Littelfuse 0218.050H Equivalent & Substitute Parts

Part Overview

The Littelfuse 0218.050H is a 50 mA, 250 V AC/DC slow-blow glass cartridge fuse in a 5mm x 20mm package format. This component is classified as obsolete, requiring identification of active equivalent alternatives for continued system support and procurement. Substitute parts must maintain identical electrical ratings, mechanical dimensions, and functional characteristics to ensure direct compatibility in existing circuit protection applications.

Key Parameters

Parameter	Value
Current Rating	50 mA
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Slow Blow
Package / Case	5mm x 20mm
Mounting Type	Requires Holder
Breaking Capacity @ Rated Voltage	35A
Operating Temperature Range	-55°C ~ 125°C
Size / Dimension	0.205" Dia x 0.787" L (5.20mm x 20.00mm)

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following parameters: current rating (50 mA), voltage rating (250 V AC), fuse type (cartridge glass), response time (slow blow), package dimensions (5mm x 20mm), and breaking capacity (35A minimum). All listed substitute parts meet these core electrical and mechanical requirements.

Littelfuse Series 218 active alternatives (0218.050HXP, 0218.050MXBP, 0218.050MXP, 0218.050TXP, 0218.050VXP) provide direct parametric equivalence with enhanced RoHS3 compliance and expanded certification coverage compared to the obsolete 0218.050H. The Littelfuse Series 219XA variant (0219.050MXAP) maintains identical electrical specifications with increased breaking capacity (150A) and represents an upgraded alternative.

Cross-manufacturer alternatives from Eaton Electronics (BK/GDC-50MA, BK/S506-50-R, BK1/S506-50-R) and SCHURTER (0034.5604.22) satisfy all core electrical parameters with equivalent mechanical compatibility. These alternatives differ in DC cold resistance and melting I²t characteristics but remain functionally interchangeable for standard circuit protection applications.

Parameter Comparison

Part Number	Manufacturer	Current Rating	Voltage Rating (AC)	Response Time	Package	Breaking Capacity	Product Status	RoHS Status
0218.050H	Littelfuse Inc.	50 mA	250 V	Slow Blow	5mm x 20mm	35A	Obsolete	RoHS non-compliant
0218.050HXP	Littelfuse Inc.	50 mA	250 V	Slow Blow	5mm x 20mm	35A	Active	ROHS3 Compliant
0218.050MXBP	Littelfuse Inc.	50 mA	250 V	Slow Blow	5mm x 20mm	35A	Active	ROHS3 Compliant
0218.050MXP	Littelfuse Inc.	50 mA	250 V	Slow Blow	5mm x 20mm	35A	Active	ROHS3 Compliant
0218.050TXP	Littelfuse Inc.	50 mA	250 V	Slow Blow	5mm x 20mm	35A	Active	ROHS3 Compliant
0218.050VXP	Littelfuse Inc.	50 mA	250 V	Slow Blow	5mm x 20mm	35A	Active	ROHS3 Compliant
0219.050MXAP	Littelfuse Inc.	50 mA	250 V	Slow Blow	5mm x 20mm	150A	Active	ROHS3 Compliant
BK/GDC-50MA	Eaton - Electronics Division	50 mA	250 V	Slow Blow	5mm x 20mm	35A	Active	RoHS Compliant
0034.5604.22	SCHURTER Inc.	50 mA	250 V	Slow Blow	5mm x 20mm	35A	Active	ROHS3 Compliant
BK/S506-50-R	Eaton - Electronics Division	50 mA	250 V	Slow Blow	5mm x 20mm	35A	Active	ROHS3 Compliant
BK1/S506-50-R	Eaton - Electronics Division	50 mA	250 V	Slow Blow	5mm x 20mm	35A	Active	ROHS3 Compliant

Engineering Selection Recommendations

For new designs and procurement, Littelfuse Series 218 active variants (0218.050HXP, 0218.050MXP) are preferred primary substitutes. Both parts maintain identical electrical specifications to the obsolete 0218.050H while offering ROHS3 compliance and comprehensive international certifications (CCC, CE, CSA, K-MARK, SEMKO, UL, VDE). The 0218.050MXP variant provides the highest inventory availability (16,110 units) for supply chain continuity.

For applications requiring enhanced breaking capacity, the Littelfuse 0219.050MXAP (Series 219XA) offers 150A breaking capacity while maintaining all other electrical parameters. This variant is suitable for circuits with higher fault current potential.

Cross-manufacturer alternatives from Eaton Electronics (BK/S506-50-R, BK1/S506-50-R) and SCHURTER (0034.5604.22) provide equivalent functionality with active product status and RoHS compliance. Selection among these alternatives depends on existing supply chain relationships and certification requirements specific to the application.

Frequently Asked Questions (FAQ)

Q: Can the 0218.050H be directly replaced with any of the listed substitutes?

A: Yes. All listed substitute parts maintain identical current rating (50 mA), voltage rating (250 V AC), fuse type (cartridge glass), response time (slow blow), and package dimensions (5mm x 20mm). Direct mechanical and electrical compatibility is confirmed for all alternatives.

Q: What is the difference between Littelfuse Series 218 variants (0218.050HXP, 0218.050MXP, 0218.050TXP, 0218.050VXP, 0218.050MXBP)?

A: All Series 218 variants share identical electrical ratings and package specifications. Differences exist in melting I²t values (ranging from 0.00692 to 0.017), DC cold resistance (21.292 to 23.3 Ohms), and certification coverage. These variations do not affect substitution eligibility for standard circuit protection applications.

Q: How does the 0219.050MXAP differ from other substitutes?

A: The 0219.050MXAP (Series 219XA) maintains all electrical parameters of the 0218.050H but provides increased breaking capacity (150A versus 35A). This upgrade is suitable for circuits with higher fault current levels while maintaining compatibility with existing fuse holders.

Q: Are there packaging differences among the substitutes?

A: Littelfuse Series 218 variants are available in bulk packaging. The SCHURTER 0034.5604.22 is supplied in Tape & Reel format. All parts maintain identical 5mm x 20mm physical dimensions and are compatible with standard fuse holders.

Q: Which substitute offers the best compliance profile?

A: Littelfuse 0218.050MXP and 0218.050HXP both provide ROHS3 compliance with comprehensive international certifications (CCC, CE, CSA, K-MARK, SEMKO, UL, VDE). Eaton Electronics variants (BK/S506-50-R, BK1/S506-50-R) offer ROHS3 compliance with expanded certification coverage (BSI, CCC, CSA, IMQ, SEMKO, UR, VDE).

Q: What inventory levels are available for the primary substitutes?

A: Littelfuse 0218.050MXP: 16,110 units; Littelfuse 0218.050HXP: 1,028 units; Eaton BK1/S506-50-R: 2,038 units; Eaton BK/S506-50-R: 1,270 units; SCHURTER 0034.5604.22: 883 units.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message