Description
Overview
The Eaton Bussmann 50FE is a single barrel, high speed BS88-type semiconductor protection fuse rated at 50 A and 690 V AC (450 V DC), belonging to the Bussmann FE series. Engineered to provide ultra-fast arc interruption with a 200 kA breaking capacity, it safeguards expensive power semiconductor devices — including thyristors, IGBTs, SCRs, and diodes — from destructive fault currents in industrial power electronics. Manufactured to BS88 Part 4 and IEC 60269-4 standards, the 50FE is a trusted choice for panel builders and OEMs across India building drives, converters, and soft starter panels.
Key Features
- High Speed Semiconductor Protection — Ultra-fast current limiting action protects thyristors, IGBTs, SCRs, and diodes before thermal damage occurs.
- 200 kA Breaking Capacity — Handles extreme prospective fault currents safely, suitable for high power industrial installations.
- 690 V AC / 450 V DC Dual Voltage Rating — Versatile for both AC and DC bus protection in drives, converters, and rectifier circuits.
- Class aR Fuse — Optimised for semiconductor protection duty; provides partial range current limiting as defined by IEC 60269-4.
- BS88 Part 4 / IEC 60269-4 Compliant — Meets internationally recognised standards for high speed fuses, ensuring compatibility with IEC-rated switchgear and panels.
- CE Marked & RoHS Compliant — Ready for use in CE-marked equipment and meets EU RoHS environmental directives, supporting export-oriented manufacturing in India.
- IEC Rated & UL Recognized — Dual certification supports use in both IEC and UL-standard equipment, easing approval for multi-market projects.
- Single Barrel Form Factor — Compact single barrel construction simplifies fuse holder selection and panel layout in space-constrained enclosures.
- Bussmann FE Series — Part of Eaton’s globally proven FE range, ensuring consistent quality, availability, and interchangeability across projects.
Technical Specifications
| Specification | Value |
|---|---|
| Catalog Number | 50FE |
| Series | Bussmann FE |
| Fuse Type | High Speed British Standard, Single Barrel |
| Fuse Class | Class aR |
| Amperage Rating | 50 A |
| Voltage Rating (AC) | 690 V AC |
| Voltage Rating (DC) | 450 V DC |
| Breaking Capacity | 200 kA |
| Standard | BS88 Part 4, IEC 60269-4 |
| Compliances | CE Marked, RoHS Compliant |
| Certifications | IEC Rated, UL Recognized |
| Application | Semiconductor protection, DC drives, VFDs, power converters, rectifiers, soft starters, thyristor stacks, DC common bus |
Applications & Selection Guide
The Eaton Bussmann 50FE is specifically selected for semiconductor protection duty in industrial power electronics — applications where standard gG or gM fuses are far too slow to prevent damage to costly switching devices. At 50 A and 690 V AC, it fits squarely into medium-power drive and converter designs, protecting the input or output bridge rectifiers, thyristor stacks, IGBT modules, and SCR-based soft starters from prospective fault currents up to 200 kA. The Class aR rating confirms it is designed as a back-up or partial-range device working in coordination with the semiconductor’s own I²t withstand capability.
In Indian industry, the 50FE is commonly specified in VFD panels for pump and fan drives in water treatment, textile mills, cement plants, steel rolling mills, and automotive manufacturing. Power converter OEMs in Coimbatore, Pune, and Chennai building rectifier units, UPS systems, battery chargers, and regenerative drives regularly use the FE series as their preferred semiconductor fuse. The DC voltage rating of 450 V makes it directly applicable to 400–450 V DC bus protection in common bus drive systems and solar inverter DC links.
When selecting the 50FE, verify the fuse’s I²t let-through value against the semiconductor manufacturer’s rated I²t withstand — this is the critical coordination check for Class aR applications. Ensure the matching fuse holder or fuse base is rated for the same voltage class and current. For higher or lower ampere ratings within the same FE series, alternative catalog numbers are available — contact Shansen Enterprises for a full series selection guide and application support.
Why Buy from Shansen Enterprises?
