Littelfuse 0218004.MXEP Glass Cartridge Fuse 4A 250VAC 5x20mm Equivalent & Substitute Parts

Part Overview

The Littelfuse 0218004.MXEP is a 4 A, 250 V AC/DC slow-blow glass cartridge fuse with through-hole mounting in a 5mm x 20mm axial package. This component is classified as Active product status and is designed for circuit protection applications requiring reliable overcurrent interruption. Equivalent and substitute parts are identified when component availability is limited, supply chain disruptions occur, or design flexibility permits selection from qualified alternatives meeting identical electrical and mechanical specifications.

Key Parameters

Parameter	Value
Current Rating	4 A
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Slow Blow
Package / Case	5mm x 20mm (Axial)
Mounting Type	Through Hole
Operating Temperature Range	-55°C ~ 125°C
Breaking Capacity @ Rated Voltage	40 A (main part)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following critical parameters:

Current Rating: 4 A (exact match required)
Voltage Rating (AC): 250 V (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Response Time: Slow Blow (exact match required)
Package / Case: 5mm x 20mm (Axial) (exact match required)
Mounting Type: Through Hole (exact match required)
Operating Temperature Range: -55°C ~ 125°C (exact match required)

All substitute parts listed meet these mandatory criteria. Variations in secondary parameters such as Breaking Capacity, Melting I²t, DC Cold Resistance, and dimensional tolerances do not disqualify substitution when primary electrical and mechanical specifications align.

Parameter Comparison

Parameter	0218004.MXEP (Littelfuse 218)	0213004.MXEP (Littelfuse 213)	0219004.MXAEP (Littelfuse 219XA)	0034.3123.PT (SCHURTER FST 5x20)	5STP 4-R (Bel Fuse 5STP)
Manufacturer	Littelfuse Inc.	Littelfuse Inc.	Littelfuse Inc.	SCHURTER Inc.	Bel Fuse Inc.
Current Rating (Amps)	4 A	4 A	4 A	4 A	4 A
Voltage Rating - AC	250 V	250 V	250 V	250 V	250 V
Fuse Type	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass
Response Time	Slow Blow	Slow Blow	Slow Blow	Slow Blow	Slow Blow
Package / Case	5mm x 20mm (Axial)	5mm x 20mm (Axial)	5mm x 20mm (Axial)	5mm x 20mm (Axial)	5mm x 20mm (Axial)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Breaking Capacity @ Rated Voltage	40 A	40 A	150 A	40 A	40 A
Melting I²t	69.1	226.505	330	68.3	56
DC Cold Resistance (Ohms)	0.0129	0.017	0.0158	Not Provided	0.014
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active	Active

Engineering Selection Recommendations

All listed substitute parts maintain Active product status and ROHS3 compliance, ensuring long-term availability and regulatory alignment. Selection among equivalents should be based on:

Approval Agency certifications required by the application (CCC, CE, CSA, UL, VDE, cURus, etc.)
Inventory availability and lead time requirements
DC Cold Resistance specifications if circuit design includes resistance-sensitive applications
Breaking Capacity requirements; the 0219004.MXAEP variant provides 150 A breaking capacity versus 40 A for other options

The Littelfuse 0213004.MXEP offers the highest inventory level (18,200 pcs) among substitutes. The SCHURTER 0034.3123.PT and Bel Fuse 5STP 4-R provide cross-manufacturer alternatives with equivalent electrical performance.

Frequently Asked Questions (FAQ)

Q: Can the 0213004.MXEP replace the 0218004.MXEP in all applications?

A: Yes. Both parts are 4 A, 250 V AC/DC slow-blow glass cartridge fuses in 5mm x 20mm axial packages with identical mounting and operating temperature specifications. The primary difference is Melting I²t (226.505 vs. 69.1), which reflects thermal response characteristics but does not prevent direct substitution when electrical ratings match.

Q: What is the significance of the higher Breaking Capacity in the 0219004.MXAEP?

A: The 0219004.MXAEP provides 150 A breaking capacity compared to 40 A in other variants. This indicates enhanced fault current interruption capability. Selection should align with the maximum prospective short-circuit current in the application circuit.

Q: Are dimensional variations between manufacturers significant?

A: The SCHURTER 0034.3123.PT has a slightly smaller diameter (5.40mm vs. 5.80mm) and the Bel Fuse 5STP 4-R has a shorter length (21.00mm vs. 22.50mm). These tolerances remain within the 5mm x 20mm package classification and are compatible with standard fuse holders designed for this form factor.

Q: Which substitute offers the best compliance coverage?

A: The Bel Fuse 5STP 4-R carries the broadest approval agency list (CCC, CE, CSA, cURus, IMQ, SEMKO, VDE), making it suitable for applications requiring multiple regional certifications.

Q: Does Moisture Sensitivity Level (MSL) affect substitution?

A: The 0219004.MXAEP is rated MSL 1 (Unlimited), while other parts are Not Applicable. This does not prevent substitution; it indicates the 0219004.MXAEP requires standard moisture control during storage and handling.

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