Littelfuse 0218.500MXP Equivalent & Substitute Parts

Part Overview

The Littelfuse 0218.500MXP is a 500 mA, 250 V AC/DC slow-blow glass cartridge fuse in 5mm x 20mm form factor. This fuse requires a holder for installation and is designed for circuit protection in industrial and commercial applications. The part is active in production with 15,465 units in stock. Alternative equivalent parts may be required due to supply constraints, regional certification requirements, or specific application compatibility needs.

Key Parameters

Parameter	Value
Current Rating	500 mA
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Slow Blow
Package / Case	5mm x 20mm
Breaking Capacity @ Rated Voltage	35A
Mounting Type	Requires Holder
Operating Temperature Range	-55°C ~ 125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the 0218.500MXP is determined by the following mandatory parameters:

Primary Criteria (Must Match Exactly):

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

Secondary Criteria (Allowable Variation):

Breaking Capacity @ Rated Voltage: 35A or higher
Melting I²t: Within acceptable range for slow-blow characteristics
DC Cold Resistance: Minor variations acceptable
Operating Temperature: -55°C ~ 125°C or equivalent
Approval Agencies: Must include relevant regional certifications

Parts are grouped into three categories:

Parametric Equivalents (Littelfuse Series): 0214.600MXP, 0218.500HXP, 0218.500TXP, 0219.500MXAP, 0239.500HXP, 0239.500MXP, 0618.500MXP. These maintain identical electrical specifications with variations in series designation, breaking capacity, or melting I²t characteristics.

Direct Equivalents (Cross-Manufacturer): 0034.3114 (SCHURTER), 5ST 500-R (Bel Fuse), BK/S506-500-R (Eaton). These are functionally equivalent parts from alternative manufacturers meeting the same electrical and mechanical requirements.

Parameter Comparison

Part Number	Manufacturer	Series	Current Rating	Voltage (AC)	Breaking Capacity	Melting I²t	DC Cold Resistance (Ω)	Inventory
0218.500MXP	Littelfuse	218	500 mA	250 V	35A	2.825	0.37	15,465
0214.600MXP	Littelfuse	213	500 mA	250 V	35A	2.905	0.37	2,100
0218.500HXP	Littelfuse	218	500 mA	250 V	35A	2.825	0.37	4,644
0218.500TXP	Littelfuse	218	500 mA	250 V	35A	2.825	0.37	880
0219.500MXAP	Littelfuse	219XA	500 mA	250 V	150A	3	0.37	1,056
0239.500HXP	Littelfuse	239	500 mA	250 V	35A	1.985	0.909	1,485
0239.500MXP	Littelfuse	239	500 mA	250 V	35A	1.985	0.909	2,300
0618.500MXP	Littelfuse	618	500 mA	250 V	35A	2.825	0.37	16,300
0034.3114	SCHURTER	FST 5x20	500 mA	250 V	35A	3	—	12,470
5ST 500-R	Bel Fuse	5ST	500 mA	250 V	35A	1.4	0.54	22,671
BK/S506-500-R	Eaton	S506	500 mA	250 V	35A	0.827	0.183	1,335

Engineering Selection Recommendations

Littelfuse Series Equivalents (0214.600MXP, 0218.500HXP, 0218.500TXP, 0219.500MXAP, 0239.500HXP, 0239.500MXP, 0618.500MXP):

These parts maintain full electrical and mechanical compatibility with the 0218.500MXP. Selection among Littelfuse equivalents should be based on:

0218.500HXP and 0618.500MXP: Highest inventory availability (4,644 and 16,300 units respectively). Both maintain identical melting I²t (2.825) and DC cold resistance (0.37 Ω) as the primary part. The 0618.500MXP offers superior stock levels.
0214.600MXP: Identical electrical performance with slightly higher melting I²t (2.905). Suitable for applications requiring marginally extended response characteristics.
0218.500TXP: Same series and electrical specifications as the primary part. Lower inventory (880 units) may limit availability.
0219.500MXAP: Features elevated breaking capacity (150A vs. 35A). Select only when higher fault current withstand capability is required.
0239.500HXP and 0239.500MXP: Different melting I²t (1.985) and elevated DC cold resistance (0.909 Ω). These represent faster-acting variants and should be selected only when application requirements specifically call for reduced response time.

