Littelfuse 021301.6M Glass Cartridge Fuse 1.6A 250VAC 5x20mm Equivalent & Substitute Parts

Part Overview

The Littelfuse 021301.6M is a 1.6A 250VAC glass cartridge fuse in 5x20mm form factor, designed for circuit protection in AC/DC applications. This part carries an obsolete product status, making identification of active equivalent and substitute components essential for ongoing design support and procurement continuity. Equivalent parts maintain identical electrical and mechanical specifications, while substitutes offer functional compatibility within defined parameter tolerances.

Key Parameters

Parameter	Specification
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 to 125°C
Breaking Capacity @ Rated Voltage	35A

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict alignment with the following core parameters: current rating (1.6A), voltage rating (250VAC), fuse type (cartridge glass), package dimensions (5x20mm), response time (slow blow), and mounting configuration (requires holder). All listed substitutes maintain these baseline specifications. Variations in breaking capacity, melting I²t, DC cold resistance, and approval agencies are documented but do not disqualify functional equivalence within the specified electrical envelope. Parts are grouped by manufacturer and product status to facilitate procurement decisions.

Parameter Comparison

Part Number	Manufacturer	Current (A)	Voltage (VAC)	Package	Response Time	Breaking Capacity (A)	Melting I²t	Product Status	RoHS Status
021301.6M	Littelfuse Inc.	1.6	250	5x20mm	Slow Blow	35	44.2	Obsolete	Non-compliant
021301.6MXP	Littelfuse Inc.	1.6	250	5x20mm	Slow Blow	35	44.2	Active	ROHS3 Compliant
0034.3119	SCHURTER Inc.	1.6	250	5x20mm	Slow Blow	35	10.5	Active	ROHS3 Compliant
0034.5619.11	SCHURTER Inc.	1.6	250	5x20mm	Slow Blow	35	10.5	Active	ROHS3 Compliant
0034.5619.22	SCHURTER Inc.	1.6	250	5x20mm	Slow Blow	35	10.5	Active	ROHS3 Compliant
5ET 1.6-R	Bel Fuse Inc.	1.6	250	5x20mm	Slow Blow	150	62	Active	ROHS3 Compliant
5ST 1.6-R	Bel Fuse Inc.	1.6	250	5x20mm	Slow Blow	35	6.9	Active	ROHS3 Compliant
5TT 1.6-R	Bel Fuse Inc.	1.6	250	5x20mm	Slow Blow	100	19.7	Active	ROHS3 Compliant
BK/GDC-1.6A	Eaton - Electronics Division	1.6	250	5x20mm	Slow Blow	35	21.7	Active	ROHS3 Compliant
BK/GMD-1.6-R	Eaton - Electronics Division	1.6	250	5x20mm	Slow Blow	100	27	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (Littelfuse Ecosystem): The 021301.6MXP is the active production equivalent of the obsolete 021301.6M, maintaining identical electrical specifications and melting I²t characteristics. This part is ROHS3 compliant and recommended as the primary replacement path for existing designs.

SCHURTER Alternatives: The 0034.3119 series (including 0034.5619.11 and 0034.5619.22 variants) provides functional substitution with lower melting I²t values (10.5 vs. 44.2), indicating faster response characteristics. These parts are suitable for applications where tighter thermal protection is acceptable. The 0034.5619.22 is supplied in Tape & Reel packaging for automated assembly environments.

Bel Fuse Options: The 5ST 1.6-R offers the closest melting I²t match (6.9) among active alternatives and carries the broadest approval agency coverage (CCC, CE, CSA, cURus, IMQ, SEMKO, VDE). The 5TT 1.6-R and 5ET 1.6-R provide higher breaking capacities (100A and 150A respectively) for applications requiring enhanced fault current handling.

Eaton Alternatives: The BK/GDC-1.6A maintains a melting I²t of 21.7, positioning it between SCHURTER and Littelfuse thermal response profiles. The BK/GMD-1.6-R offers 100A breaking capacity with higher melting I²t (27) for applications requiring extended thermal margin.

All listed substitutes are active production parts with ROHS3 compliance, ensuring long-term availability and regulatory alignment.

Frequently Asked Questions (FAQ)

Q: Can I directly replace the obsolete 021301.6M with any of these substitutes?

A: The 021301.6MXP is the direct equivalent and recommended primary replacement. Other substitutes are functionally compatible within the 1.6A 250VAC 5x20mm envelope but exhibit different melting I²t characteristics that may affect circuit protection timing. Verify application thermal requirements before selecting alternatives.

Q: What is the significance of melting I²t differences between substitutes?

A: Melting I²t defines the thermal energy required to melt the fuse element. Lower values (SCHURTER 10.5) indicate faster response to overcurrent; higher values (Bel Fuse 5ET at 62) provide greater thermal margin. Selection depends on circuit load characteristics and protection strategy.

Q: Are all substitutes available in the same packaging options?

A: No. The 0034.5619.22 is supplied in Tape & Reel format for automated assembly, while most others are available in bulk packaging. Verify packaging availability with your supplier for production requirements.

Q: Which substitute has the broadest approval agency coverage?

A: The Bel Fuse 5ST 1.6-R carries certifications from CCC, CE, CSA, cURus, IMQ, SEMKO, and VDE, providing the widest regulatory acceptance across global markets.

Q: Do all substitutes maintain the same breaking capacity as the original?

A: No. The original 021301.6M and most substitutes are rated at 35A breaking capacity. However, the Bel Fuse 5ET 1.6-R (150A) and 5TT 1.6-R (100A), plus Eaton BK/GMD-1.6-R (100A), offer higher breaking capacities for applications with elevated fault current exposure.

Q: Is RoHS compliance a factor in substitute selection?

A: Yes. The original 021301.6M is RoHS non-compliant. All listed active substitutes are ROHS3 compliant, making them suitable for applications subject to RoHS regulations. This is a key advantage for new designs and regulated markets.

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