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Equivalent & Substitute Parts for S501-6.3-R
Part Overview
The S501-6.3-R is a ceramic cartridge fuse manufactured by Eaton - Electronics Division, rated at 6.3 A, 250 V AC/DC with fast-blow response characteristics. This fuse is designed for 5mm x 20mm holder applications and is ROHS3 compliant. The part is currently active in production with 736 units in stock. Equivalent and substitute parts are identified to provide design flexibility, ensure supply chain continuity, and accommodate specific application requirements such as operating temperature ranges, breaking capacity specifications, and regulatory certifications.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Current Rating | 6.3 A |
| Voltage Rating (AC) | 250 V |
| Fuse Type | Cartridge, Ceramic |
| Package / Case | 5mm x 20mm |
| Response Time | Fast Blow |
| Breaking Capacity @ Rated Voltage | 1.5 kA |
| Mounting Type | Requires Holder |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution eligibility is determined by strict equivalence across the following critical parameters: current rating (6.3 A), voltage rating (250 V AC), fuse type (cartridge ceramic), package dimensions (5mm x 20mm), response time (fast blow), and breaking capacity (1.5 kA minimum). All listed substitute parts meet these core electrical and mechanical requirements. Variations in melting I²t values, DC cold resistance, operating temperature ranges, and approval agencies are documented but do not disqualify substitution when the primary electrical characteristics remain identical. Parts are grouped by manufacturer to facilitate procurement decisions based on availability, certification requirements, and supply chain preferences.
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Current Rating (A) | Voltage Rating (V AC) | Fuse Type | Package | Response Time | Breaking Capacity (kA) | Melting I²t | DC Cold Resistance (Ohms) | Operating Temperature | Inventory (Pcs) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| S501-6.3-R | Eaton - Electronics Division | 6.3 | 250 | Cartridge, Ceramic | 5mm x 20mm | Fast Blow | 1.5 | 48 | 0.014 | Not specified | 736 |
| BK/GDA-6.3A | Eaton - Electronics Division | 6.3 | 250 | Cartridge, Ceramic | 5mm x 20mm | Fast Blow | 1.5 | 48 | 0.014 | Not specified | 1701 |
| BK/S501-6.3-R | Eaton - Electronics Division | 6.3 | 250 | Cartridge, Ceramic | 5mm x 20mm | Fast Blow | 1.5 | 48 | 0.014 | Not specified | 1142 |
| BK1/S501-6.3-R | Eaton - Electronics Division | 6.3 | 250 | Cartridge, Ceramic | 5mm x 20mm | Fast Blow | 1.5 | 48 | 0.014 | Not specified | 1763 |
| 021606.3MXP | Littelfuse Inc. | 6.3 | 250 | Cartridge, Ceramic | 5mm x 20mm | Fast Blow | 1.5 | 56.43 | 0.0137 | -55°C ~ 125°C | 2445 |
| 0001.1012 | SCHURTER Inc. | 6.3 | 250 | Cartridge, Ceramic | 5mm x 20mm | Fast Blow | 1.5 | 36.7 | Not specified | -55°C ~ 125°C | 38446 |
| 021606.3HXP | Littelfuse Inc. | 6.3 | 250 | Cartridge, Ceramic | 5mm x 20mm | Fast Blow | 1.5 | 56.43 | 0.0137 | -55°C ~ 125°C | 1300 |
| 021606.3TXP | Littelfuse Inc. | 6.3 | 250 | Cartridge, Ceramic | 5mm x 20mm | Fast Blow | 1.5 | 56.43 | 0.0137 | -55°C ~ 125°C | 892 |
| 021606.3VXP | Littelfuse Inc. | 6.3 | 250 | Cartridge, Ceramic | 5mm x 20mm | Fast Blow | 1.5 | 56.43 | 0.0137 | -55°C ~ 125°C | 819 |
| 23016300021P | Littelfuse Inc. | 6.3 | 250 | Cartridge, Ceramic | 5mm x 20mm | Fast Blow | 1.0 | 5 | Not specified | -25°C ~ 70°C | 1287 |
| FCC-6.3A | OptiFuse | 6.3 | 250 | Cartridge, Ceramic | 5mm x 20mm | Fast Blow | 0.2 | 48.237 | 0.0129 | -55°C ~ 125°C | 702 |
Engineering Selection Recommendations
Eaton - Electronics Division (Primary Manufacturer Variants)
The parts BK/GDA-6.3A, BK/S501-6.3-R, and BK1/S501-6.3-R are direct equivalents from the same manufacturer as the S501-6.3-R. These parts share identical electrical specifications, melting I²t values, and DC cold resistance. Selection among these variants is based on series designation and inventory availability. BK1/S501-6.3-R offers the highest inventory level at 1763 units. All three variants carry BSI, CCC, CSA, and VDE certifications, ensuring regulatory compliance across international markets.
