Description
Overview
The Eaton Bussmann 140EET is a High Speed British Standard single barrel semiconductor protection fuse from the Bussmann EET series, rated at 140A and 690V AC (450V DC) with an exceptional 200 kA breaking capacity. Classified as Class aR under BS88 Part 4 / IEC 60269-4, it is engineered specifically to protect power semiconductor devices — including thyristors, diodes, IGBTs, and SCRs — from damaging fault currents with the ultra-fast clearing times these components demand. The integrated top indicator provides immediate visual fault confirmation, streamlining maintenance and minimising downtime in critical industrial power systems.
Key Features
- High Speed Class aR Performance — Ultra-fast arc interruption protects sensitive semiconductor junctions before I²t damage occurs.
- 140A Current Rating — Suitable for medium-power semiconductor drive and converter circuits across a wide range of industrial applications.
- 690V AC / 450V DC Rated Voltage — Covers standard three-phase 415V and 690V AC systems as well as DC bus applications up to 450V.
- 200 kA Breaking Capacity — Handles the highest available fault currents found in industrial switchgear and motor control centres.
- BS88 Part 4 / IEC 60269-4 Compliance — Conforms to internationally recognised standards for high speed semiconductor protection fuses.
- Single Barrel Construction — Compact form factor simplifies panel layout and reduces mounting footprint in drive enclosures and converter cabinets.
- Top-Mounted Indicator — Provides instant visual confirmation of fuse operation without the need to remove the fuse from its holder, reducing maintenance time.
- CE Marked & RoHS Compliant — Ready for use in CE-marked equipment and compliant with European hazardous substance restrictions.
- IEC Rated & UL Recognized — Dual certification supports both domestic Indian industrial projects and export-oriented OEM equipment.
Technical Specifications
| Specification | Value |
|---|---|
| Catalog Number | 140EET |
| Series | Bussmann EET |
| Amperage Rating | 140 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 Single Barrel |
| Standard | BS88 Part 4, IEC 60269-4 |
| Fuse Indicator | Top Indicator |
| 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 140EET is purpose-built for semiconductor protection in power electronics circuits where conventional gG or gM fuses are too slow to prevent device destruction. In variable frequency drives (VFDs) and DC drives, fault currents can rise at rates that destroy IGBT and thyristor junctions in microseconds — the Class aR rating of this fuse ensures it clears the fault within the I²t withstand limits of the protected device. It is equally effective in rectifier bridges, soft starters, thyristor stacks, and DC common bus systems where both AC-side and DC-side protection are required simultaneously.
The 690V AC and 450V DC dual voltage rating makes the 140EET versatile for Indian industrial installations operating on 415V three-phase systems (with adequate voltage margin) as well as true 690V systems increasingly found in large-scale manufacturing, wind energy converters, and process industry drives. The 200 kA breaking capacity ensures suitability even in high-fault-level installations close to large distribution transformers.
In India, this fuse is widely used by panel builders and OEMs in Coimbatore, Chennai, Pune, Ahmedabad, and across the industrial belt for textile machinery drives, pump and compressor VFDs, induction heating power supplies, UPS rectifier sections, and solar inverter DC protection. Engineers specifying semiconductor protection should always verify the fuse I²t let-through value against the semiconductor device’s I²t withstand rating as published in the device datasheet.
Why Buy from Shansen Enterprises?
- Authorized Eaton Channel Partner Coimbatore — supplying genuine Bussmann fuses with full traceability
- 100% genuine products supplied with manufacturer warranty and documentation
- Pan-India delivery to all major industrial cities and tier-2 locations
- WhatsApp technical support for selection, cross-referencing, and application queries
- Bulk pricing and credit terms available for panel builders, OEMs, and EPC contractors
Compatible Products & Accessories
- Eaton Bussmann EET Series Fuse Holders and Fuse Bases (BS88 Part 4 compatible)
- Eaton Bussmann High Speed Semiconductor Fuses — EET Series (other current ratings: 63A, 80A, 100A, 125A, 160A, 200A)
- Eaton Bussmann Remote Fuse Indication Accessories
- Eaton Bussmann DIN Rail Fuse Holders for cylindrical and BS88 semiconductor fuses
- Eaton Bussmann DC Bus Protection Fuses for battery energy storage and solar inverter applications
- Semiconductor Fuse Kits with matching fuse links, holders, and busbars for drive panel assembly
Frequently Asked Questions
What is the difference between Class aR and Class gR semiconductor fuses?
Class aR fuses are partial-range current-limiting fuses designed exclusively for semiconductor protection — they operate only above a defined minimum breaking current and are not intended to carry overload currents continuously at low multiples of rated current. Class gR fuses are full-range semiconductor fuses that can additionally protect cables and conductors in the circuit. The Eaton Bussmann 140EET is Class aR, meaning it must be coordinated with an upstream gG or MCCB for overload and low-level fault protection; the aR fuse handles only the high-speed, high-magnitude fault events that would otherwise destroy the semiconductor device.
Can the 140EET be used for both AC and DC semiconductor protection?
Yes. The 140EET carries a rated voltage of 690V AC and 450V DC, making it suitable for both AC-side protection (for example, on the input of a rectifier bridge or soft starter) and DC-side protection (such as on a DC common bus in a multi-drive system or energy storage installation). Always confirm the system DC bus voltage does not exceed 450V DC before applying this fuse on the DC side.
How does the top indicator on the 140EET work?
The 140EET features a top-mounted striker or microswitch indicator that provides a clear visual signal when the fuse has operated. When the fuse element clears a fault, the indicator pops up or changes state, allowing maintenance personnel to identify a blown fuse immediately without removing it from the holder or using a continuity tester. Some holder designs can also use this indicator to trigger an auxiliary signal for remote alarm or panel annunciation systems.
What fuse holder is compatible with the Eaton Bussmann 140EET?
The 140EET uses a BS88 Part 4 single barrel form factor. Compatible fuse holders and bases from the Eaton Bussmann range designed for the EET series at 140A should be selected. It is important to match the holder’s current rating, voltage rating, and physical dimensions to the fuse. Contact Shansen Enterprises with your installation details and we will confirm the correct holder part number from the Eaton Bussmann catalogue.
Is the 140EET suitable for VFD input and output protection in Indian industrial panels?
The 140EET is suitable for semiconductor protection on the input rectifier side of VFDs operating on 415V or 690V three-phase supplies in India. It is not typically applied on the inverter output side to a motor, as output protection requirements differ. For VFD applications, always cross-check the VFD manufacturer’s recommended fuse I²t value against the 140EET’s published I²t let-through characteristic to confirm coordination. Shansen Enterprises can assist with application-specific fuse selection for drives panels built in Coimbatore and across India.
How do I order the Eaton Bussmann 140EET from Shansen Enterprises?
You can request a quote for the Eaton Bussmann 140EET directly from Shansen Enterprises via WhatsApp or email using the contact buttons on this page. Please share your required quantity, delivery location, and any project-specific requirements. As an authorized Eaton channel partner based in Coimbatore, we supply genuine Bussmann fuses with full documentation and offer pan-India delivery. Bulk orders and repeat purchase agreements with preferential pricing are available for panel builders, OEMs, and industrial procurement teams.
