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Bussmann 170M3771 High-Speed Fuse-Link, 500A, Class aR
The Bussmann 170M3771 is a high-speed fuse-link engineered for semiconductor protection, rated 500A at AC 690V in a compact size 1 body measuring 45 x 59 x 148 mm. Built to Class aR (accompanied semiconductor protection) utilization category with a 200 kAIC interrupt rating, this fuse-link carries a single indicator and meets IEC and UL requirements, making it well suited for demanding industrial power electronics and power conversion applications where fast, reliable clearing of fault currents protects sensitive semiconductor devices.
Key Features
- Compact Size 1 Body: Measures 45 x 59 x 148 mm, fitting space-constrained semiconductor protection assemblies and drive enclosures.
- High-Speed Fuse-Link: Class aR (accompanied semiconductor protection) design rated 500A for fast-acting overcurrent clearing ahead of downstream semiconductor devices.
- Voltage Rating: Rated AC 690V, supporting demanding industrial power circuits and three-phase equipment.
- Interrupt Rating: 200 kAIC interrupt rating delivers dependable short-circuit protection in high fault-current environments.
- Fuse Construction: Square body with center bolted tags provides secure, low-resistance electrical connections and simplified installation.
- Single Indicator: Built-in single indicator supports quick visual verification of fuse status during maintenance.
- Application-Specific Design: Purpose-built for semiconductor protection duty in power conversion and control equipment.
Certifications & Compliance
- IEC 60269-4 Compliant
- UL Listed
- CE Compliant
Technical Specifications
- Application: Semiconductor protection.
- Certifications: IEC 60269-4.
- Class: Class aR.
- Compliances: CE.
- Fuse Indicator: Other.
- Fuse Shape: Square body, center bolted tags.
- Insulated Metal Gripping Lugs (IMGL): No.
- Interrupt Rating: 200 kAIC.
- Packaging Type: Standard.
- Product Height: 60 mm.
- Product Length Depth: 92 mm.
- Product Weight: 176 g.
- Product Width: 163 mm.
- Utilization Category: aR (accompanied semiconductor protection).
- Voltage Type: AC.
Typical Applications
- Semiconductor Protection in Power Electronics
- Variable Frequency Drives and Motor Controllers
- Industrial Power Conversion Equipment
- High-Speed Overcurrent Protection Circuits
- Compact Panel and Enclosure Fuse Assemblies
Why Bussmann?
Bussmann engineers the 170M3771 to IEC 60269-4 standards with UL and CE compliance, delivering a 200 kAIC interrupt rating and Class aR utilization category for dependable semiconductor protection. The compact size 1 construction, with its square body and center bolted tags, provides a reliable, code-compliant fuse-link built for professional industrial electrical and power conversion work.
Manufacturer Resources
Product Specs
- Amperage Rating:
- 500 A
- Application:
- semiconductor protection
- Certifications:
- IEC 60269-4
- Class:
- Class aR
- Compliances:
- CE
- Fuse Indicator:
- Other
- Fuse Shape:
- Square body, center bolted tags
- Insulated Metal Gripping Lugs Imgl:
- No
- Interrupt Rating:
- 200 kAIC
- Packaging Type:
- Standard
- 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
- Product Group:
- Fuses
- Department:
- Electrical
- Product Subgroup:
- Other Fuses
- Product Type:
- Fuse
- Product Details:
- Fuse
Bussmann 170M3771 – Frequently Asked Questions
1) Can a Bussmann 170M3771 fuse be used as a branch circuit or motor overload fuse?
No. The 170M3771 is a Class aR high-speed fuse-link, and aR means accompanied semiconductor protection: it clears short circuits ahead of diodes, SCRs and IGBTs but does not provide full-range overload protection. It has to be backed up by a separate overload device such as the drive's electronic overload or an upstream branch circuit protective device. If you need standalone branch protection, use a Class J, RK5 or similar general purpose fuse instead.
2) Will a 500A 690V fuse like the 170M3771 work on a 480V drive?
Yes. The 170M3771 is rated AC 690 V, and a fuse may be applied at or below its voltage rating, so a 480 V AC system is within range. What you cannot do is use it on DC or above 690 V AC: it carries an AC rating only.
3) How does the Bussmann 170M3771 mount into a fuse holder or busbar?
It is a square body with center bolted tags, so it bolts directly to busbar or to a bolt-in base rather than dropping into clips. Plan your bar spacing and bolt prep around the body: 163 mm wide, 92 mm deep, 60 mm high. It does not have insulated metal gripping lugs, so allow for creepage and clearance at the tags in the enclosure.
4) What does the Bussmann 170M3771 actually protect in a VFD or rectifier?
It goes ahead of the semiconductors, the diode bridge, SCR stack or IGBT module, in variable frequency drives, motor controllers and power conversion equipment. Its job is to clear a device short fast enough to limit let-through energy before the silicon ruptures. Sizing is against the semiconductor's I2t withstand, not against motor full load amps, so match the 500 A rating to the manufacturer's recommended fuse for the stack.
5) Is a 200 kAIC fuse enough for my switchgear's available fault current?
The 170M3771 interrupts 200 kA, which covers the large majority of industrial service points. Compare it against the calculated available fault current at the point of installation on your short circuit study; if that number is at or below 200 kA at 690 V AC or less, this fuse is adequate for the interrupting duty.
6) What standards does the Bussmann 170M3771 semiconductor fuse meet?
It is built to IEC 60269-4, the standard for fuse-links protecting semiconductor devices, and it is CE compliant. That is the specification most drive and rectifier manufacturers cite when they call out a high-speed fuse on the one-line.
7) Does the Bussmann 170M3771 have a blown fuse indicator for a microswitch?
It is built with an indicator for visual verification of fuse status during maintenance. The listed indicator type is a non-standard variant rather than a plain striker, so if you are driving a remote alarm contact, confirm the microswitch accessory is matched to this body before wiring the trip circuit.
8) How heavy is the 170M3771 and does it need support in the panel?
At 176 g the fuse-link is light enough to be carried by its bolted tags alone, so no separate bracket is required. Torque both center bolted connections to the equipment manufacturer's figure, since a loose joint on a 500 A path will overheat well before the fuse ever sees a fault.
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Does the Bussmann 170M3771 come with a warranty?
Absolutely. The Bussmann 170M3771 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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