Description
Overview
The Eaton Bussmann 170M4866D belongs to the renowned 170M Series of high speed square body semiconductor fuses, engineered specifically to protect power semiconductors such as thyristors, diodes, IGBTs, and MOSFETs from destructive overcurrents. Rated at 630 A and 690 V AC with a 200 kA interrupt rating, this Class aR fuse responds within microseconds to limit let-through energy (I²t) before semiconductor junctions can be damaged. Its DIN 43620 DIN 1 knife blade contact format ensures easy integration into standard DIN-compatible fuse holders and busbars used widely in Indian industrial switchgear panels.
Key Features
- High Speed Class aR Rating — Ultra-fast current limiting action protects semiconductor devices that standard fuses cannot safeguard
- 630 A Amperage Rating — Suitable for high-current semiconductor-based drive and converter systems up to 630 amperes
- 690 V AC Voltage Rating — Compatible with standard 415 V and 690 V industrial supply systems common across Indian industries
- 200 kA Breaking Capacity — Exceptional fault interruption capability ensures safe operation even on high prospective fault current systems
- DIN 43620 DIN 1 Knife Blade Construction — Industry-standard form factor enabling direct replacement and compatibility with existing DIN fuse holders and panel designs
- Dual Indicator Type D — Provides two visible strike indicators for quick visual confirmation of fuse operation, reducing panel downtime
- CE Marked and RoHS Compliant — Meets European and international regulatory requirements for industrial and export-grade panels
- IEC 60269-4 Certified — Tested and rated to the international standard for industrial semiconductor protection fuses
- Low I²t Let-Through Energy — Minimises thermal and mechanical stress on protected semiconductor components during fault conditions
Technical Specifications
| Specification | Value |
|---|---|
| Catalog Number | 170M4866D |
| Series | Bussmann 170M |
| Amperage Rating | 630 A |
| Voltage Rating (AC) | 690 V |
| Interrupt Rating | 200 kA |
| Breaking Capacity | 200 kA |
| Fuse Class | Class aR |
| Construction | DIN 43620 DIN 1 format, knife blade contacts |
| Fuse Indicator | Dual Indicator (Type D) |
| Standard | IEC 60269-4 |
| Compliances | CE Marked, RoHS Compliant |
| Certifications | IEC Rated |
| Application | Semiconductor protection, DC common bus, DC drives, power converters, rectifiers, VFDs, soft starters, thyristor stacks |
Applications & Selection Guide
The 170M4866D is the correct choice when protecting power semiconductor devices rated at or below 630 A in AC systems up to 690 V. Its Class aR rating means it is specifically designed and tested for semiconductor protection only — it should always be used alongside a general-purpose backup fuse or circuit breaker for cable and bus protection. Typical installations include the DC bus of variable frequency drives (VFDs), input and output stages of soft starters, thyristor stacks in industrial heating systems, rectifier bridges in UPS and battery charger assemblies, and IGBT modules in power converters.
In the Indian industrial landscape, this fuse is widely specified by panel builders and OEMs in Coimbatore, Chennai, Pune, Ahmedabad, and other manufacturing hubs for textile machinery drives, CNC machine tool power stages, crane and hoist drive systems, water treatment pump drives, and renewable energy inverter assemblies. The DIN 43620 DIN 1 format is well established in the Indian market, and Shansen Enterprises maintains ready stock for urgent project and maintenance requirements.
When selecting this fuse, verify that the continuous load current does not exceed the 630 A rating and that the system prospective short circuit current is within the 200 kA breaking capacity. For DC bus applications, consult the Eaton Bussmann 170M Series DC voltage derating tables, as DC voltage ratings differ from AC ratings. Shansen Enterprises’ technical team in Coimbatore can assist with application-specific fuse selection and I²t coordination checks.
Why Buy from Shansen Enterprises?