Littelfuse Inc. (021606 Series)
The Littelfuse 021606.3MXP, 021606.3HXP, 021606.3TXP, and 021606.3VXP parts are parametric equivalents with identical electrical ratings and breaking capacity. These parts feature extended operating temperature ranges (-55°C to 125°C) compared to the main part and carry comprehensive international certifications including BSI, CCC, CE, CSA, KC, PSE, SEMKO, UR, and VDE. Melting I²t values are slightly elevated at 56.43 compared to 48 for the S501-6.3-R. DC cold resistance is marginally lower at 0.0137 Ohms. The 021606.3MXP variant has the highest inventory availability at 2445 units among Littelfuse options.
SCHURTER Inc. (0001.1012)
The SCHURTER 0001.1012 is a parametric equivalent with identical electrical specifications and breaking capacity. This part offers the highest inventory availability across all substitutes at 38446 units. Operating temperature range extends to -55°C to 125°C. Melting I²t is lower at 36.7. Certifications include CCC, cURus, KC, PSE/JET, and VDE.
Littelfuse 23016300021P (Limited Substitution)
The 23016300021P differs in breaking capacity (1.0 kA versus 1.5 kA) and melting I²t (5 versus 48), with a narrower operating temperature range (-25°C to 70°C). This part is a parametric equivalent for current, voltage, and package specifications but exhibits reduced performance characteristics. Selection requires confirmation that application requirements do not exceed 1.0 kA breaking capacity.
OptiFuse FCC-6.3A (Limited Substitution)
The FCC-6.3A differs significantly in breaking capacity (0.2 kA versus 1.5 kA), making it unsuitable for applications requiring the full 1.5 kA breaking capacity of the S501-6.3-R. This part is a parametric equivalent for current, voltage, and package specifications only. Selection requires explicit confirmation that application breaking capacity requirements do not exceed 0.2 kA.
Frequently Asked Questions (FAQ)
Q: Can all listed substitute parts be used interchangeably with the S501-6.3-R?
A: All substitute parts share identical current rating (6.3 A), voltage rating (250 V AC), fuse type (cartridge ceramic), and package dimensions (5mm x 20mm). However, breaking capacity and melting I²t values vary. The 23016300021P and FCC-6.3A have reduced breaking capacities (1.0 kA and 0.2 kA respectively) compared to the S501-6.3-R (1.5 kA). Selection must confirm that application requirements align with the specific breaking capacity of the chosen substitute.
Q: What is the significance of melting I²t values in fuse substitution?
A: Melting I²t indicates the thermal energy required to melt the fuse element. The S501-6.3-R has a melting I²t of 48. Littelfuse variants (021606 series) have values of 56.43, SCHURTER 0001.1012 has 36.7, and 23016300021P has 5. These variations affect response characteristics but do not disqualify substitution when breaking capacity and electrical ratings remain equivalent.
Q: Are there differences in operating temperature ranges among the substitutes?
A: Yes. The S501-6.3-R does not specify an operating temperature range. Littelfuse 021606 series parts, SCHURTER 0001.1012, and OptiFuse FCC-6.3A operate from -55°C to 125°C. The 23016300021P operates from -25°C to 70°C. Applications requiring extended temperature performance should select parts with -55°C to 125°C ratings.
Q: What certifications should I verify for my specific application?
A: The S501-6.3-R carries BSI, CCC, CSA, cURus, IMQ, SEMKO, and VDE certifications. Littelfuse 021606 series parts carry BSI, CCC, CE, CSA, KC, PSE, SEMKO, UR, and VDE certifications. SCHURTER 0001.1012 carries CCC, cURus, KC, PSE/JET, and VDE certifications. OptiFuse FCC-6.3A carries cULus and UL 248 certifications. Confirm that the selected substitute meets all regulatory requirements for your target market.
Q: Which substitute offers the best inventory availability?
A: SCHURTER 0001.1012 has the highest inventory at 38446 units. Among Littelfuse options, 021606.3MXP has 2445 units. Among Eaton variants, BK1/S501-6.3-R has 1763 units. Inventory levels should be verified at the time of procurement as stock quantities change.
Q: Can I use the 23016300021P or FCC-6.3A as direct replacements?
A: These parts are parametric equivalents for current, voltage, and package specifications but have significantly reduced breaking capacities. The 23016300021P (1.0 kA) and FCC-6.3A (0.2 kA) are not direct replacements for the S501-6.3-R (1.5 kA). Use only if your application requirements explicitly allow for reduced breaking capacity.
Q: What is the difference between the Eaton variants (S501-6.3-R, BK/GDA-6.3A, BK/S501-6.3-R, BK1/S501-6.3-R)?
A: All four Eaton parts share identical electrical specifications, melting I²t (48), and DC cold resistance (0.014 Ohms). The primary differences are series designation (S501 versus GDA) and inventory availability. BK/GDA-6.3A belongs to the GDA series, while the others are S501 series. Selection can be based on series preference and stock availability.
Q: Are all substitute parts ROHS3 compliant?
A: Yes. All listed substitute parts are ROHS3 compliant, including the main part S501-6.3-R.
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