Littelfuse 0218.250MXE Glass Cartridge Fuse 250mA 250VAC 5x20mm Equivalent & Substitute Parts

Part Overview

The Littelfuse 0218.250MXE is a 250 mA, 250 V AC/DC slow-blow glass cartridge fuse in 5mm x 20mm axial package configuration. This part is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and ongoing production requirements. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives within the same application category.

Key Parameters

Parameter	Value
Current Rating	250 mA
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Slow Blow
Package / Case	5mm x 20mm (Axial)
Mounting Type	Through Hole
Breaking Capacity @ Rated Voltage	35A
Operating Temperature Range	-55°C ~ 125°C

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following parameters: current rating (250 mA), voltage rating (250 V AC), fuse type (cartridge glass), response time (slow blow), package dimensions (5mm x 20mm axial), and mounting type (through hole). All identified substitutes meet these core electrical and mechanical requirements. Variations in breaking capacity, melting I²t, DC cold resistance, and approval agencies are documented but do not disqualify substitution within the same application envelope. Parts are categorized as parametric equivalents (Littelfuse series variants) and manufacturer-recommended alternatives (SCHURTER and Eaton products).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Series	Current Rating (A)	Voltage Rating (V AC)	Response Time	Package	Breaking Capacity (A)	Melting I²t	Product Status	RoHS Status
0218.250MXE	Littelfuse Inc.	218	0.250	250	Slow Blow	5mm x 20mm	35	0.555	Obsolete	RoHS non-compliant
0213.250MXEP	Littelfuse Inc.	213	0.250	250	Slow Blow	5mm x 20mm	35	0.555	Active	ROHS3 Compliant
0218.250MXEP	Littelfuse Inc.	218	0.250	250	Slow Blow	5mm x 20mm	35	0.5405	Active	ROHS3 Compliant
0219.250MXAEP	Littelfuse Inc.	219XA	0.250	250	Slow Blow	5mm x 20mm	150	0.54	Active	ROHS3 Compliant
0034.3111.PT	SCHURTER Inc.	FST 5x20	0.250	250	Slow Blow	5mm x 20mm	35	0.238	Active	ROHS3 Compliant
BK/GDC-V-250MA	Eaton - Electronics Division	GDC	0.250	250	Slow Blow	5mm x 20mm	35	0.265	Active	RoHS Compliant
BK/GMD-V-250-R	Eaton - Electronics Division	GMD	0.250	250	Slow Blow	5mm x 20mm	35	0.4	Active	ROHS3 Compliant
BK/S506-V-250-R	Eaton - Electronics Division	S506	0.250	250	Slow Blow	5mm x 20mm	35	0.265	Active	ROHS3 Compliant

Engineering Selection Recommendations

For new designs and production transitions, the Littelfuse 0213.250MXEP and 0218.250MXEP are direct active-status replacements with ROHS3 compliance. The Littelfuse 0219.250MXAEP offers enhanced breaking capacity (150A versus 35A) while maintaining all core electrical parameters and active product status with ROHS3 compliance.

The SCHURTER 0034.3111.PT (FST 5x20 series) is an active alternative with cURus certification and ROHS3 compliance. The Eaton BK/S506-V-250-R provides broad international certification coverage (BSI, CCC, CSA, IMQ, SEMKO, UR, VDE) with ROHS3 compliance and active product status. The Eaton BK/GDC-V-250MA and BK/GMD-V-250-R are additional active alternatives with established certifications.

Selection should prioritize active product status and compliance requirements specific to the target application and regulatory jurisdiction.

Frequently Asked Questions (FAQ)

Q: Can the Littelfuse 0219.250MXAEP be used as a direct replacement for the 0218.250MXE?

A: Yes. The 0219.250MXAEP maintains identical current rating (250 mA), voltage rating (250 V AC), response time (slow blow), and package dimensions (5mm x 20mm). The increased breaking capacity (150A versus 35A) does not prevent substitution and may provide additional margin in applications subject to transient surge conditions.

Q: What is the significance of the melting I²t parameter in fuse selection?

A: Melting I²t defines the thermal energy required to melt the fuse element. Variations in this parameter (ranging from 0.238 to 0.555 across the substitute list) reflect differences in element composition and geometry. All listed parts maintain the same current rating and response time classification, confirming functional equivalence within the specified application envelope.

Q: Are there dimensional differences between substitute parts?

A: The primary package specification is 5mm x 20mm (axial). Minor variations exist in actual measured dimensions (e.g., SCHURTER 0034.3111.PT measures 0.213" diameter versus 0.228" for Littelfuse, and Eaton parts measure 0.218" diameter). These variations remain within mechanical tolerance for standard 5x20mm fuse holders and do not affect interchangeability.

Q: Which substitute offers the broadest international certification coverage?

A: The Eaton BK/S506-V-250-R carries certifications from BSI, CCC, CSA, IMQ, SEMKO, UR, and VDE, providing coverage across North American, European, and international regulatory frameworks.

Q: Is RoHS compliance a requirement for all substitutes?

A: All active substitute parts listed carry RoHS3 compliance. The original 0218.250MXE is RoHS non-compliant, reflecting its obsolete status. New designs should specify RoHS3-compliant alternatives.

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