Description
Overview
The Eaton Bussmann 700FMM is a 700A high-speed Class aR fuse from the Bussmann FMM series, engineered specifically for semiconductor protection in high-power industrial applications. The double-barrel BS88 body format allows this fuse to handle 700A continuous current while delivering the ultra-fast current-limiting action needed to protect sensitive power semiconductors before they reach destructive energy levels. With a 200 kA breaking capacity and dual voltage ratings of 690V AC and 450V DC, the 700FMM is a versatile choice for AC and DC power conversion systems across Indian industries.
Key Features
- 700A Ampere Rating — handles high continuous currents in large power conversion equipment without nuisance opening
- 690V AC / 450V DC Rated — dual voltage ratings suit both AC-side and DC bus semiconductor protection
- 200 kA Breaking Capacity — safely interrupts extreme fault currents to prevent catastrophic equipment damage
- Class aR Performance — range-rated semiconductor fuse characteristic provides fast response within the current range where semiconductors are most vulnerable
- Double-Barrel BS88 Body — reinforced construction handles the mechanical and thermal stresses of high-current semiconductor protection duty
- IEC 60269-4 / BS88 Part 4 Compliant — meets internationally recognised standards for semiconductor fuse performance and testing
- CE Marked & RoHS Compliant — approved for European and global markets; environmentally responsible construction
- IEC Rated & UL Recognized — dual certification supports use in equipment destined for multiple markets including North America
- Current-Limiting Action — limits let-through I²t energy to protect thyristor stacks, SCR modules, rectifier bridges, and IGBT assemblies
- Bussmann FMM Series Heritage — engineered by Eaton’s Bussmann division with decades of semiconductor protection expertise
Technical Specifications
| Specification | Value |
|---|---|
| Catalog Number | 700FMM |
| Series | Bussmann FMM |
| Amperage Rating | 700 A |
| Rated Voltage AC | 690 V |
| Rated Voltage DC | 450 V |
| Breaking Capacity | 200 kA |
| Fuse Class | Class aR |
| Fuse Type | High Speed British Standard — Double Barrel |
| 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 700FMM is specified wherever high-power semiconductor devices must be protected against short-circuit faults in AC and DC power systems. Typical installations include DC common bus drive systems where multiple VFDs share a common DC link, large rectifier panels converting three-phase AC to DC for electrochemical or metal processing loads, and high-current thyristor stacks used in soft starters and AC power controllers. The 700A rating targets equipment in the range of several hundred kilowatts, commonly found in heavy industries across India such as steel plants, paper mills, cement manufacturing, and water treatment infrastructure.
Class aR is the correct fuse class for semiconductor protection duty. Unlike general-purpose gG fuses, Class aR fuses are specifically designed to operate within the current range critical to semiconductor survival — they will not open under normal overload conditions but will current-limit and clear a fault before the semiconductor’s I²t withstand is exceeded. Engineers must confirm that the fuse’s rated I²t is less than the semiconductor’s I²t rating and that continuous current does not exceed 700A RMS in the installation. The 690V AC rating accommodates standard 415V Indian distribution systems as well as 480V and 600V industrial bus voltages, while the 450V DC rating covers typical rectified DC bus levels in drive systems.
Industries in Coimbatore and across Tamil Nadu that regularly specify FMM series fuses include textile machinery manufacturers, pump and motor drive OEMs, power electronics panel builders, and UPS and inverter manufacturers. The double-barrel body requires an appropriately rated FMM-series fuse holder or fuse switch-disconnector — Shansen Enterprises can advise on compatible Eaton Bussmann fuse carriers and disconnectors for this body size.
Why Buy from Shansen Enterprises?
- Authorized Eaton Channel Partner in Coimbatore — genuine products with full manufacturer backing
- 100% genuine Eaton Bussmann fuses supplied with warranty and traceability
- Pan-India delivery — we ship to all major industrial cities and tier-2 locations
- WhatsApp technical support — quick help on fuse selection, sizing, and compatible holders
- Bulk pricing for panel builders, OEMs, and EPC contractors
Compatible Products & Accessories
- Eaton Bussmann FMM Series Fuse Holders and Fuse Carriers (double-barrel, 700A rated)
- Eaton Bussmann FMM Series Fuse Switch-Disconnectors
- Other FMM Series Ratings — 550FMM, 630FMM, 800FMM for adjacent current ratings
- Eaton Bussmann SquareBody High-Speed Fuses for alternative form factors
- DIN-Rail Semiconductor Fuse Holders for panel integration
- Eaton Bussmann Fuse Monitoring and Blown-Fuse Indicators
Frequently Asked Questions
What is the difference between Class aR and Class gR semiconductor fuses?
Class aR fuses are range-rated, meaning they only operate within the current range harmful to semiconductors — typically above 3 to 5 times their rated current. They do not provide overload protection and must be used alongside a main circuit breaker or contactor for overload duty. Class gR fuses are full-range rated and provide both overload and short-circuit protection for semiconductor devices. The 700FMM is a Class aR fuse and requires a separate overload protective device in the circuit.
Can the 700FMM be used on a 415V AC Indian power system?
Yes. The 700FMM is rated for 690V AC, which makes it fully suitable for use on 415V AC three-phase Indian distribution systems. The 690V rating provides an additional safety margin and also allows the same fuse to be used in 480V or 600V industrial systems, reducing the need for multiple stock-keeping units across different voltage applications.
What DC bus voltage is the 700FMM rated for?
The 700FMM carries a DC voltage rating of 450V. This covers the typical rectified DC bus voltage derived from a 415V AC three-phase supply, which nominally produces approximately 560V DC at peak but operates at lower average bus levels in practical drive systems. Always verify the maximum DC bus voltage in your application does not exceed 450V DC before specifying this fuse for DC-side protection.
What fuse holder or fuse carrier is compatible with the 700FMM double-barrel body?
The 700FMM requires an Eaton Bussmann FMM series fuse holder or fuse switch-disconnector rated for the double-barrel body at 700A and 690V. The specific holder model depends on the mounting arrangement, busbar configuration, and whether isolation capability is required. Shansen Enterprises can confirm the correct compatible holder for your panel design — contact us via WhatsApp or email with your application details for a precise recommendation.
Is the 700FMM RoHS and CE compliant for export equipment?
Yes. The Eaton Bussmann 700FMM carries CE marking and is RoHS compliant, confirming it meets European Union directives on product safety and restriction of hazardous substances. It is also IEC Rated and UL Recognized, supporting use in equipment destined for North American markets. These dual certifications make the 700FMM suitable for Indian OEMs manufacturing panels and drive systems for both domestic and export markets.
How do I order the Eaton Bussmann 700FMM from Shansen Enterprises?
You can request a quote for the Eaton Bussmann 700FMM by clicking the WhatsApp button on this page or by emailing Shansen Enterprises directly through shansenenterprises.com. Please share the catalog number 700FMM, required quantity, and your delivery location in India. Our team in Coimbatore will respond with pricing, stock availability, and estimated delivery time. Bulk orders from panel builders and OEMs are welcome and attract preferential pricing.
