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Bussmann 170M3766 High-Speed Square Body Fuse, Class aR, 250A/690V
The Bussmann 170M3766 is an Eaton Bussmann series high speed square body fuse engineered for semiconductor protection in demanding power electronics applications. Rated 700V (UL) / 690V (IEC) at 250A with a 200kAIC interrupt rating, this Class aR fuse is built with a blade end X blade end square body configuration for accompanied semiconductor protection duty. Backed by IEC ratings and CE marking, it delivers the fast-clearing performance required to safeguard sensitive power semiconductors from short-circuit fault currents.
Key Features
- Amperage Rating: 250A for high-current semiconductor circuit protection.
- Voltage Rating: 700V (UL) / 690V (IEC) for use across UL and IEC-rated systems.
- Interrupt Rating: 200 kAIC high speed fuse for reliable clearing of high fault currents.
- Utilization Category: Class aR (accompanied semiconductor protection) rather than full-range protection.
- Fuse Shape: Square body, center bolted tags with blade end X blade end termination.
- Clearing I²t: 28500 at 660V for predictable let-through energy during fault clearing.
- Pre-Arc I²t: 4200 for coordinated protection with upstream/downstream devices.
- Watt Losses: 40W rated power dissipation.
Certifications & Compliance
- IEC Rated
- CE Marked
Technical Specifications
- Amperage Rating: 250 A
- Application: semiconductor protection
- Certifications: IEC Rated
- Clearing I2t: 28500 at 660 V
- Compliances: CE Marked
- Fuse Shape: Square body, center bolted tags
- Insulated Metal Gripping Lugs (IMGL): No
- Packaging Type: Standard
- Pre Arc I2t: 4200
- Product Height: 60 mm
- Product Length/Depth: 92 mm
- Product Weight: 176 g
- Product Width: 163 mm
- Utilization Category: aR (accompanied semiconductor protection)
- Voltage Rating: 690 V
- Voltage Type: AC
- Watt Losses: 40 W
Typical Applications
- Semiconductor and Power Electronics Protection
- Variable Frequency Drives and Motor Drive Circuits
- Rectifier and Converter Protection
- Industrial and Commercial Power Distribution
- Accompanied Short-Circuit Protection for Solid-State Devices
Why Bussmann?
Bussmann by Eaton is a recognized name in circuit protection, and the 170M3766 reflects that engineering standard with its IEC-rated, CE-marked construction and a defined 200kAIC interrupt rating for demanding semiconductor protection duty. The square body, center bolted tag design with blade end X blade end termination supports dependable installation in high-speed fuse applications. For professionals specifying Class aR accompanied semiconductor protection, the 170M3766 delivers the documented clearing I²t and pre-arc I²t performance needed for coordinated, code-compliant power electronics protection.
Manufacturer Resources
Product Specs
- Amperage Rating:
- 250 A
- Application:
- semiconductor protection
- Certifications:
- IEC Rated
- Class:
- Class aR
- Clearing I2t:
- 28500 at 660 V
- Compliances:
- CE Marked
- Connection:
- Blade end x blade end
- Fuse Indicator:
- Other
- Fuse Shape:
- Square body, center bolted tags
- Insulated Metal Gripping Lugs Imgl:
- No
- Interrupt Rating:
- 200 kAIC
- Packaging Type:
- Standard
- Pre Arc I2t:
- 4200
- Product Height:
- 60 mm
- Product Length Depth:
- 92 mm
- Product Weight:
- 176 g
- Product Width:
- 163 mm
- Utilization Category:
- aR (accompanied semiconductor protection)
- Voltage Rating:
- 690 V
- Voltage Type:
- AC
- Watt Losses:
- 40 W
- Product Group:
- Fuses
- Department:
- Electrical
- Product Subgroup:
- Other Fuses
- Product Type:
- Fuse
- Product Details:
- Fuse