Littelfuse 0225.100H Equivalent & Substitute Parts

Part Overview

The Littelfuse 0225.100H is a 100 mA, 250 V AC/DC fast-blow glass cartridge fuse in 2AG package format (5mm x 15mm). This component requires a fuse holder for installation and is designed for circuit protection applications requiring fast response characteristics. The part is classified as obsolete, making identification of active equivalent components essential for ongoing system support and procurement.

Key Parameters

Parameter	Value
Current Rating	100 mA
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Package / Case	2AG, 5mm x 15mm
Response Time	Fast Blow
Breaking Capacity @ Rated Voltage	35A
Mounting Type	Requires Holder
Approval Agency	CSA, UL
Operating Temperature Range	-55°C ~ 125°C

Substitute Part Grouping Explanation

Substitution of the Littelfuse 0225.100H is determined by strict equivalence across the following critical parameters:

Current Rating: 100 mA (exact match required)
Voltage Rating: 250 V AC (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Package / Case: 2AG, 5mm x 15mm (exact match required)
Response Time: Fast Blow (exact match required)
Breaking Capacity: 35A (exact match required)
Approval Agencies: CSA and UL certification (required for regulatory compliance)

The Eaton Electronics Division BK/C520-100-R meets all substitution criteria. Both components share identical electrical ratings, response characteristics, and mechanical package specifications. The substitute part is currently in active production status, addressing the obsolescence of the original Littelfuse component.

Parameter Comparison

Parameter	Littelfuse 0225.100H	Eaton BK/C520-100-R	Match Status
Current Rating (Amps)	100 mA	100 mA	Equivalent
Voltage Rating - AC	250 V	250 V	Equivalent
Fuse Type	Cartridge, Glass	Cartridge, Glass	Equivalent
Package / Case	2AG, 5mm x 15mm	2AG, 5mm x 15mm	Equivalent
Response Time	Fast Blow	Fast Blow	Equivalent
Breaking Capacity @ Rated Voltage	35A	35A	Equivalent
Mounting Type	Requires Holder	Requires Holder	Equivalent
Approval Agency	CSA, UL	CSA, UL	Equivalent
Melting I²t	0.00075	0.001	Minor Variation
DC Cold Resistance	6.15 Ohms	22.3 Ohms	Minor Variation
RoHS Status	RoHS non-compliant	ROHS3 Compliant	Substitute Improved
Product Status	Obsolete	Active	Substitute Active

Engineering Selection Recommendations

The Eaton BK/C520-100-R is the direct functional equivalent for the obsolete Littelfuse 0225.100H. Selection is based on the following engineering factors:

Electrical Equivalence: Both components provide identical current and voltage ratings with matching fast-blow response characteristics and breaking capacity specifications. The minor variations in melting I²t (0.00075 vs 0.001) and DC cold resistance (6.15 Ohms vs 22.3 Ohms) remain within acceptable tolerance for circuit protection applications where these components are interchangeable.

Regulatory Compliance: Both components carry CSA and UL approvals, meeting the same certification standards required for circuit protection in regulated applications.

Product Status: The substitute part is in active production, ensuring long-term availability and supply chain continuity compared to the obsolete original component.

Environmental Compliance: The Eaton substitute achieves ROHS3 compliance, providing improved environmental compliance compared to the non-compliant original part.

Package Compatibility: Both components use the identical 2AG, 5mm x 15mm package format, ensuring direct mechanical compatibility with existing fuse holders without modification.

Frequently Asked Questions (FAQ)

Q: Can the Eaton BK/C520-100-R be used as a direct replacement for the Littelfuse 0225.100H?

A: Yes. Both components share identical electrical ratings (100 mA, 250 V AC), fuse type (cartridge, glass), package format (2AG, 5mm x 15mm), response time (fast blow), and breaking capacity (35A). Both carry CSA and UL approvals. The components are mechanically and electrically interchangeable.

Q: What is the significance of the difference in DC cold resistance between the two parts?

A: The DC cold resistance values (6.15 Ohms vs 22.3 Ohms) represent minor variations in fuse element design. These variations do not affect the functional equivalence of the components for circuit protection applications, as both maintain identical current and voltage ratings and response characteristics.

Q: Does the difference in melting I²t affect substitution compatibility?

A: No. The melting I²t values (0.00075 vs 0.001) represent minor variations in thermal characteristics. Both components maintain identical fast-blow response time and breaking capacity specifications, ensuring equivalent circuit protection performance.

Q: Why is the Eaton part listed as ROHS3 compliant while the Littelfuse part is not?

A: The Littelfuse 0225.100H is an obsolete component manufactured under earlier standards. The Eaton BK/C520-100-R represents current production and meets modern environmental compliance requirements. This improvement does not affect electrical or mechanical compatibility.

Q: Are there any installation considerations when switching to the Eaton substitute?

A: No. Both components require the same 2AG fuse holder and use identical package dimensions (5mm x 15mm). No modifications to existing installations or fuse holders are necessary.

Q: What is the inventory status of the substitute part?

A: The Eaton BK/C520-100-R is in active production with 1757 pieces available in new original stock, ensuring reliable procurement compared to the obsolete Littelfuse component.

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