Description
Overview
The Eaton Bussmann 280FM is a high-speed, single barrel, BS88-type semiconductor protection fuse rated at 280A and 690V AC (450V DC), offering a breaking capacity of 200 kA. Designed to the Class aR rating per BS88 Part 4 and IEC 60269-4, this fuse provides ultra-fast current limiting action specifically engineered to protect sensitive semiconductor devices such as thyristors, diodes, IGBTs, and SCRs from damaging fault currents. It is CE marked, RoHS compliant, IEC rated, and UL recognized, making it suitable for use in industrial panels built and deployed across India and for export.
Key Features
- Class aR Rating — purpose-built for semiconductor protection with faster clearing times than general-purpose fuses, safeguarding diodes, thyristors, and IGBTs
- High Breaking Capacity — 200 kA interrupting rating handles severe fault currents in high-power industrial installations without risk of rupture
- Wide Voltage Range — rated 690V AC and 450V DC, covering both AC-side and DC bus protection requirements in a single fuse type
- Single Barrel Construction — compact, single-element body simplifies mounting in tight panel layouts and fuse holders
- BS88 Part 4 / IEC 60269-4 Compliance — internationally recognized standard ensures interoperability and acceptance in global OEM and EPC projects
- CE Marked and RoHS Compliant — meets European regulatory requirements; suitable for export-oriented machinery and panels
- IEC Rated and UL Recognized — dual certification supports projects with mixed international compliance requirements
- Bussmann FM Series — field-proven platform with wide availability of matching fuse holders, carriers, and accessories across Eaton’s product ecosystem
Technical Specifications
| Specification | Value |
|---|---|
| Catalog Number | 280FM |
| Series | Bussmann FM |
| Fuse Type | High Speed British Standard, Single Barrel |
| Fuse Class | Class aR |
| Amperage Rating | 280 A |
| Voltage Rating AC | 690 V |
| Voltage Rating DC | 450 V |
| 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 280FM is the preferred choice for engineers protecting semiconductor devices in medium-to-high power drive systems. Its Class aR characteristic means it is designed specifically to clear faults before the semiconductor junction reaches its damage threshold — unlike Class gG fuses, which are too slow for this purpose. It is ideal for the AC input or DC bus side of variable frequency drives (VFDs), soft starters, and rectifier bridges in the 280A current range operating on 415V or 690V AC supply systems common across Indian industrial facilities.
Typical installations in India where the 280FM is specified include steel plant auxiliary drives, cement mill VFD panels, water treatment pump drives, textile machinery inverter panels, and large UPS rectifier banks. Panel builders and OEMs in Coimbatore, Chennai, Pune, Ahmedabad, and Hyderabad regularly use the Bussmann FM series in both MCC (Motor Control Center) and standalone drive panels where semiconductor protection is a design requirement.
When selecting this fuse, verify that the continuous load current does not exceed 280A and that the prospective short circuit current at the installation point does not exceed 200 kA. Ensure the fuse holder and carrier selected are rated for BS88 Part 4 / IEC 60269-4 duty at the required voltage. Consult Shansen Enterprises for holder and carrier recommendations compatible with the 280FM.
Why Buy from Shansen Enterprises?
- Authorized Eaton Channel Partner in Coimbatore — genuine products with full traceability
- 100% genuine Eaton Bussmann products supplied with manufacturer warranty
- Pan-India delivery to all major industrial cities and tier-2 locations
- WhatsApp technical support for product selection, cross-referencing, and application queries
- Bulk pricing available for panel builders, OEMs, EPC contractors, and system integrators
Compatible Products & Accessories
- Eaton Bussmann FM series fuse holders and carriers (matching BS88 Part 4 single barrel format)
- Eaton Bussmann fuse base / DIN rail mounting accessories for FM series
- Eaton Bussmann semiconductor protection fuses in adjacent ratings (250FM, 315FM, 355FM) for coordinated protection design
- Eaton Bussmann DC fuse links rated for 450V DC bus protection in common bus drive systems
- Fuse monitoring and blown-fuse indication accessories compatible with FM series holders
Frequently Asked Questions
What is the difference between a Class aR fuse and a Class gG fuse for semiconductor protection?
A Class gG fuse is a general-purpose fuse designed to protect cables and wiring against overloads and short circuits. Its clearing time at high fault currents is relatively slow compared to the damage threshold of semiconductor devices such as thyristors and diodes. A Class aR fuse, such as the Eaton Bussmann 280FM, is specifically designed for semiconductor protection and has a much faster current-limiting action. It clears the fault before the I²t energy reaches the level that would damage the semiconductor junction. For any application involving VFDs, rectifiers, thyristor stacks, or power converters, Class aR is the correct fuse class — Class gG is not a substitute.
Can the 280FM be used for DC bus protection in a VFD or drive system?
Yes. The Eaton Bussmann 280FM is rated at 450V DC in addition to its 690V AC rating, making it suitable for DC bus protection in variable frequency drives, common DC bus systems, and rectifier-fed DC drives. Always confirm that the actual DC bus voltage does not exceed 450V DC and that the prospective fault current is within the 200 kA breaking capacity. For DC applications, also verify the fuse holder and circuit connections are rated for DC duty.
What fuse holder or carrier is compatible with the Eaton Bussmann 280FM?
The 280FM uses the Bussmann FM series single barrel body form factor designed to BS88 Part 4 / IEC 60269-4. Compatible fuse holders and carriers from the Eaton Bussmann range for this form factor should be selected based on the current rating (280A) and voltage rating (690V AC / 450V DC). Shansen Enterprises can recommend the correct holder, carrier, and DIN rail mounting accessories. Contact us via WhatsApp or email with your panel design details for a complete recommendation.
Is the Eaton Bussmann 280FM suitable for use in Indian industrial panels on a 415V AC supply?
Yes. The 280FM is rated at 690V AC, which means it is fully suitable for use on 415V AC (three-phase, 50 Hz) supply systems standard across Indian industrial installations. Operating the fuse below its maximum voltage rating is standard practice and does not affect its protective characteristics. It will provide the same Class aR semiconductor protection performance at 415V as at 690V.
Does the 280FM come with a fuse condition indicator?
The raw specifications for the Eaton Bussmann 280FM do not list an integrated fuse condition indicator as a standard feature. If blown-fuse indication is required for your panel design, Eaton Bussmann offers separate fuse monitoring accessories and indicator options compatible with the FM series holder system. Please contact Shansen Enterprises to discuss indicator options and compatible accessories for your specific installation.
How do I order the Eaton Bussmann 280FM from Shansen Enterprises?
You can request a quote for the Eaton Bussmann 280FM directly from Shansen Enterprises by clicking the WhatsApp button or the email quote button on this page. Please mention the catalog number 280FM, the quantity required, and your delivery location anywhere in India. Our team will respond promptly with pricing, availability, and estimated delivery timeline. Shansen Enterprises is an authorized Eaton channel partner based in Coimbatore and supplies genuine Eaton Bussmann products pan-India to panel builders, OEMs, and industrial end users.
