Equivalent & Substitute Parts for S501-50-R Ceramic Fuse

Part Overview

The S501-50-R is a 50 mA ceramic cartridge fuse rated for 250 V AC/DC operation in a 5mm x 20mm package form factor. Manufactured by Eaton - Electronics Division, this fast-blow fuse cartridge requires a holder for installation and is classified as Active product status. Substitute parts become necessary when the primary part experiences supply constraints, extended lead times, or when design flexibility permits selection from qualified alternative manufacturers while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value
Current Rating	50 mA
Voltage Rating (AC)	250 V
Fuse Type	Cartridge, Ceramic
Response Time	Fast Blow
Package / Case	5mm x 20mm
Breaking Capacity @ Rated Voltage	1.5 kA
Mounting Type	Requires Holder

Substitute Part Grouping Explanation

Substitution eligibility for the S501-50-R is determined by strict equivalence across the following parameters: current rating (50 mA), voltage rating (250 V AC), fuse type (cartridge ceramic), response time (fast blow), package dimensions (5mm x 20mm), breaking capacity (1.5 kA), and mounting requirement (holder-based installation). All identified substitute parts meet these core electrical and mechanical criteria. Substitutes are grouped into two categories: Eaton-manufactured alternatives within the GDA series (BK/GDA-50MA and GDA-50MA) and cross-manufacturer alternatives from Littelfuse Inc. within the 216 series (0216.050HXP and 0216.050MXP). Each substitute maintains full compatibility with the original part's functional requirements and physical installation envelope.

Parameter Comparison

Parameter	S501-50-R	BK/GDA-50MA	GDA-50MA	0216.050HXP	0216.050MXP
Manufacturer	Eaton	Eaton	Eaton	Littelfuse	Littelfuse
Current Rating (mA)	50	50	50	50	50
Voltage Rating (V AC)	250	250	250	250	250
Fuse Type	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic	Cartridge, Ceramic
Response Time	Fast Blow	Fast Blow	Fast Blow	Fast Blow	Fast Blow
Package / Case	5mm x 20mm	5mm x 20mm	5mm x 20mm	5mm x 20mm	5mm x 20mm
Breaking Capacity @ Rated Voltage (kA)	1.5	1.5	1.5	1.5	1.5
Mounting Type	Requires Holder	Requires Holder	Requires Holder	Requires Holder	Requires Holder
Product Status	Active	Active	Active	Active	Active
Size / Dimension (mm)	5.20 x 20.00	5.20 x 20.00	5.20 x 20.00	5.20 x 20.00	5.20 x 20.00
Operating Temperature Range	Not specified	Not specified	Not specified	-55°C ~ 125°C	-55°C ~ 125°C
RoHS Status	ROHS3 Compliant	RoHS Compliant	Not specified	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All five parts (S501-50-R, BK/GDA-50MA, GDA-50MA, 0216.050HXP, and 0216.050MXP) are classified as Active product status and carry ROHS3 or RoHS compliance certification, confirming their suitability for current procurement and deployment. The Eaton GDA series alternatives (BK/GDA-50MA and GDA-50MA) maintain manufacturer continuity and are recommended when supply from the original S501 series is constrained. The Littelfuse 216 series alternatives (0216.050HXP and 0216.050MXP) provide cross-manufacturer equivalence with documented operating temperature range specifications (-55°C ~ 125°C) and are suitable for applications requiring extended temperature performance data. All parts carry international approval certifications including CSA, CCC, SEMKO, and UR, confirming compliance with global safety standards. Selection between Littelfuse alternatives should be based on inventory availability and specific application temperature requirements.

Frequently Asked Questions (FAQ)

Q: Can S501-50-R be directly replaced with BK/GDA-50MA or GDA-50MA?

A: Yes. Both Eaton GDA series parts are parametric equivalents with identical current rating (50 mA), voltage rating (250 V AC), fuse type (ceramic cartridge), response time (fast blow), package dimensions (5mm x 20mm), and breaking capacity (1.5 kA). Physical installation and electrical performance are fully compatible.

Q: What is the difference between 0216.050HXP and 0216.050MXP?

A: Both Littelfuse parts are parametric equivalents meeting all core electrical and mechanical specifications. The primary difference is the melting I²t value (0.00019 for both), which is lower than the S501-50-R (0.0017). Both parts operate across -55°C to 125°C and carry identical international certifications.

Q: Are there any compatibility concerns when substituting with Littelfuse parts?

A: No compatibility concerns exist for the specified electrical and mechanical parameters. Both Littelfuse alternatives (0216.050HXP and 0216.050MXP) maintain the 5mm x 20mm package form factor, require holder-based installation, and deliver the same 1.5 kA breaking capacity at 250 V. All parts are ROHS3 compliant and carry CSA, CCC, SEMKO, and UR certifications.

Q: Which substitute part should be selected for temperature-critical applications?

A: The Littelfuse 216 series parts (0216.050HXP and 0216.050MXP) provide documented operating temperature range specifications (-55°C ~ 125°C). The Eaton S501 and GDA series do not specify operating temperature limits in the provided data. For applications requiring confirmed temperature performance, Littelfuse alternatives are the appropriate selection.

Q: Can these fuses be used without a holder?

A: No. All parts in this equivalence group, including S501-50-R, BK/GDA-50MA, GDA-50MA, 0216.050HXP, and 0216.050MXP, are classified as cartridge fuses requiring holder installation. Direct PCB mounting or holder-less installation is not supported.

Q: What approval agencies certify these fuse parts?

A: All parts carry multiple international certifications. Common certifications across the group include CSA, CCC, SEMKO, and UR. The S501-50-R additionally carries BSI, cULus, IMQ, and VDE certifications. Littelfuse parts carry CE and VDE certifications. Verify specific certification requirements for your application's geographic and regulatory jurisdiction.

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