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

Part Overview

The Littelfuse 0217.050MXP is an active-status glass cartridge fuse rated for 50mA at 250VAC, housed in a 5mm x 20mm form factor. This fast-blow fuse requires a compatible holder for installation and is designed for circuit protection in AC and DC applications. Equivalent and substitute parts are identified based on matching electrical ratings, mechanical dimensions, and performance characteristics to ensure direct functional replacement in existing designs.

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
Operating Temperature Range	-55°C to 125°C
Mounting Type	Requires Holder
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the 0217.050MXP are qualified based on the following critical parameters:

Current Rating: 50 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: Fast Blow (exact match required)
Breaking Capacity: 35A (exact match required)

All identified substitutes meet these core electrical and mechanical specifications. Variations in secondary parameters such as melting I²t, DC cold resistance, and specific approval agencies do not affect functional interchangeability within the defined electrical envelope.

Parameter Comparison

Parameter	0217.050MXP (Littelfuse)	0217.050HXP (Littelfuse)	0034.1529 (SCHURTER)	BK/S500-50-R (Eaton)
Current Rating	50 mA	50 mA	50 mA	50 mA
Voltage Rating (AC)	250 V	250 V	250 V	250 V
Fuse Type	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass
Response Time	Fast Blow	Fast Blow	Fast Blow	Fast Blow
Package / Case	5mm x 20mm	5mm x 20mm	5mm x 20mm	5mm x 20mm
Breaking Capacity @ Rated Voltage	35A	35A	35A	35A
Operating Temperature Range	-55°C to 125°C	-55°C to 125°C	-55°C to 125°C	Not specified
Melting I²t	0.00019	0.00019	0.00025	0.0002
DC Cold Resistance	15.2 Ohms	15.2 Ohms	Not specified	17 Ohms
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS Compliant
Product Status	Active	Active	Active	Active

Engineering Selection Recommendations

All four parts—0217.050MXP, 0217.050HXP, 0034.1529, and BK/S500-50-R—are active-status products suitable for direct substitution based on matching electrical and mechanical specifications.

Littelfuse 0217.050MXP and 0217.050HXP: Both are Littelfuse Series 217 fuses with identical electrical ratings and identical melting I²t values (0.00019). These parts are parametrically equivalent and interchangeable. Both carry comprehensive approval certifications including CCC, CE, CSA, K-MARK, SEMKO, UL, and VDE.

SCHURTER 0034.1529: This Series FSF 5x20 fuse meets all core electrical and mechanical requirements. It carries CCC, cURus, and VDE certifications. The melting I²t value (0.00025) is slightly higher than the Littelfuse parts but remains within acceptable substitution parameters for the 50mA 250VAC rating.

Eaton BK/S500-50-R: This Series S500 fuse meets all core electrical and mechanical requirements. The melting I²t value (0.0002) falls between the Littelfuse and SCHURTER values. DC cold resistance is specified at 17 Ohms compared to 15.2 Ohms for the Littelfuse parts. Operating temperature range is not specified for this part.

Selection among these substitutes should be based on availability, lead time, and specific approval agency requirements for the end application.

Frequently Asked Questions (FAQ)

Q: Can 0217.050HXP directly replace 0217.050MXP?

A: Yes. Both are Littelfuse Series 217 fuses with identical current rating (50mA), voltage rating (250VAC), package dimensions (5mm x 20mm), response time (fast blow), and melting I²t (0.00019). They are parametrically equivalent.

Q: What is the difference between the SCHURTER 0034.1529 and Littelfuse 0217.050MXP?

A: Both fuses share identical electrical ratings (50mA, 250VAC) and mechanical dimensions (5mm x 20mm). The primary difference is the melting I²t value: SCHURTER specifies 0.00025 versus Littelfuse 0.00019. This variation does not affect functional interchangeability within the defined 50mA fast-blow envelope. Approval certifications differ slightly; SCHURTER carries CCC, cURus, and VDE certifications.

Q: Is the Eaton BK/S500-50-R compatible with existing 5mm x 20mm fuse holders?

A: Yes. The Eaton BK/S500-50-R is housed in the standard 5mm x 20mm cartridge form factor and is mechanically compatible with all standard 5mm x 20mm fuse holders. Electrical ratings match the 0217.050MXP specification.

Q: Do all substitute parts have the same RoHS compliance status?

A: All four parts are RoHS compliant. Littelfuse 0217.050MXP and 0217.050HXP are ROHS3 compliant. SCHURTER 0034.1529 is ROHS3 compliant. Eaton BK/S500-50-R is RoHS compliant.

Q: What approval agencies are common across all substitute parts?

A: All four parts carry VDE certification. Littelfuse parts (0217.050MXP and 0217.050HXP) and SCHURTER 0034.1529 all carry CCC certification. For applications requiring specific approval agencies, consult the individual part certifications listed in the parameter comparison table.

Q: Can these fuses be used interchangeably in AC and DC circuits?

A: Yes. All four parts are rated for both AC and DC operation at 250V. The 50mA current rating and fast-blow response time apply to both AC and DC applications within the specified voltage envelope.

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