Bussmann 170M6277 Eaton Series...
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Bussmann 170M6277 Eaton Series High-Speed Square Body Fuse, Class aR, 1000A

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Model: 170M6277

In Stock (leaves warehouse same day if ordered before 3pm ET)

$2,960.78
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Bussmann 170M6277 Eaton Series High-Speed Square Body Fuse, Class aR, 1000A

The Bussmann 170M6277 is an Eaton Bussmann series high-speed square body fuse engineered for demanding semiconductor protection applications. Rated 550V (UL) and 690V (IEC) with a 1000A amperage rating and a 100 kAIC interrupt rating, this Class aR fuse is designed to provide accompanied semiconductor protection in industrial power circuits. Its square body construction with special bladed contacts supports high fault-current interruption in compact, high-performance fuse assemblies built for professional power distribution equipment.

Key Features

  • Amperage Rating: 1000A rating for high-current semiconductor protection circuits.
  • Voltage Rating: 550V (UL) and 690V (IEC) for use across UL- and IEC-rated systems.
  • Interrupt Rating: 100 kAIC for reliable clearing of high fault currents.
  • Utilization Category: Class aR, providing accompanied semiconductor protection.
  • Fuse Shape: Square body with special bladed contacts for secure, high-current connections.
  • Application: Designed specifically for semiconductor protection duty.
  • Voltage Type: AC-rated for alternating current power systems.

Certifications & Compliance

  • Rated to UL Standards at 550V
  • Rated to IEC Standards at 690V
  • Contact factory for additional compliance documentation

Technical Specifications

  • Amperage Rating: 1000 A
  • Application: semiconductor protection
  • Compliances: Contact factory
  • Fuse Shape: Square body, special bladed contacts
  • Insulated Metal Gripping Lugs (IMGL): No
  • Packaging Type: Standard
  • Product Height: 74 mm
  • Product Length Depth: 90 mm
  • Product Weight: 2800 g
  • Product Width: 160 mm
  • Utilization Category: aR (accompanied semiconductor protection)
  • Voltage Rating: 1100 V
  • Voltage Type: AC

Typical Applications

  • Semiconductor Device Protection
  • High-Speed Fuse Applications Requiring Class aR Protection
  • Industrial Power Systems and Equipment
  • Circuits Requiring 1000A, 100 kAIC Interrupt Capacity
  • UL- and IEC-Rated Power Distribution Systems

Why Bussmann?

Bussmann by Eaton is a recognized name in circuit protection, and the 170M6277 square body fuse reflects that standard with its Class aR utilization category, 100 kAIC interrupt rating, and dual UL/IEC voltage ratings. Built for accompanied semiconductor protection, it delivers dependable performance for professional industrial electrical work where high-current, high-speed fuse protection is essential to system reliability and equipment uptime.

Manufacturer Resources

Product Specs

Amperage Rating:
1000 A
Application:
semiconductor protection
Class:
Class aR
Compliances:
Contact factory
Fuse Indicator:
Other
Fuse Shape:
Square body, special bladed contacts
Insulated Metal Gripping Lugs Imgl:
No
Interrupt Rating:
100 kAIC
Packaging Type:
Standard
Product Height:
74 mm
Product Length Depth:
90 mm
Product Weight:
2800 g
Product Width:
160 mm
Utilization Category:
aR (accompanied semiconductor protection)
Voltage Rating:
1100 V
Voltage Type:
AC
Product Group:
Fuses
Department:
Electrical
Product Subgroup:
Other Fuses
Product Type:
Fuse
Product Details:
Fuse

Bussmann 170M6277 – Frequently Asked Questions

1) Will the Bussmann 170M6277 protect a semiconductor drive, or is it a general branch circuit fuse?
It is a semiconductor protection fuse, not a branch circuit fuse. The 170M6277 carries utilization category aR, which is accompanied semiconductor protection: it clears short circuits ahead of diodes, SCRs and IGBT modules but does not provide overload protection on its own. You still need a separate overload device (motor overload relay, drive electronics, or a conventional fuse) in the circuit. If you are fusing a feeder, panelboard, or motor branch, this is the wrong class of fuse.
2) What voltage can I use the Bussmann 170M6277 1000A fuse at on a UL job versus an IEC job?
The 170M6277 is rated 550V under UL and 690V under IEC, both AC. Same fuse, different standard, different ceiling, so a panel built to UL in North America is limited to 550V even though the IEC figure is higher. Don't apply the 690V number to UL-listed equipment.
3) How does the 170M6277 mount - is it a bolt-in or a clip-in fuse?
Square body with special bladed contacts. That means it bolts into the fuse blades or busbar landing pads rather than clipping into spring ferrule clips like a cylindrical cartridge fuse. You need a matching square body holder or a drilled busbar arrangement; it will not drop into a standard Class J or Class T block.
4) Does the Bussmann 170M6277 come with insulated metal gripping lugs?
No. The 170M6277 is supplied without IMGL. If your application calls for insulated gripping lugs for touch safety or for cable termination directly at the fuse, you need a different variant in the 170M family that specifies IMGL.
5) What exact part number do I order for the Bussmann 1000A Class aR square body fuse?
Order Bussmann 170M6277. That single manufacturer part number covers the 1000A Class aR square body configuration, supplied in standard packaging. The 170M prefix is the Eaton Bussmann high-speed square body series, and the digits after it fix the body size, amperage, and contact style, so substituting a nearby 170M number is not a like-for-like swap.
6) Can I use this 1000A high-speed fuse on a DC bus?
The published rating on the 170M6277 is AC. DC application of a high-speed fuse requires a separate DC voltage and time-constant rating, which is not part of this fuse's stated rating, so specify it for AC circuits.
How fast can I get the Bussmann 170M6277 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Bussmann 170M6277 come with a warranty?
Absolutely. The Bussmann 170M6277 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Bussmann 170M6277?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
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