Littelfuse 20105000301P Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 20105000301P is a 500 mA, 250 V AC/DC glass cartridge fuse in 5mm x 20mm form factor, designed for circuit protection in electrical applications requiring medium blow response characteristics. This Active status component is cULus approved and ROHS3 compliant. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and design continuity across compatible applications.

Key Parameters

Parameter	Value
Current Rating	500 mA
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Package / Case	5mm x 20mm
Response Time	Medium Blow
Breaking Capacity @ Rated Voltage	80A (Littelfuse series); 35A (Eaton series)
Melting I²t	0.35 (Littelfuse); 0.41 (Eaton)
Approval Agency	cULus (Littelfuse); CSA, KC-MARK, UL (Eaton)
Operating Temperature Range	-25°C to 70°C (Littelfuse)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by matching the following critical parameters across all candidates:

Current Rating: 500 mA (exact match required)
Voltage Rating (AC): 250 V (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Package / Case: 5mm x 20mm nominal dimensions (within tolerance)
Response Time: Medium Blow (exact match required)
Mounting Type: Requires Holder or Through Hole (functionally compatible)

Littelfuse parts 20105000301P, 20105000001, 20105000021, and 20105000021P meet all critical parameters and are parametric equivalents within the Littelfuse 201 and 201P series. The Eaton BK/GMC-V-500-R is a manufacturer-recommended substitute that matches all electrical parameters but differs in breaking capacity and melting I²t characteristics.

Parameter Comparison

Part Number	Manufacturer	Series	Current Rating (A)	Voltage (V AC)	Package	Response Time	Breaking Capacity (A)	Melting I²t	Approval Agency	Inventory (Pcs)
20105000301P	Littelfuse Inc.	201P	0.5	250	5mm x 20mm	Medium Blow	80	0.35	cULus	880
20105000001	Littelfuse Inc.	201	0.5	250	5mm x 20mm	Medium Blow	80	0.35	cULus	2956
20105000021	Littelfuse Inc.	201	0.5	250	5mm x 20mm	Medium Blow	80	0.35	cULus	1073
20105000021P	Littelfuse Inc.	201P	0.5	250	5mm x 20mm	Medium Blow	80	0.35	cULus	868
BK/GMC-V-500-R	Eaton - Electronics Division	GMC	0.5	250	5mm x 20mm (Axial)	Medium Blow	35	0.41	CSA, KC-MARK, UL	731

Engineering Selection Recommendations

All listed substitute parts maintain Active product status and ROHS3 compliance. Selection between Littelfuse 201 series variants (20105000001, 20105000021) and 201P series variants (20105000301P, 20105000021P) depends on design specifications and existing inventory constraints. The Littelfuse parts share identical electrical characteristics and cULus certification.

The Eaton BK/GMC-V-500-R is a manufacturer-recommended cross-reference with equivalent electrical performance (500 mA, 250 V AC, medium blow response) but operates under different regulatory approvals (CSA, KC-MARK, UL) and exhibits lower breaking capacity (35A versus 80A) and higher melting I²t (0.41 versus 0.35). This part is suitable for applications where Eaton certification is acceptable and breaking capacity requirements do not exceed 35A.

Frequently Asked Questions (FAQ)

Q: Can 20105000001 directly replace 20105000301P?

A: Yes. Both parts are parametric equivalents with identical current rating (500 mA), voltage rating (250 V AC), fuse type (cartridge, glass), package (5mm x 20mm), response time (medium blow), breaking capacity (80A), and melting I²t (0.35). The primary difference is series designation (201 versus 201P) and inventory availability.

Q: What is the difference between the 201 and 201P series?

A: Both series share identical electrical and mechanical specifications for the 500 mA, 250 V rating. Series designation reflects internal Littelfuse product line organization. Selection between series is determined by design documentation or procurement requirements.

Q: Is the Eaton BK/GMC-V-500-R a direct substitute?

A: The Eaton part matches all critical electrical parameters (500 mA, 250 V AC, medium blow, 5mm x 20mm package) and is manufacturer-recommended. However, it differs in breaking capacity (35A versus 80A) and melting I²t (0.41 versus 0.35). Substitution is valid only if application requirements do not exceed the Eaton part's breaking capacity specification.

Q: What mounting differences exist between Littelfuse and Eaton parts?

A: Littelfuse parts require a separate fuse holder. The Eaton BK/GMC-V-500-R is specified for through-hole mounting with axial orientation. Both are mechanically compatible with standard 5mm x 20mm fuse holders and applications.

Q: Are all parts ROHS3 compliant?

A: Yes. All Littelfuse parts (20105000301P, 20105000001, 20105000021, 20105000021P) and the Eaton BK/GMC-V-500-R are ROHS3 compliant.

Q: Which part has the highest inventory availability?

A: Littelfuse 20105000001 has the highest inventory at 2956 pieces. Littelfuse 20105000021 has 1073 pieces, 20105000301P has 880 pieces, 20105000021P has 868 pieces, and Eaton BK/GMC-V-500-R has 731 pieces.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message