- Authorized Eaton Channel Partner in Coimbatore — supply genuine Bussmann products with full traceability
- 100% genuine products supplied with manufacturer warranty and documentation
- Pan-India delivery to all major cities and industrial zones
- WhatsApp technical support for fuse selection, coordination, and replacement queries
- Bulk pricing and project discounts available for panel builders, OEMs, and EPC contractors
Compatible Products & Accessories
- Eaton Bussmann 170M Series DIN 43620 Fuse Holders — matching knife blade contact holders for DIN 1 size fuses
- Eaton Bussmann 170M Series Fuse Bases and Busbars — panel-mount assemblies for multi-fuse semiconductor protection banks
- Eaton Bussmann Fuse Monitoring Relays — for remote indication of blown fuse status via the Type D dual indicator
- Eaton Bussmann 170M Series companion fuses in adjacent ampere ratings (500 A, 560 A, 700 A, 800 A) for drive system coordination
- Eaton General Purpose NH Fuse Links — for upstream backup protection of cables and busbars feeding the 170M4866D
Frequently Asked Questions
What does Class aR mean for the 170M4866D and how is it different from Class gG?
Class aR fuses are high speed current-limiting fuses designed exclusively for semiconductor protection. They operate in the partial range — meaning they only interrupt currents significantly above their rated current, and therefore must always be used with a backup fuse (Class gG or gR) for overload and lower-level fault protection. Class gG fuses, by contrast, provide full-range protection from overload through short circuit but are far too slow to protect semiconductor junctions, which can be destroyed in microseconds. The 170M4866D is a Class aR fuse and must be applied accordingly within a coordinated protection scheme.
Can the Eaton Bussmann 170M4866D be used on a 415 V AC system in India?
Yes. The 170M4866D is rated for 690 V AC, which means it is fully suitable for use on 415 V AC systems — the lower system voltage is within its rated voltage envelope. In fact, operating at a lower voltage than the fuse’s rated voltage typically results in a higher effective breaking capacity and better arc quenching performance. This makes it an excellent choice for 415 V industrial drive and converter panels widely used across Indian manufacturing facilities.
What is the purpose of the Dual Indicator Type D on the 170M4866D?
The Dual Indicator (Type D) on the 170M4866D provides two separate visual strike pins that are expelled when the fuse operates. This allows maintenance technicians to immediately identify a blown fuse by visual inspection of the panel, even in multi-fuse assemblies. The dual indicator design also supports connection to external fuse monitoring relay circuits, enabling remote alarm or tripping signals to a control panel or PLC when the fuse operates — an important feature for minimising unplanned downtime in automated production environments.
What fuse holder is compatible with the Eaton Bussmann 170M4866D?
The 170M4866D uses DIN 43620 DIN 1 format knife blade contacts. It requires a fuse holder or fuse base designed for DIN 43620 DIN 1 size, which is a standard format widely available from Eaton Bussmann and other panel component manufacturers. Shansen Enterprises can recommend and supply matching Eaton Bussmann fuse holders and busbar assemblies to ensure a complete, compatible, and warranted installation. Contact our team in Coimbatore for a complete bill of materials for your panel design.
Is the 170M4866D suitable for DC bus protection in VFD panels?
Yes, the Eaton Bussmann 170M Series is a commonly specified solution for DC bus protection in variable frequency drive (VFD) panels and DC common bus drive systems. However, DC voltage ratings for semiconductor fuses are different from and generally lower than their AC voltage ratings due to the absence of natural current zero crossings in DC circuits. You must consult the Eaton Bussmann 170M Series datasheet DC voltage derating tables to confirm the appropriate DC voltage rating for your application before installation. Shansen Enterprises’ technical team can assist with this verification.
How do I order the Eaton Bussmann 170M4866D from Shansen Enterprises?
Ordering the 170M4866D from Shansen Enterprises is straightforward. You can reach us via WhatsApp or phone for an immediate quote and stock availability check, or send your inquiry with the catalog number, required quantity, and delivery location to our email. As an authorized Eaton channel partner based in Coimbatore, we supply genuine Bussmann products with full manufacturer documentation and offer pan-India delivery. For bulk orders, project requirements, or repeat supply agreements, contact us to discuss pricing, lead times, and consolidated shipment options tailored to your procurement schedule.