Cross-Manufacturer Equivalents (0034.3114, 5ST 500-R, BK/S506-500-R):

0034.3114 (SCHURTER FST 5x20): Excellent inventory (12,470 units). Melting I²t of 3 provides slightly slower response than the primary part. Certifications include CCC, cURus, and VDE. Suitable for direct substitution in applications requiring SCHURTER brand compliance.
5ST 500-R (Bel Fuse): Highest inventory availability (22,671 units). Melting I²t of 1.4 indicates faster response time compared to the 0218.500MXP (2.825). DC cold resistance of 0.54 Ω is elevated. Comprehensive certifications (CCC, CE, CSA, cURus, IMQ, SEMKO, VDE). Select when faster fuse response is acceptable and Bel Fuse brand is required.
BK/S506-500-R (Eaton S506): Lowest melting I²t (0.827) and lowest DC cold resistance (0.183 Ω), indicating fastest response time. Limited inventory (1,335 units). Comprehensive certifications including BSI, CCC, CSA, cULus, IMQ, SEMKO, VDE. Select only when application requires the fastest fuse response characteristics.

Certification Alignment:

The primary part 0218.500MXP carries certifications: CCC, CE, CSA, K-MARK, SEMKO, UL, VDE. All listed equivalents maintain CCC, CE, CSA, and VDE certifications. Verify regional certification requirements before final selection.

Frequently Asked Questions (FAQ)

Q: Can I substitute the 0218.500MXP with any of the listed parts without circuit redesign?

A: Yes, all listed parts maintain the same current rating (500 mA), voltage rating (250 V AC), fuse type (cartridge glass), response time classification (slow blow), and physical package (5mm x 20mm). Direct mechanical and electrical substitution is possible. However, verify that your application's specific response time requirements align with the melting I²t characteristics of the selected substitute.

Q: What is the difference between the Littelfuse 0218 and 0239 series?

A: Both series maintain identical current and voltage ratings. The primary difference is melting I²t: the 0218 series has 2.825, while the 0239 series has 1.985, indicating faster response. The 0239 series also exhibits higher DC cold resistance (0.909 Ω vs. 0.37 Ω). Select the 0239 series only if your application requires faster fuse response.

Q: Why does the 0219.500MXAP have a breaking capacity of 150A instead of 35A?

A: The 0219.500MXAP is designed for applications with higher fault current levels. While all other electrical parameters remain identical, the elevated breaking capacity allows this fuse to safely interrupt higher short-circuit currents. Use this part only when your circuit's maximum fault current exceeds 35A.

Q: Are there physical dimension differences between manufacturers?

A: The 5ST 500-R (Bel Fuse) has a slightly smaller diameter (5.10mm vs. 5.20mm standard). Verify holder compatibility before substitution. All other parts maintain the standard 5.20mm x 20.00mm dimensions.

Q: Which substitute offers the best inventory availability?

A: The 0618.500MXP (Littelfuse, 16,300 units) and 5ST 500-R (Bel Fuse, 22,671 units) offer the highest stock levels. Both maintain full electrical compatibility with the primary part.

Q: Do all substitutes meet the same RoHS and REACH requirements?

A: Yes, all listed parts are ROHS3 compliant and REACH unaffected, matching the primary part's environmental compliance status.

Q: What should I consider when choosing between Littelfuse and cross-manufacturer equivalents?

A: If your design specifies Littelfuse brand, select from the Littelfuse series (0213, 0218, 0219, 0239, 0618). If brand flexibility exists, cross-manufacturer parts (SCHURTER 0034.3114, Bel Fuse 5ST 500-R, Eaton BK/S506-500-R) offer comparable performance with potentially better availability. Verify that your application's regional certifications are met by the selected manufacturer.

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