Description
Overview
The Eaton Bussmann 170M1321 is a high speed square body semiconductor fuse rated 250 A at 690 V AC, belonging to the renowned Bussmann 170M Series. Certified to IEC 60269-4 with a 200 kA interrupt rating, this Class aR fuse provides precise, high-speed protection for semiconductor devices in industrial power electronics applications. Its 000U/80 bolt-in square body construction makes it a reliable choice for panel builders and OEMs across India requiring fast-acting fuse protection in compact, standardized formats.
Key Features
- High Speed Class aR Rating — Responds faster than general-purpose fuses to protect IGBTs, SCRs, and diodes from destructive fault currents
- 250 A Current Rating — Suitable for medium-power drive and converter applications in industrial environments
- 690 V AC Voltage Rating — Compatible with standard 400 V and 690 V three-phase industrial power systems in India
- 200 kA Breaking Capacity — Handles high prospective fault currents found in industrial substations and MCC panels
- 000U/80 Square Body Format — Standardized form factor enabling easy replacement and cross-compatibility with existing fuse holders
- Bolt-In Connection — Ensures low-resistance, mechanically secure electrical contact for high-current applications
- IEC 60269-4 Compliant — Meets international semiconductor fuse standards for global and Indian project specifications
- CE Marked and RoHS Compliant — Ready for export projects and environmentally conscious panel builds
- UL/CSA Listed — Accepted for North American export equipment and multinational OEM panels
- No Fuse Indicator — Compact design without striker or visual indicator, ideal for space-constrained enclosures
Technical Specifications
| Specification | Value |
|---|---|
| Catalog Number | 170M1321 |
| Series | Bussmann 170M |
| Amperage Rating | 250 A |
| Voltage Rating (AC) | 690 V |
| Fuse Class | Class aR |
| Fuse Type | High Speed Square Body |
| Construction | Square body 000U/80 format with bolt-in connections |
| Breaking Capacity | 200 kA |
| Interrupt Rating | 200 kA |
| Fuse Indicator | None |
| Standard | IEC 60269-4 |
| Compliances | CE Marked, RoHS Compliant |
| Certifications | IEC Rated, UL/CSA Listed |
| Application | Semiconductor protection, DC common bus, DC drives, power converters, rectifiers, VFDs, soft starters, thyristor stacks |
Applications & Selection Guide
The Eaton Bussmann 170M1321 is specifically designed for semiconductor protection in high-power industrial electronics. Its Class aR rating means it is optimized exclusively for current limiting protection of power semiconductors — not for cable or motor protection — making it the correct choice when protecting IGBTs, SCRs, diodes, and thyristor modules in VFD input/output stages, DC common bus systems, and rectifier bridges operating on 690 V AC supply systems.
In India, this fuse is widely used in industries such as steel and metals processing, cement manufacturing, paper mills, water treatment, and renewable energy installations where variable frequency drives, soft starters, and power converters are critical assets. The 250 A rating and 690 V compatibility make it suitable for medium-voltage drive systems and power converter panels deployed across manufacturing plants in Coimbatore, Chennai, Pune, Ahmedabad, and other industrial hubs.
When selecting this fuse, confirm that your fuse holder or fuse base accepts the 000U/80 square body format with bolt-in terminations. For DC bus applications, verify DC voltage derating with your system design. The 200 kA breaking capacity provides substantial safety margin for most industrial installations with high available fault current. Contact Shansen Enterprises for application-specific selection guidance before ordering.
Why Buy from Shansen Enterprises?
- Authorized Eaton Channel Partner in Coimbatore — genuine products with full manufacturer backing
- 100% genuine Eaton Bussmann products supplied with warranty and traceability
- Pan-India delivery to all major cities and industrial zones
- WhatsApp technical support for product selection, cross-referencing, and application queries
- Bulk pricing and priority supply for panel builders, OEMs, and EPC contractors
Compatible Products & Accessories
- Eaton Bussmann 170M Series fuse holders and fuse bases for 000U/80 square body format
- Eaton Bussmann 170M Series fuses in adjacent current ratings (200 A, 315 A) for system coordination
- Eaton Bussmann semiconductor fuse mounting hardware and bus bar connectors
- Eaton DX and NZM series circuit breakers for upstream protection coordination
- Eaton Bussmann fuse blown indicators and monitoring accessories
Frequently Asked Questions
What does Class aR mean for the Eaton Bussmann 170M1321?
Class aR designates a fuse designed exclusively for semiconductor protection (aR = accompanying Range). Unlike Class gG general-purpose fuses, Class aR fuses operate only in the high overcurrent range and provide extremely fast current limiting action to protect power semiconductors such as IGBTs, thyristors, and diodes from damage during fault conditions. They should not be used as the sole overcurrent protection for cables or motors.
Is the 170M1321 suitable for use on a 415 V AC system in India?
Yes. The 170M1321 is rated for 690 V AC, which means it is fully suitable for use on standard 415 V (400 V nominal) three-phase industrial systems common in India. Using a higher-rated voltage fuse on a lower voltage system is electrically acceptable and provides additional voltage headroom. Confirm current rating and I²t characteristics match your semiconductor device requirements before finalizing selection.
Can the Eaton Bussmann 170M1321 be used for DC bus protection in VFD panels?
Yes, the 170M Series is commonly applied in DC common bus and DC drive applications. However, the DC voltage rating may differ from the stated AC voltage rating and must be verified from the Eaton Bussmann product datasheet or time-current characteristic curves before use. Contact Shansen Enterprises for DC application support and datasheet access.
What fuse holder is compatible with the 170M1321 square body format?
The 170M1321 uses the 000U/80 square body format with bolt-in connections. Compatible fuse holders and bases from the Eaton Bussmann range designed for 000U/80 square body semiconductor fuses should be used. Shansen Enterprises can supply matching fuse bases and hardware — contact us with your panel layout details for a complete recommendation.
Does the 170M1321 include a fuse indicator or striker pin?
No. The Eaton Bussmann 170M1321 does not include a fuse indicator or striker pin. If blown-fuse detection or signaling is required in your panel design, consider pairing this fuse with an external fuse monitoring relay or selecting an alternate 170M Series variant that includes an integrated indicator. Shansen Enterprises can assist in identifying the correct variant for your application.
How do I order the Eaton Bussmann 170M1321 from Shansen Enterprises?
You can request a quote for the Eaton Bussmann 170M1321 by clicking the WhatsApp button on this page or by sending an email to Shansen Enterprises with your required quantity, delivery location, and any application details. As an authorized Eaton channel partner based in Coimbatore, we supply genuine Eaton Bussmann products with fast delivery across India. Bulk orders and repeat supply contracts are welcome — contact us for pricing and lead time.
