Littelfuse 0218.050MXP Glass Cartridge Fuse 50mA 250VAC 5x20mm Equivalent & Substitute Parts

Part Overview

The Littelfuse 0218.050MXP is an active-status glass cartridge fuse rated for 50mA at 250VAC with slow-blow response characteristics. This component requires a fuse holder for installation and operates across a temperature range of -55°C to 125°C. Finding equivalent and substitute parts becomes necessary when managing inventory across multiple suppliers, addressing supply chain constraints, or standardizing component selections across product lines while maintaining identical electrical and mechanical performance.

Key Parameters

Parameter	Value
Current Rating	50 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 0218.050MXP is determined by strict equivalence across the following critical parameters: current rating (50mA), voltage rating (250VAC), fuse type (cartridge glass), response time (slow blow), physical package dimensions (5mm x 20mm), and breaking capacity (35A). All substitute parts listed maintain these specifications without deviation. Mounting type (requires holder) and operating temperature range (-55°C to 125°C) are additional compatibility factors. Parts are grouped as parametric equivalents when all electrical and mechanical specifications align identically with the main part, regardless of manufacturer or series designation.

Parameter Comparison

Parameter	0218.050MXP (Littelfuse)	0218.050HXP (Littelfuse)	0034.3104 (SCHURTER)	BK/S506-50-R (Eaton)	0034.5604.11 (SCHURTER)	TSD-50MA (OptiFuse)
Current Rating	50 mA	50 mA	50 mA	50 mA	50 mA	50 mA
Voltage Rating (AC)	250 V	250 V	250 V	250 V	250 V	250 V
Fuse Type	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass	Cartridge, Glass
Response Time	Slow Blow	Slow Blow	Slow Blow	Slow Blow	Slow Blow	Slow Blow
Package / Case	5mm x 20mm	5mm x 20mm	5mm x 20mm	5mm x 20mm	5mm x 20mm	5mm x 20mm
Breaking Capacity @ Rated Voltage	35A	35A	35A	35A	35A	35A
Mounting Type	Requires Holder	Requires Holder	Requires Holder	Requires Holder	Requires Holder	Requires Holder
Operating Temperature Range	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	Not specified	-55°C ~ 125°C	-55°C ~ 125°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All listed substitute parts maintain active product status and ROHS3 compliance. The 0218.050HXP (Littelfuse) provides direct parametric equivalence with identical specifications and approval agencies (CCC, CE, CSA, K-MARK, SEMKO, UL, VDE). The 0034.3104 (SCHURTER FST 5x20 series) and 0034.5604.11 (SCHURTER SMD-FST series) are parametric equivalents with certifications including cURus and VDE. The BK/S506-50-R (Eaton S506 series) maintains all critical electrical parameters with expanded approval agencies (BSI, CCC, CSA, IMQ, SEMKO, UR, VDE) but does not specify an operating temperature range. The TSD-50MA (OptiFuse TSD series) is a parametric equivalent with ROHS3 compliance; however, approval agency information is not provided. Selection should prioritize parts with certifications matching the application's regulatory requirements and supply chain availability.

Frequently Asked Questions (FAQ)

Q: Can the 0218.050HXP directly replace the 0218.050MXP? A: Yes. The 0218.050HXP is a parametric equivalent with identical electrical specifications (50mA, 250VAC, slow-blow response), physical dimensions (5mm x 20mm), breaking capacity (35A), and operating temperature range (-55°C to 125°C). Both are Littelfuse products with the same approval agencies.

Q: What are the key differences between Littelfuse and SCHURTER substitutes? A: The Littelfuse 0218.050MXP and 0218.050HXP share identical specifications. SCHURTER parts (0034.3104 and 0034.5604.11) maintain all critical electrical and mechanical parameters but differ in series designation (FST 5x20 and SMD-FST respectively) and approval agency coverage. SCHURTER parts do not include K-MARK or SEMKO certifications.

Q: Is the BK/S506-50-R (Eaton) suitable for all applications? A: The BK/S506-50-R meets all electrical and mechanical requirements. However, it does not specify an operating temperature range, whereas the main part and most substitutes are rated -55°C to 125°C. Verify temperature requirements for your specific application before selection.

Q: What is the significance of the 5mm x 20mm package dimension? A: This dimension specifies the physical form factor required for compatibility with standard IEC 60127 fuse holders. All listed substitutes maintain this dimension and are mechanically interchangeable when installed in the same holder.

Q: Are there approval agency differences that affect substitution? A: Yes. The 0218.050MXP carries certifications from CCC, CE, CSA, K-MARK, SEMKO, UL, and VDE. SCHURTER parts include cURus and VDE but exclude K-MARK, SEMKO, and UL. The Eaton BK/S506-50-R includes BSI, IMQ, and UR certifications. Select substitutes based on certifications required by your application's regulatory framework.

Q: Can OptiFuse TSD-50MA be used as a direct substitute? A: The TSD-50MA is a parametric equivalent with identical electrical specifications and physical dimensions. However, approval agency information is not provided. Confirm that OptiFuse certifications meet your application requirements before implementation.

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