Littelfuse 0218.800MXP Equivalent & Substitute Parts

Part Overview

The Littelfuse 0218.800MXP is an 800 mA, 250 V AC/DC slow-blow glass cartridge fuse in a 5mm x 20mm package. This fuse requires a holder for installation and is designed for general-purpose circuit protection applications. The part maintains active product status with 6600 units in stock. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and application-specific requirements where alternative electrical or mechanical characteristics may be beneficial.

Key Parameters

Parameter	Value
Current Rating	800 mA
Voltage Rating (AC)	250 V
Voltage Rating (DC)	Not specified
Response Time	Slow Blow
Package / Case	5mm x 20mm
Fuse Type	Cartridge, Glass
Mounting Type	Requires Holder
Breaking Capacity @ Rated Voltage	35A
Operating Temperature Range	-55°C to 125°C
DC Cold Resistance	0.0813 Ohms
Melting I²t	3.37
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility is determined by matching the following critical parameters: current rating (800 mA), AC voltage rating (250 V), response time (slow blow), package dimensions (5mm x 20mm), fuse type (cartridge glass), and mounting requirement (requires holder). Parts are grouped into three categories based on substitution relationship type:

Parametric Equivalents (Littelfuse Series): Parts 0213.800MXP, 0218.800TXP, 0219.800MXAP, 0239.800HXP, and 0239.800MXP share identical electrical ratings and package specifications with the main part. These differ in melting I²t characteristics, breaking capacity, approval agencies, and DC cold resistance values.

Direct Equivalents (Alternative Manufacturers): Parts 0034.3116 (SCHURTER), 5ST 800-R (Bel Fuse), BK/S506-800-R (Eaton), and 0034.5616.11 (SCHURTER) meet all primary electrical and mechanical specifications across different manufacturers.

Manufacturer Recommended Alternative: Part 0034.2515 (SCHURTER) provides a medium-blow response variant with different voltage and temperature specifications, suitable for applications requiring modified response characteristics.

Parameter Comparison

Part Number	Manufacturer	Series	Current Rating	Voltage AC	Response Time	Package	Breaking Capacity	Melting I²t	DC Cold Resistance	Approval Agencies
0218.800MXP	Littelfuse	218	800 mA	250 V	Slow Blow	5x20mm	35A	3.37	0.0813 Ω	CCC, CE, CSA, K-MARK, SEMKO, UL, VDE
0213.800MXP	Littelfuse	213	800 mA	250 V	Slow Blow	5x20mm	35A	9.42	0.1635 Ω	BSI, CCC, CE, CSA, SEMKO, UR, VDE
0218.800TXP	Littelfuse	218	800 mA	250 V	Slow Blow	5x20mm	35A	3.37	0.0813 Ω	CCC, CE, CSA, KC, SEMKO, UL, VDE
0219.800MXAP	Littelfuse	219XA	800 mA	250 V	Slow Blow	5x20mm	150A	9.35	0.1635 Ω	CCC, CE, CSA, SEMKO, UL, VDE
0239.800HXP	Littelfuse	239	800 mA	250 V	Slow Blow	5x20mm	35A	7.565	0.4155 Ω	CE, CSA, KC, UL
0239.800MXP	Littelfuse	239	800 mA	250 V	Slow Blow	5x20mm	35A	7.565	0.4155 Ω	CE, CSA, KC, UL
0034.3116	SCHURTER	FST 5x20	800 mA	250 V	Slow Blow	5x20mm	35A	3.85	Not specified	CCC, cURus, VDE
5ST 800-R	Bel Fuse	5ST	800 mA	250 V	Slow Blow	5x20mm	35A	1.6	0.15 Ω	CCC, CE, CSA, cURus, IMQ, SEMKO, VDE
BK/S506-800-R	Eaton	S506	800 mA	250 V	Slow Blow	5x20mm	35A	2.78	0.129 Ω	BSI, CCC, CSA, cULus, IMQ, SEMKO, VDE
0034.5616.11	SCHURTER	SMD-FST	800 mA	250 V	Slow Blow	5x20mm	35A	3.85	Not specified	cURus, VDE
0034.2515	SCHURTER	FSM 5x20	800 mA	250 V	Medium Blow	5x20mm	80A	1.68	Not specified	Not specified

