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Bussmann 170M4742 Class aR Square Body Fuse, 350A, 1000V
The Bussmann 170M4742 is a 350A Class aR high-speed square body fuse rated 1000V, engineered for demanding DC power protection where fast semiconductor-grade clearing is critical. Built in the US-style square body configuration with -FKE/115 type K micro indicator styling, this fuse is UL Recognized and CE Marked, and is commonly specified for DC common bus, DC drives, power converters/rectifiers, and reduced voltage starter applications. With a 100 kAIC interrupt rating and dual-voltage clearing I²t performance, it delivers reliable overcurrent protection for industrial power electronics.
Key Features
- Amperage Rating: 350A for robust protection of high-current DC circuits.
- Class aR (High Speed): square body US style construction suited to semiconductor and power converter protection.
- Voltage Rating: 1000V, with clearing I²t of 125,000 A²s at 1000V and 165,000 A²s at 1250V for dual-voltage duty.
- Interrupt Rating: 100 kAIC for dependable performance under high fault-current conditions.
- Pre-Arc I²t: 20,000 A²s for predictable, coordinated fast-clearing response.
- Watt Loss: 70W rated power dissipation.
- Fuse Indicator: Non-Indicating body style.
- Type -FKE/115: type K indicator styling for micro-switch compatible applications.
Certifications & Compliance
- UL Recognized
- CE Marked
Technical Specifications
- Amperage Rating: 350 A
- Application: DC common bus, DC drives, power converters/rectifiers, reduced voltage starters
- Certifications: UL Recognized
- Class: Class aR
- Clearing I2t: 125000 at 1000 V, 165000 at 1250 V
- Compliances: CE Marked
- Fuse Indicator: Non Indicating
- Interrupt Rating: 100 kAIC
- Packaging Type: Standard
- Pre Arc I2t: 20000
- Product Height: .001 mm
- Product Length Depth: .001 mm
- Product Weight: .001 g
- Product Width: .001 mm
- Voltage Rating: 1000 V
- Watt Losses: 70 W
- Product Type: Square body US style, -FKE/115 type K indicator for micro
- Product Details: Square body US style, -FKE/115 type K indicator for micro
Typical Applications
- DC Common Bus Protection
- DC Drives
- Power Converters and Rectifiers
- Reduced Voltage Starters
- Industrial Power Electronics and Distribution
Why Bussmann?
Bussmann engineers its Class aR square body fuses for the fast-clearing, high-interrupt performance that semiconductor and DC power circuits demand. With a 100 kAIC interrupt rating, dual-voltage clearing I²t data, and UL Recognized, CE Marked construction, the 170M4742 supports code-compliant, reliable overcurrent protection for professional industrial electrical work.
Manufacturer Resources
Product Specs
- Amperage Rating:
- 350 A
- Certifications:
- UL Recognized
- Class:
- Class aR
- Clearing I2t:
- 125000 at 1000 V, 165000 at 1250 V
- Compliances:
- CE Marked
- Fuse Indicator:
- Non Indicating
- Interrupt Rating:
- 100 kAIC
- Packaging Type:
- Standard
- Pre Arc I2t:
- 20000
- Product Height:
- .001 mm
- Product Length Depth:
- .001 mm
- Product Weight:
- .001 g
- Product Width:
- .001 mm
- Voltage Rating:
- 1000 V
- Watt Losses:
- 70 W
- Product Group:
- Fuses
- Department:
- Electrical
- Product Subgroup:
- Square Body Fuses
- Product Type:
- Fuse