Littelfuse 0217.250H Glass Cartridge Fuse 250mA 250VAC 5x20mm Equivalent & Substitute Parts

Part Overview

The Littelfuse 0217.250H is a 250mA, 250VAC fast-blow glass cartridge fuse in 5x20mm form factor, designed for AC/DC applications requiring holder-mounted protection. This part is classified as obsolete, necessitating identification of active equivalent alternatives that maintain identical electrical and mechanical specifications for direct circuit board replacement without design modification.

Key Parameters

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

Substitute Part Grouping Explanation

Substitution validity is determined by strict equivalence across the following critical parameters: current rating (250mA), voltage rating (250VAC), fuse type (cartridge glass), response time (fast blow), physical dimensions (5x20mm), and breaking capacity (35A). All substitute parts listed maintain these core electrical and mechanical specifications, ensuring functional interchangeability in holder-mounted applications.

The primary distinction among substitutes involves product status (active vs. obsolete), RoHS compliance level, melting I²t characteristics, and DC cold resistance values. Parts are grouped into two categories: Littelfuse Series 217 and 235 variants (parametric equivalents from the original manufacturer), and cross-manufacturer alternatives (SCHURTER and Eaton).

Parameter Comparison

Part Number	Manufacturer	Series	Current Rating	Voltage Rating (AC)	Melting I²t	DC Cold Resistance (Ohms)	Product Status	RoHS Status
0217.250H	Littelfuse Inc.	217	250 mA	250 V	0.042	1.233	Obsolete	RoHS non-compliant
0217.250HXP	Littelfuse Inc.	217	250 mA	250 V	0.04	1.2325	Active	ROHS3 Compliant
0217.250MXBP	Littelfuse Inc.	217	250 mA	250 V	0.04	1.2325	Active	ROHS3 Compliant
0217.250MXP	Littelfuse Inc.	217	250 mA	250 V	0.04	1.2325	Active	ROHS3 Compliant
0217.250TXP	Littelfuse Inc.	217	250 mA	250 V	0.04	1.2325	Active	ROHS3 Compliant
0217.250VXP	Littelfuse Inc.	217	250 mA	250 V	0.04	1.2325	Active	ROHS3 Compliant
0235.250HXP	Littelfuse Inc.	235	250 mA	250 V	0.0166	2.25	Active	ROHS3 Compliant
0235.250MXP	Littelfuse Inc.	235	250 mA	250 V	0.0166	2.25	Active	ROHS3 Compliant
0235.250VXP	Littelfuse Inc.	235	250 mA	250 V	0.0166	2.25	Active	ROHS3 Compliant
0034.1510	SCHURTER Inc.	FSF 5x20	250 mA	250 V	0.0159	Not specified	Active	ROHS3 Compliant
BK/GDB-250MA	Eaton - Electronics Division	GDB	250 mA	250 V	0.28	4.3	Active	RoHS Compliant

Engineering Selection Recommendations

For direct replacement of the obsolete 0217.250H, the Littelfuse Series 217 variants (0217.250HXP, 0217.250MXBP, 0217.250MXP, 0217.250TXP, 0217.250VXP) are the primary selection. These parts maintain identical electrical characteristics, melting I²t values within 0.04 specification, and DC cold resistance within 1.2325 Ohms. All Series 217 alternatives carry active product status and ROHS3 compliance, with full approval agency certifications (CCC, CE, CSA, K-MARK, SEMKO, UL, VDE).

Littelfuse Series 235 variants (0235.250HXP, 0235.250MXP, 0235.250VXP) provide functional equivalence with reduced melting I²t (0.0166) and elevated DC cold resistance (2.25 Ohms), suitable for applications where slower response characteristics are acceptable. Series 235 certifications are limited to CE, CSA, KC, and UL.

Cross-manufacturer alternatives include SCHURTER 0034.1510 (FSF 5x20 series) with melting I²t of 0.0159 and Eaton BK/GDB-250MA with melting I²t of 0.28. The Eaton part exhibits significantly higher DC cold resistance (4.3 Ohms) and should be evaluated for thermal impact in low-impedance circuits.

Frequently Asked Questions (FAQ)

Q: Can Series 217 and Series 235 Littelfuse fuses be used interchangeably?

A: Both series maintain identical current rating (250mA), voltage rating (250VAC), fuse type (cartridge glass), response time (fast blow), and physical dimensions (5x20mm). However, Series 235 exhibits lower melting I²t (0.0166 vs. 0.04) and higher DC cold resistance (2.25 vs. 1.2325 Ohms). Substitution is electrically valid but may alter circuit thermal characteristics and response timing in edge-case scenarios.

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

A: Melting I²t represents the thermal energy required to melt the fuse element. Lower values indicate faster response to overcurrent conditions. Series 217 parts (I²t = 0.04) respond faster than Series 235 parts (I²t = 0.0166). The Eaton BK/GDB-250MA (I²t = 0.28) is significantly slower and should only be substituted if circuit design explicitly permits extended response time.

Q: Are all substitute parts RoHS compliant?

A: The original 0217.250H is RoHS non-compliant. All active substitutes listed (Littelfuse Series 217 and 235, SCHURTER 0034.1510, and Eaton BK/GDB-250MA) are RoHS3 or RoHS compliant, meeting current environmental regulations.

Q: Does packaging type affect electrical performance?

A: Packaging designation (Bulk vs. standard) does not affect electrical or mechanical performance. It reflects distribution and inventory management only. All listed parts are functionally equivalent regardless of packaging classification.

Q: What approval agencies are required for my application?

A: The original 0217.250H carries CCC, CE, CSA, K-MARK, SEMKO, UL, and VDE approvals. Littelfuse Series 217 variants maintain this full certification set. Series 235 variants are limited to CE, CSA, KC, and UL. SCHURTER 0034.1510 holds CCC, cURus, and VDE certifications. Eaton BK/GDB-250MA carries UL and VDE only. Select substitutes based on your specific regulatory requirements.

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