Engineering Selection Recommendations

Littelfuse Parametric Equivalents (0213.800MXP, 0218.800TXP, 0219.800MXAP, 0239.800HXP, 0239.800MXP): These parts maintain full compatibility with the 0218.800MXP in terms of current rating, voltage, package, and response time. Selection among these variants depends on application-specific requirements for melting I²t and breaking capacity. The 0219.800MXAP offers elevated breaking capacity (150A) compared to the standard 35A rating. All Littelfuse variants carry ROHS3 compliance and active product status.

SCHURTER Direct Equivalents (0034.3116, 0034.5616.11): Both SCHURTER parts meet the primary electrical and mechanical specifications. The 0034.3116 (FST 5x20 series) and 0034.5616.11 (SMD-FST series) are functionally interchangeable with the main part. Approval agency coverage differs, with 0034.3116 supporting CCC, cURus, and VDE certifications.

Bel Fuse 5ST 800-R: This part provides full electrical and mechanical compatibility with a melting I²t of 1.6, the lowest among all listed substitutes. It carries comprehensive approval agency coverage including CCC, CE, CSA, cURus, IMQ, SEMKO, and VDE.

Eaton BK/S506-800-R: The Eaton part maintains electrical and mechanical equivalence with a melting I²t of 2.78 and breaking capacity of 35A. It includes BSI, CCC, CSA, cULus, IMQ, SEMKO, and VDE certifications.

SCHURTER 0034.2515 (Manufacturer Recommended): This part differs in response time (medium blow) and includes a 125 V DC rating. It is suitable for applications requiring modified thermal response characteristics and dual AC/DC voltage specifications.

Frequently Asked Questions (FAQ)

Q: Can I substitute the 0218.800MXP with any of the listed parts?

A: Direct substitution is supported for all parts sharing identical current rating (800 mA), AC voltage (250 V), response time (slow blow), and package dimensions (5x20mm). The Littelfuse parametric equivalents, SCHURTER 0034.3116, Bel Fuse 5ST 800-R, and Eaton BK/S506-800-R meet these criteria. The SCHURTER 0034.2515 is not a direct substitute due to its medium-blow response time and different voltage specifications.

Q: What is the significance of melting I²t values in the comparison table?

A: Melting I²t represents the thermal energy required to melt the fuse element. The 0218.800MXP has a melting I²t of 3.37. Substitutes with different I²t values (such as 0213.800MXP at 9.42 or 5ST 800-R at 1.6) will exhibit different thermal response characteristics. Selection should align with circuit protection requirements.

Q: Are all substitute parts ROHS3 compliant?

A: All listed substitute parts carry ROHS3 compliance status, matching the main part specification.

Q: What approval agencies are most critical for my application?

A: The main part 0218.800MXP carries CCC, CE, CSA, K-MARK, SEMKO, UL, and VDE certifications. Substitute selection should prioritize parts with overlapping agency approvals relevant to your target market and application requirements.

Q: Does package dimension vary among substitutes?

A: All substitute parts maintain the 5mm x 20mm package specification. The 5ST 800-R has a nominal diameter of 5.10mm compared to 5.20mm for other parts, representing a negligible dimensional variance within standard tolerance ranges.

Q: Can I use the SCHURTER 0034.2515 as a direct replacement?

A: The 0034.2515 is not a direct replacement. It features medium-blow response time (versus slow-blow) and includes a 125 V DC rating not present in the main part. Use this part only when application requirements specifically call for modified response characteristics and dual AC/DC voltage support.

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