- Authorized Eaton Channel Partner in Coimbatore — supplying genuine Eaton Bussmann products across Tamil Nadu and India
- 100% genuine products supplied with manufacturer warranty and traceability
- Pan-India delivery — orders dispatched from Coimbatore to all major industrial cities
- WhatsApp technical support — fast responses on product selection, cross-references, and datasheet queries
- Bulk pricing for panel builders, OEMs, EPCs, and system integrators — contact us for project pricing
Compatible Products & Accessories
- Eaton Bussmann BS88 High Speed Fuse Holders and Bases (FE series compatible)
- Eaton Bussmann FE Series fuses — alternate ampere ratings (e.g. 25FE, 63FE, 80FE, 100FE)
- Eaton Bussmann High Speed DIN Rail Fuse Carriers for BS88 single barrel fuses
- Semiconductor protection fuse monitoring and blown fuse indication accessories
- Eaton Bussmann gR / aR series cylindrical and square body high speed fuses for alternative form factors
- Surge protection devices (SPDs) and EMC filters for VFD and drive panel assemblies
Frequently Asked Questions
What is the difference between a Class aR fuse and a Class gR fuse for semiconductor protection?
A Class aR (partial range) fuse like the 50FE is designed to clear only high overcurrents — those above the minimum breaking current — and must be coordinated with the semiconductor device’s own overload protection. A Class gR (full range) fuse covers the full range from overload through to short circuit. For most thyristor and IGBT protection applications, Class aR fuses are the correct choice as they offer the fastest arc interruption at fault current levels, minimising I²t let-through and protecting the semiconductor junction from thermal damage.
Can the Eaton Bussmann 50FE be used for DC bus protection in VFD panels?
Yes. The 50FE carries a DC voltage rating of 450 V, making it directly suitable for protecting DC bus circuits in variable frequency drives (VFDs), common DC bus systems, and rectifier bridges operating on 400–450 V DC buses. Always confirm the actual DC bus voltage in your application does not exceed 450 V DC under any operating condition, including regenerative braking transients.
What fuse holder or fuse base is compatible with the Eaton Bussmann 50FE?
The 50FE uses a BS88 Part 4 single barrel form factor. It requires a compatible BS88 high speed fuse holder or fuse carrier rated for the same voltage class (690 V AC / 450 V DC) and current. Eaton Bussmann offers a range of matching fuse bases and holders for the FE series. Contact Shansen Enterprises with your panel layout requirements — our team can recommend the correct fuse holder, including DIN rail mount and panel mount options available in Coimbatore.
Is the Eaton Bussmann 50FE compliant with Indian and international standards?
Yes. The 50FE is manufactured to BS88 Part 4 and IEC 60269-4, which are the internationally recognised standards for high speed semiconductor protection fuses. It is CE marked and RoHS compliant for use in CE-certified equipment exported from India, and it carries IEC rating and UL recognition, supporting use in equipment destined for both IEC and North American markets. These certifications make it readily acceptable to major OEMs, panel builders, and EPCs operating across India and globally.
How do I verify the correct ampere rating when replacing a semiconductor protection fuse?
Always replace with the identical catalog number — in this case 50FE — to ensure the fuse characteristics (voltage rating, I²t, peak let-through current, and time-current curve) remain consistent with the original design intent. Do not upsize the ampere rating, as a higher-rated fuse may fail to protect the semiconductor device adequately. If you are redesigning or rerating the circuit, consult the semiconductor manufacturer’s datasheet for the maximum permissible I²t and peak let-through current, then select the appropriate FE series fuse accordingly. Shansen Enterprises can assist with cross-reference and selection support.
How do I order the Eaton Bussmann 50FE from Shansen Enterprises?
Ordering the 50FE from Shansen Enterprises is straightforward. Click the WhatsApp button on this page to send us your requirement directly, or use the email enquiry form to request a quote. Please mention the catalog number (50FE), required quantity, and your delivery location. Our team in Coimbatore will respond promptly with pricing, availability, and estimated delivery timeline. We supply pan-India and offer bulk pricing for panel builders and OEMs. You can also reach us through shansenenterprises.com for any technical queries before placing your order.
