
023501.6HXP	Littelfuse	235	1.6	250	100	2.025	0.0758	Active	ROHS3 Compliant
023501.6MXP	Littelfuse	235	1.6	250	100	2.025	0.0758	Active	ROHS3 Compliant
023501.6VXP	Littelfuse Inc.	235	1.6	250	100	2.025	0.0758	Active	ROHS3 Compliant
061701.6MXP	Littelfuse Inc.	617	1.6	250	35	4.615	0.0528	Active	ROHS3 Compliant
BK/GDB-1.6A	Eaton - Electronics Division	GDB	1.6	250	35	1.6	0.066	Active	RoHS Compliant

Engineering Selection Recommendations

For direct replacement of the obsolete 021701.6H in existing designs, select from the active Littelfuse Series 217 variants: 021701.6HXP, 021701.6MXBP, 021701.6MXP, 021701.6TXP, or 021701.6VXP. These parts maintain identical electrical characteristics, 35A breaking capacity, and thermal response while offering ROHS3 compliance and active product status. All variants carry equivalent approval certifications including CCC, CE, CSA, K-MARK, PSE, SEMKO, UL, and VDE.

For applications requiring enhanced fault current protection capability, the Littelfuse Series 235 alternatives (023501.6HXP, 023501.6MXP, 023501.6VXP) provide 100A breaking capacity with reduced melting I²t. These parts are suitable when circuit design permits higher breaking capacity without affecting protection coordination.

The Littelfuse Series 617 part 061701.6MXP offers equivalent performance to Series 217 with identical breaking capacity and thermal characteristics, suitable for applications where Series 617 qualification is required.

The Eaton BK/GDB-1.6A provides cross-manufacturer equivalence with identical current and voltage ratings. This option is appropriate when multi-source qualification or Eaton component standardization is required, noting the different melting I²t characteristic (1.6 versus 4.615).

Frequently Asked Questions (FAQ)

Q: Can Series 235 parts (023501.6HXP, 023501.6MXP, 023501.6VXP) be used as direct replacements for the 021701.6H?

A: Series 235 parts are electrically equivalent in current and voltage ratings but feature different thermal characteristics. The 100A breaking capacity and 2.025 melting I²t differ from the original 35A breaking capacity and 4.616 melting I²t. These parts are suitable only when circuit design analysis confirms compatibility with the enhanced breaking capacity and modified thermal response.

Q: What is the difference between the various Littelfuse Series 217 part numbers (HXP, MXBP, MXP, TXP, VXP)?

A: All Series 217 variants maintain identical electrical specifications, breaking capacity, and thermal characteristics. Differences are limited to packaging configuration and internal manufacturing process designations. Selection among these variants depends on packaging requirements and inventory availability.

Q: Is the Eaton BK/GDB-1.6A a suitable replacement for the 021701.6H?

A: The Eaton part matches current and voltage ratings and physical dimensions. However, the melting I²t value (1.6) differs significantly from the Littelfuse 021701.6H (4.616). This part is suitable only when cross-manufacturer qualification has been completed and thermal response differences are acceptable for the application.

Q: Are all substitute parts RoHS compliant?

A: All active Littelfuse substitute parts (Series 217, 235, and 617) are ROHS3 compliant. The original 021701.6H is RoHS non-compliant. The Eaton BK/GDB-1.6A is RoHS compliant. Compliance status must be verified against specific application requirements.

Q: What approval certifications are maintained across substitute parts?

A: All Littelfuse Series 217 and 617 parts carry CCC, CE, CSA, K-MARK, PSE, SEMKO, UL, and VDE certifications. Series 235 parts carry CE, CSA, KC, PSE, and UL certifications. The Eaton part carries UL and VDE certifications. Application-specific certification requirements must be confirmed before selection.

Q: Can substitute parts be used in the same fuse holder as the 021701.6H?

A: All substitute parts maintain the identical 5x20mm physical dimensions and require the same holder type. Mechanical compatibility is assured across all listed alternatives.

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