Littelfuse 0217.050H Glass Cartridge Fuse 50mA 250VAC 5x20mm Equivalent & Substitute Parts

Part Overview

The Littelfuse 0217.050H is a 50mA 250VAC glass cartridge fuse in 5x20mm form factor with fast-blow response characteristics. This part is classified as obsolete, necessitating identification of active equivalent alternatives for ongoing component sourcing and system maintenance. Substitute parts must maintain identical electrical ratings, mechanical dimensions, and functional performance to ensure direct compatibility in existing applications.

Key Parameters

Parameter	Value
Current Rating	50 mA
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Glass
Response Time	Fast Blow
Package / Case	5mm x 20mm
Breaking Capacity @ Rated Voltage	35A
Melting I²t	0.00019
Operating Temperature Range	-55°C ~ 125°C
DC Cold Resistance	15.2 Ohms
Mounting Type	Requires Holder

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict equivalence across the following critical parameters: current rating (50mA), voltage rating (250VAC), fuse type (cartridge glass), response time (fast blow), package dimensions (5x20mm), breaking capacity (35A), and melting I²t value (0.00019). All substitute parts listed maintain these specifications without deviation.

Littelfuse parametric equivalents (0217.050HXP, 0217.050MXBP, 0217.050MXP, 0217.050TXP, 0217.050VXP) are direct functional replacements with identical electrical and mechanical characteristics. These parts differ only in packaging configuration (bulk) and RoHS compliance status (ROHS3 compliant vs. non-compliant original).

Cross-manufacturer alternatives from Eaton (BK/GDB-50MA, BK/S500-50-R, BK1/S500-50-R) and SCHURTER (0034.1529.PT) maintain core electrical parameters but may exhibit minor variations in DC cold resistance and melting I²t values within acceptable engineering tolerances.

Parameter Comparison

Part Number	Manufacturer	Current Rating	Voltage Rating (AC)	Response Time	Package	Breaking Capacity	Melting I²t	DC Cold Resistance	Product Status	RoHS Status
0217.050H	Littelfuse Inc.	50 mA	250 V	Fast Blow	5x20mm	35A	0.00019	15.2 Ohms	Obsolete	RoHS non-compliant
0217.050HXP	Littelfuse Inc.	50 mA	250 V	Fast Blow	5x20mm	35A	0.00019	15.2 Ohms	Active	ROHS3 Compliant
0217.050MXBP	Littelfuse Inc.	50 mA	250 V	Fast Blow	5x20mm	35A	0.00019	15.2 Ohms	Active	ROHS3 Compliant
0217.050MXP	Littelfuse Inc.	50 mA	250 V	Fast Blow	5x20mm	35A	0.00019	15.2 Ohms	Active	ROHS3 Compliant
0217.050TXP	Littelfuse Inc.	50 mA	250 V	Fast Blow	5x20mm	35A	0.00019	15.2 Ohms	Active	ROHS3 Compliant
0217.050VXP	Littelfuse Inc.	50 mA	250 V	Fast Blow	5x20mm	35A	0.00019	15.2 Ohms	Active	ROHS3 Compliant
BK/GDB-50MA	Eaton - Electronics Division	50 mA	250 V	Fast Blow	5x20mm	35A	0.0002	17 Ohms	Active	RoHS Compliant
0034.1529.PT	SCHURTER Inc.	50 mA	250 V	Fast Blow	5x20mm (Axial)	35A	0.00025	Not specified	Active	ROHS3 Compliant
BK/S500-50-R	Eaton - Electronics Division	50 mA	250 V	Fast Blow	5x20mm	35A	0.0002	17 Ohms	Active	RoHS Compliant
BK1/S500-50-R	Eaton - Electronics Division	50 mA	250 V	Fast Blow	5x20mm	35A	0.0002	17 Ohms	Active	RoHS Compliant

Engineering Selection Recommendations

For direct replacement of the obsolete 0217.050H, Littelfuse parametric equivalents (0217.050HXP, 0217.050MXBP, 0217.050MXP, 0217.050TXP, 0217.050VXP) provide identical electrical and mechanical specifications with active product status and ROHS3 compliance. These parts are preferred for new designs and ongoing production requiring regulatory compliance.

Eaton S500 series fuses (BK/S500-50-R, BK1/S500-50-R) and GDB series (BK/GDB-50MA) are functionally equivalent alternatives with RoHS compliance. Minor variations in DC cold resistance (17 Ohms vs. 15.2 Ohms) and melting I²t (0.0002 vs. 0.00019) fall within acceptable engineering tolerances for 50mA fast-blow applications.

SCHURTER 0034.1529.PT offers compatibility with identical electrical ratings and ROHS3 compliance. This part features through-hole mounting and slightly larger physical dimensions (5.40mm x 22.50mm) compared to standard 5x20mm cartridges, requiring mechanical fit verification in existing holder assemblies.

Frequently Asked Questions (FAQ)

Q: Can Littelfuse 0217.050HXP directly replace the obsolete 0217.050H?

A: Yes. The 0217.050HXP maintains identical current rating (50mA), voltage rating (250VAC), response time (fast blow), package dimensions (5x20mm), breaking capacity (35A), and melting I²t (0.00019). The only differences are packaging configuration and ROHS3 compliance status.

Q: Are Eaton S500 series fuses compatible with Littelfuse holders?

A: Yes. Eaton BK/S500-50-R and BK1/S500-50-R maintain the standard 5x20mm cartridge form factor and are mechanically compatible with Littelfuse fuse holders. Electrical performance is equivalent within acceptable tolerances.

Q: What is the significance of the melting I²t parameter in substitution?

A: Melting I²t determines the thermal energy required to melt the fuse element and is critical for circuit protection coordination. Littelfuse parts specify 0.00019, while Eaton alternatives specify 0.0002. This minor variation (approximately 5% difference) does not affect functional compatibility in standard 50mA applications.

Q: Why does SCHURTER 0034.1529.PT have different physical dimensions?

A: The SCHURTER part is configured for through-hole mounting with axial leads (5.40mm x 22.50mm) versus the standard cartridge form factor (5.20mm x 20.00mm). Mechanical compatibility depends on the specific holder design. Verify dimensional fit before substitution.

Q: Which substitute part offers the best compliance profile?

A: All active substitute parts listed (Littelfuse 0217.050HXP/MXBP/MXP/TXP/VXP, Eaton S500 series, SCHURTER 0034.1529.PT) are RoHS compliant. Littelfuse parametric equivalents carry ROHS3 certification and are recommended for applications requiring the highest regulatory compliance standards.

Q: Can I use BK1/S500-4-R as a substitute?

A: No. BK1/S500-4-R is rated for 4A current, not 50mA. Current rating is a non-negotiable substitution parameter. Using an incorrect current rating will result in improper circuit protection.

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