Description
Overview
The Eaton Bussmann 170M3818D is a high speed square body semiconductor fuse rated at 350 A and 690 V AC, engineered to provide precise, fast-acting overcurrent protection for silicon-controlled rectifiers, IGBTs, power converters, and variable frequency drives. Part of the field-proven Bussmann 170M Series, this fuse conforms to DIN 43620 DIN 1 format with knife blade contacts and meets IEC 60269-4 requirements. Its 200 kA interrupt rating and dual fuse indicator make it a reliable choice for panel builders, OEMs, and system integrators across India who require semiconductor-grade protection in compact industrial enclosures.
Key Features
- 350 A Current Rating — handles high continuous load currents typical in heavy industrial drive panels
- 690 V AC Rated Voltage — suitable for standard industrial three-phase power systems up to 690 V
- 200 kA Breaking Capacity — provides robust fault current interruption to protect downstream semiconductors
- Class aR Rating — current-limiting, fast-acting characteristic specifically designed for semiconductor protection, not general-purpose use
- DIN 43620 DIN 1 Format with Knife Blade Contacts — standardized form factor ensures drop-in compatibility with matching DIN 1 fuse holders and bus bar systems
- Dual Indicator (Type D) — two visible fuse indicators allow quick visual confirmation of fuse operation from multiple vantage points inside a panel
- IEC 60269-4 Compliant — meets international standard for semiconductor protection fuses, accepted by engineers and inspectors globally
- CE Marked and RoHS Compliant — meets European regulatory requirements for equipment exported or used in CE-marked assemblies
- IEC Certified — independently verified performance for confidence in critical protection applications
Technical Specifications
| Specification | Value |
|---|---|
| Catalog Number | 170M3818D |
| Series | Bussmann 170M |
| Amperage Rating | 350 A |
| Rated Voltage AC | 690 V |
| Interrupt Rating | 200 kA |
| Breaking Capacity | 200 kA |
| Fuse Class | Class aR |
| Fuse Type | High Speed Square Body |
| Construction | DIN 43620 DIN 1 format with knife blade contacts |
| Fuse Indicator | Dual Indicator (Type D) |
| Standard | IEC 60269-4 |
| Certifications | IEC Rated |
| Compliances | CE Marked, RoHS Compliant |
| Application | Semiconductor protection, DC common bus, DC drives, power converters, rectifiers, VFDs, soft starters, thyristor stacks |
Applications & Selection Guide
The 170M3818D is specifically rated Class aR, meaning it is engineered exclusively for the protection of power semiconductor devices such as SCRs, diodes, IGBTs, and thyristor stacks. Unlike general-purpose gG fuses, Class aR fuses operate only in the current-limiting range and must always be paired with a backup fuse or circuit breaker for overload protection. This fuse is the correct choice when the primary concern is preventing catastrophic semiconductor failure due to short-circuit fault currents in converter and drive circuits.
Typical applications in Indian industry include variable frequency drives (VFDs) for pumps, compressors, and fans; DC common bus systems in automotive manufacturing and steel rolling mills; rectifier panels in electroplating and chemical processing plants; and soft starters in large motor control centres. The 350 A rating at 690 V makes it well suited for medium to large drive systems where semiconductor replacement costs far exceed fuse costs, making fast and reliable protection economically justified.
When selecting this fuse, confirm that the fuse holder or bus bar assembly is rated for DIN 43620 DIN 1 knife blade contacts and that the I²t let-through values are within the withstand rating of the semiconductors being protected. Shansen Enterprises in Coimbatore can assist engineers and panel builders across India with cross-referencing, I²t coordination data, and compatible fuse holder selection from the Eaton Bussmann range.
Why Buy from Shansen Enterprises?
- Authorized Eaton Channel Partner in Coimbatore — guaranteed genuine Eaton Bussmann products
- 100% genuine products supplied with manufacturer warranty
- Pan-India delivery to all major cities and industrial hubs
- WhatsApp technical support for selection, cross-referencing, and coordination queries
- Competitive bulk pricing for panel builders, OEMs, and system integrators
Compatible Products & Accessories
- Eaton Bussmann 170M Series DIN 1 fuse holders compatible with knife blade contacts
- Eaton Bussmann fuse monitoring and indication relay modules
- DIN 43620 DIN 1 format bus bar adapters and mounting bases
- Backup general-purpose gG fuses for overload protection in series with Class aR fuses
- Eaton Bussmann 170M Series fuses in adjacent current ratings (e.g., 315 A, 400 A) for drive system coordination
- Fuse puller tools rated for knife blade contact fuses
Frequently Asked Questions
What is the difference between a Class aR fuse and a Class gR fuse?
A Class aR fuse, such as the 170M3818D, is a partial-range current-limiting fuse that operates only under short-circuit conditions within its rated current-limiting range. It does not provide overload protection on its own and must be used in conjunction with a backup device for overload coverage. A Class gR fuse is a full-range fuse that provides both overload and short-circuit protection for semiconductor circuits. When specifying protection for VFDs, converters, or thyristor stacks in India, always confirm with the semiconductor manufacturer’s datasheet whether Class aR or gR coordination is required.
Is the 170M3818D suitable for DC bus protection?
Yes. The Eaton Bussmann 170M3818D is listed in its application data for DC common bus and DC drive protection. However, when applying any AC-rated fuse on a DC circuit, you must consult the Eaton Bussmann DC voltage derating tables and application notes for the 170M Series, as DC interruption imposes different demands on the fuse element. Shansen Enterprises can provide the relevant Eaton technical documentation to support your DC application engineering.
What does the Dual Indicator (Type D) mean on this fuse?
The Dual Indicator (Type D) means the 170M3818D is fitted with two separate visual indicators — one on each end or face of the fuse body. When the fuse operates, both indicators are triggered, allowing panel builders and maintenance engineers to identify a blown fuse from multiple angles inside a busy switchgear enclosure without needing to remove the fuse for inspection. This reduces diagnostic time and improves safety during fault finding in industrial drive panels.
What fuse holder is compatible with the 170M3818D?
The 170M3818D is constructed to DIN 43620 DIN 1 format with knife blade contacts. It requires a fuse holder, fuse carrier, or bus bar system that conforms to the DIN 43620 DIN 1 mounting standard and is rated for at least 350 A and 690 V AC. Eaton Bussmann offers a range of matching fuse holders and mounting accessories for the 170M Series. Contact Shansen Enterprises in Coimbatore to confirm the correct holder part number for your panel design before ordering.
Does the 170M3818D carry CE marking and RoHS compliance?
Yes. The Eaton Bussmann 170M3818D is CE marked and RoHS compliant, confirming that it meets relevant European Union safety and environmental directives. This is important for Indian OEMs and panel builders who export equipment to European markets or who supply CE-marked machinery to European-based customers operating plants in India. The fuse is also IEC rated in accordance with IEC 60269-4 for semiconductor protection fuses.
How do I order the Eaton Bussmann 170M3818D from Shansen Enterprises?
You can request a quote for the Eaton Bussmann 170M3818D directly from Shansen Enterprises by clicking the WhatsApp button on this page or by sending an email inquiry with your required quantity and delivery location. Our team in Coimbatore will respond with pricing, availability, and estimated delivery timeline for your location across India. For bulk orders or ongoing panel builder requirements, ask about our volume pricing and scheduled supply arrangements.
