Littelfuse 0618.500MXP Glass Cartridge Fuse Equivalent & Substitute Parts

Part Overview

The Littelfuse 0618.500MXP is a 500 mA, 250 V AC/DC glass cartridge fuse in 5mm x 20mm form factor with slow-blow response characteristics. This fuse is designed for circuit protection in applications requiring a holder-mounted cartridge configuration. The part is active in production and widely stocked. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, and functional performance parameters to ensure direct interchangeability in circuit protection applications.

Key Parameters

Parameter	Value
Current Rating	500 mA
Voltage Rating (AC)	250 V
Package / Case	5mm x 20mm
Fuse Type	Cartridge, Glass
Response Time	Slow Blow
Mounting Type	Requires Holder
Operating Temperature Range	-55°C to 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

Current Rating: 500 mA (exact match required)
Voltage Rating: 250 V AC (exact match required)
Package Dimensions: 5mm x 20mm (exact match required)
Fuse Type: Cartridge, Glass (exact match required)
Response Time: Slow Blow (exact match required)
Mounting Configuration: Requires Holder (exact match required)

All identified substitute parts meet these core electrical and mechanical requirements. Variations in Breaking Capacity, Melting I²t, DC Cold Resistance, and approval agency certifications do not prevent substitution when the above parameters are identical. Parts are grouped by manufacturer and series designation.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Series	Current Rating	Voltage Rating (AC)	Package	Response Time	Breaking Capacity @ Rated Voltage	Melting I²t	DC Cold Resistance (Ohms)	Inventory (Pcs)
0618.500MXP	Littelfuse Inc.	618	500 mA	250 V	5mm x 20mm	Slow Blow	35 A	2.825	0.37	16300
0214.600MXP	Littelfuse Inc.	213	500 mA	250 V	5mm x 20mm	Slow Blow	35 A	2.905	0.37	2100
0218.500HXP	Littelfuse Inc.	218	500 mA	250 V	5mm x 20mm	Slow Blow	35 A	2.825	0.37	4644
0218.500MXP	Littelfuse Inc.	218	500 mA	250 V	5mm x 20mm	Slow Blow	35 A	2.825	0.37	15465
0218.500TXP	Littelfuse Inc.	218	500 mA	250 V	5mm x 20mm	Slow Blow	35 A	2.825	0.37	880
0219.500MXAP	Littelfuse Inc.	219XA	500 mA	250 V	5mm x 20mm	Slow Blow	150 A	3	0.37	1056
0239.500HXP	Littelfuse Inc.	239	500 mA	250 V	5mm x 20mm	Slow Blow	35 A	1.985	0.909	1485
0239.500MXP	Littelfuse Inc.	239	500 mA	250 V	5mm x 20mm	Slow Blow	35 A	1.985	0.909	2300
0034.3114	SCHURTER Inc.	FST 5x20	500 mA	250 V	5mm x 20mm	Slow Blow	35 A	3	Not specified	12470
0034.5614.11	SCHURTER Inc.	SMD-FST	500 mA	250 V	5mm x 20mm	Slow Blow	35 A	3	Not specified	1819
TSC-500MA	OptiFuse	TSC	500 mA	250 V	5mm x 20mm	Slow Blow	100 A	1.9567	Not specified	4180

Engineering Selection Recommendations

All substitute parts listed maintain identical electrical ratings (500 mA, 250 V AC) and mechanical form factor (5mm x 20mm) with slow-blow response characteristics. Selection among substitutes should be based on:

Littelfuse Series 218 (0218.500HXP, 0218.500MXP, 0218.500TXP): These parts offer the highest inventory availability and maintain identical Melting I²t and DC Cold Resistance values to the main part. All carry comprehensive international certifications including CCC, CE, CSA, UL, and VDE.

Littelfuse Series 213 (0214.600MXP): Functionally equivalent with marginally higher Melting I²t (2.905 vs. 2.825). Carries BSI, SEMKO, and SEMKO certifications in addition to standard approvals.

Littelfuse Series 219XA (0219.500MXAP): Offers elevated Breaking Capacity (150 A vs. 35 A) while maintaining all core electrical parameters. Suitable for applications requiring higher fault current withstand capability.

Littelfuse Series 239 (0239.500HXP, 0239.500MXP): Feature lower Melting I²t (1.985) and higher DC Cold Resistance (0.909 Ohms). Certifications limited to CE, CSA, KC, and UL. Appropriate for applications with tighter thermal constraints.

SCHURTER FST 5x20 (0034.3114, 0034.5614.11): Cross-manufacturer alternatives with identical core parameters. SCHURTER parts carry cURus and VDE certifications. Series 0034.5614.11 is designated SMD-FST variant.

OptiFuse TSC-500MA: Alternative manufacturer option with 100 A Breaking Capacity and lower Melting I²t (1.9567). Carries cULus and UL 248 certifications.

Frequently Asked Questions (FAQ)

Q: Can I substitute any of these parts for the 0618.500MXP in my application?

A: Yes, all listed parts are electrically and mechanically equivalent. They share identical current rating (500 mA), voltage rating (250 V AC), package dimensions (5mm x 20mm), and response time (slow blow). Direct substitution is supported without circuit modification.

Q: What is the difference between the Littelfuse 218 series variants (0218.500HXP, 0218.500MXP, 0218.500TXP)?

A: All three maintain identical electrical and mechanical specifications. Differences are limited to packaging designation (HXP, MXP, TXP) and approval agency certifications. The 0218.500MXP offers the highest inventory level (15465 pcs).

Q: Why do some parts have different Melting I²t values?

A: Melting I²t variation reflects differences in internal fuse element design while maintaining the same current rating and response time. These variations do not prevent substitution when all core electrical parameters match.

Q: What is the significance of Breaking Capacity differences?

A: Breaking Capacity indicates the maximum fault current the fuse can safely interrupt. The 0219.500MXAP (150 A) provides higher fault current withstand compared to standard 35 A variants. Selection depends on the maximum prospective fault current in your circuit.

Q: Are SCHURTER and OptiFuse parts fully compatible with Littelfuse parts?

A: Yes. SCHURTER 0034.3114 and 0034.5614.11, along with OptiFuse TSC-500MA, meet all core electrical and mechanical requirements for direct substitution. Verify approval agency certifications match your application requirements.

Q: Does DC Cold Resistance variation affect substitution?

A: DC Cold Resistance differences (0.37 Ohms vs. 0.909 Ohms in Series 239) do not prevent substitution. Selection should account for circuit design if resistance-sensitive applications are involved.

Q: Which part should I select for maximum inventory availability?

A: The 0618.500MXP (16300 pcs) and 0218.500MXP (15465 pcs) offer the highest stock levels. SCHURTER 0034.3114 (12470 pcs) provides a strong alternative from a different manufacturer.

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