Description
Overview
The Eaton Bussmann 350FM is a high speed, single barrel, BS88-type semiconductor protection fuse rated at 350 A and 690 V AC (450 V DC), belonging to the Bussmann FM Series. Built to IEC 60269-4 and BS88 Part 4 standards, it delivers a 200 kA breaking capacity with Class aR current-limiting performance to safeguard power semiconductor devices from destructive fault currents. This fuse is CE marked, RoHS compliant, IEC rated, and UL recognized, making it suitable for use in global and Indian industrial power electronics installations.
Key Features
- Class aR Current-Limiting Performance — restricts let-through energy to protect semiconductor junctions during fault conditions
- 200 kA Breaking Capacity — handles high prospective fault currents typical in industrial power systems
- 690 V AC / 450 V DC Dual Voltage Rating — compatible with both AC and DC bus applications in a single fuse body
- Single Barrel Construction — compact, space-efficient form factor for high-density panel and drive enclosures
- BS88 Part 4 / IEC 60269-4 Compliant — meets internationally recognized standards for semiconductor fuse performance
- CE Marked & RoHS Compliant — meets European safety and environmental directives for global deployments
- IEC Rated & UL Recognized — dual certification supports both IEC and North American standard installations
- Bussmann FM Series — proven, field-tested platform widely used in industrial drives and converter panels across India
Technical Specifications
| Specification | Value |
|---|---|
| Catalog Number | 350FM |
| Series | Bussmann FM |
| Fuse Type | High Speed British Standard, Single Barrel |
| Fuse Class | Class aR |
| Amperage Rating | 350 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 Eaton Bussmann 350FM is the correct choice when protecting power semiconductor devices — such as SCRs, IGBTs, thyristors, and diodes — in medium-to-high current drive and converter panels. At 350 A and 690 V AC, it covers the upper range of industrial AC drive input stages and DC common bus architectures commonly deployed in metal processing, textile machinery, water treatment, and material handling systems across Coimbatore and the broader Tamil Nadu industrial belt.
Class aR fuses are specifically rated for semiconductor protection duty. Unlike general-purpose gG or gR fuses, aR fuses are optimized for fast, precise current limitation at high fault levels — their I²t let-through values are characterized to stay within the withstand ratings of modern IGBT modules and thyristor assemblies. Select the 350FM when your drive or converter OEM datasheet specifies a 350 A aR fuse at 690 V AC or 450 V DC with a minimum 200 kA interrupt rating.
In Indian industrial applications — including steel rolling mills, cement plant drives, solar inverter banks, lift and escalator motor drives, and UPS rectifier assemblies — the 350FM is widely used as the primary semiconductor protection element in both new installations and retrofit upgrades. Its BS88 / IEC 60269-4 compliance ensures straightforward approval in CE-marked machine exports as well as Bureau of Indian Standards-referenced panel designs.
Why Buy from Shansen Enterprises?
- Authorized Eaton Channel Partner in Coimbatore — assured product authenticity
- 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 fuse selection, cross-reference, and sizing queries
- Bulk and project pricing available for panel builders, OEMs, and EPCs
Compatible Products & Accessories
- Eaton Bussmann FM Series fuse holders and fuse bases (single barrel type)
- Eaton Bussmann DM Series high speed fuses (alternative square body format)
- Eaton Bussmann BS88 fuse carriers and disconnectors for panel mounting
- Eaton Bussmann striker-pin fuse status indicators (where applicable)
- Eaton Bussmann complementary aR fuses in adjacent ratings (200FM, 250FM, 315FM, 400FM) for coordinated protection
- Eaton surge protective devices (SPDs) for converter panel upstream protection
Frequently Asked Questions
What is the difference between a Class aR and a Class gR fuse, and why does the 350FM use Class aR?
Class aR fuses are designed exclusively for semiconductor protection — they operate only in the current-limiting region above their minimum breaking current and are not intended to carry sustained overloads. Class gR fuses, by contrast, provide full-range protection including overload duty. The 350FM uses Class aR because power semiconductors such as IGBTs and SCRs can be destroyed in microseconds by fault currents; the aR characteristic guarantees a precisely controlled, fast arc extinction with minimum I²t energy let-through, keeping that energy within the withstand capability of the semiconductor junction.
Can the Eaton Bussmann 350FM be used on a 400 V AC system?
Yes. The 350FM is rated up to 690 V AC, so it is fully suitable for use on 400 V AC systems. Using a fuse rated above the system voltage is standard practice and introduces no operational issues. The fuse’s current-limiting and arc extinction characteristics remain valid across the full voltage range up to its 690 V AC maximum rating.
What DC voltage systems is the 350FM rated for?
The Eaton Bussmann 350FM carries a DC voltage rating of 450 V DC. This makes it suitable for DC common bus systems, battery-backed drive systems, and DC-link protection in converters operating at up to 450 V DC. Always verify that the actual DC bus voltage in your application does not exceed this rating under any operating or transient condition.
Is the Eaton Bussmann 350FM suitable for VFD input protection in Indian industrial panels?
Yes, the 350FM is widely applied as semiconductor protection on the DC bus or input rectifier stage of Variable Frequency Drives (VFDs) used in Indian industrial panels. Its 690 V AC / 450 V DC rating covers standard Indian LV distribution voltages, and its 200 kA breaking capacity is adequate for high-fault-level industrial installations. Always confirm the drive manufacturer’s recommended fuse type, amperage, and I²t rating before specifying the fuse, as some VFD OEMs provide specific Bussmann part numbers in their documentation.
Does the 350FM comply with RoHS and CE requirements for export panels?
Yes. The Eaton Bussmann 350FM is both CE Marked and RoHS Compliant, satisfying EU machinery directive and hazardous substances requirements. It is also IEC Rated and UL Recognized, supporting use in panels destined for European, North American, and global markets. These certifications are particularly relevant for Indian panel builders and machine exporters who need pre-certified components to streamline their own CE marking process.
How do I order the Eaton Bussmann 350FM from Shansen Enterprises?
You can request a quote for the Eaton Bussmann 350FM directly from Shansen Enterprises via WhatsApp or email using the contact buttons on this page. Share your required quantity, delivery location, and any project details, and our team will respond with pricing, availability, and estimated delivery timeline. We supply genuine Eaton Bussmann products pan-India from our Coimbatore base, with support for bulk orders, project procurement, and urgent requirements.
