Bussmann 170L-921 Eaton Series...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$1,798.06
Bussmann 170L-921 Eaton Series High-Speed Square Body Fuse, Class aR, 700V/690V

Bussmann 170L-921 Eaton Series High-Speed Square Body Fuse, Class aR, 700V/690V

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Model: 170L9653

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

$1,798.06
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Bussmann 170L-921 Eaton Series High-Speed Square Body Fuse, Class aR, 700V/690V

The Bussmann 170L-921 Eaton series high-speed square body fuse is a Class aR fuse engineered for accompanied semiconductor protection in demanding industrial power systems. Rated 700V under UL standards and 690V under IEC standards, this square body fuse is offered across the family in amperage ratings from 500A to 1000A to match the interrupting requirements of the application. Its high-speed design and Utilization Category aR construction make it well suited for protecting semiconductor devices such as SCRs, diodes, and other power-electronic components in AC power circuits.

Key Features

  • Amperage Range: Available in 500A, 550A, 800A, and 1000A ratings to match circuit protection requirements.
  • Voltage Rating: 700V (UL) / 690V (IEC) for high-voltage semiconductor protection circuits.
  • Class aR High-Speed Design: Utilization Category aR provides accompanied semiconductor protection for power-electronic assemblies.
  • Semiconductor Protection Application: Purpose-built to protect semiconductor devices in industrial power systems.
  • Square Body Construction: Compact square body footprint measuring 95 mm wide x 76 mm high x 168 mm in length/depth.
  • AC Voltage Type: Designed for use in AC power distribution systems.
  • Standard Packaging: Shipped in standard packaging configuration for straightforward handling and stocking.

Certifications & Compliance

  • 700V Voltage Rating Recognized Under UL Standards
  • 690V Voltage Rating Recognized Under IEC Standards

Technical Specifications

  • Voltage Type: AC
  • Product Width: 95 mm
  • Utilization Category: aR (accompanied semiconductor protection)
  • Packaging Type: Standard
  • Product Height: 76 mm
  • Application: semiconductor protection
  • Insulated Metal Gripping Lugs (IMGL): No
  • Compliances: Contact factory
  • Product Length Depth: 168 mm

Typical Applications

  • Semiconductor and Power Electronics Protection
  • Variable Frequency Drives (VFDs) and Rectifier Circuits
  • Industrial Power Distribution Systems
  • High-Speed Circuit Protection for AC Power Systems
  • Motor Drive and Converter Protection

Why Bussmann?

As part of the Eaton Bussmann series, this high-speed square body fuse reflects fuse engineering built to protect sensitive semiconductor equipment under demanding AC power conditions. With voltage ratings recognized under both UL (700V) and IEC (690V) standards and a dedicated Class aR utilization category, Bussmann fuses deliver the accompanied semiconductor protection professionals rely on for industrial power electronics applications.

Manufacturer Resources

Product Specs

Product Group:
Fuses
Class:
Class aR
Voltage Type:
AC
Product Width:
95 mm
Utilization Category:
aR (accompanied semiconductor protection)
Packaging Type:
Standard
Product Type:
Fuse
Product Height:
76 mm
Product Details:
Fuse
Application:
semiconductor protection
Insulated Metal Gripping Lugs Imgl:
No
Product Subgroup:
Other Fuses
Compliances:
Contact factory
Product Length Depth:
168 mm
Department:
Electrical
Fuse Indicator:
Other
Voltage Rating:
700V (UL) / 690V (IEC)
Amperage Rating:
500A - 1000A
Configuration:
Class aR
Standards:
UL, IEC

Bussmann 170L9653 – Frequently Asked Questions

1) Will a Bussmann 170L-921 aR fuse protect my drive against an overload, or only a short circuit?
Class aR is accompanied semiconductor protection, meaning the 170L-921 handles short-circuit and high-fault current only. It is a partial-range device. You still need a separate overload protection element (drive electronic overload, thermal overload relay, or an upstream breaker) in the circuit. If you want a single fuse covering both overload and short circuit on a semiconductor circuit, aR is the wrong utilization category for that job.
2) Can I use the Bussmann 170L-921 fuse on a 690V IEC system?
Yes. The 170L-921 square body fuse carries a 700V rating under UL and 690V under IEC, on AC circuits. So a 690V IEC drive or rectifier panel is within rating. It is specified for AC systems, so do not apply it as a DC rating without manufacturer DC data.
3) What amp ratings does the Bussmann 170L-921 series come in, and what's the part number for each?
Four ratings across the family: 500A is 170L9217, 550A is 170L9218, 800A is 170L9655, and 1000A is 170L9653. All share the same 700V/690V Class aR square body construction, so sizing is purely a matter of the amp rating your semiconductor device and circuit call for.
4) What is the body size of the Bussmann 170L-921 square body fuse, and will it fit my existing holder?
The body measures 95 mm wide, 76 mm high, and 168 mm in length/depth. Square body high-speed fuses mount by bolted blade or flush-end contacts rather than dropping into a clip holder, so check the centre distance and bolt pattern of your existing mounting base against those dimensions before ordering. A square body fuse will not fit a cylindrical or blade-type Class J/T holder.
5) Is a Class aR high-speed fuse the right choice for a VFD, or should I use a standard Class J?
For protecting the semiconductor stack itself, the aR high-speed fuse is what the job calls for. The 170L-921 is purpose-built for semiconductor protection, meaning it clears fast enough to save SCRs, diodes, and rectifier bridges that a conventional branch-circuit fuse would let cook. A standard industrial fuse protects the conductor and the enclosure, not the silicon. Common practice on a drive is both: branch-circuit protection ahead of the drive, high-speed aR fuses on the DC link or rectifier input where the manufacturer calls for them.
6) Does the Bussmann 170L-921 come with insulated metal gripping lugs?
No. The 170L-921 is built without IMGL (insulated metal gripping lugs). If your panel standard requires insulated gripping lugs for touch-safe handling during replacement, you need a different variant of the square body line. Plan on de-energizing and using standard safe work practice when swapping this one out.
7) Which standards is the Bussmann 170L-921 fuse recognized under?
It carries ratings under both UL and IEC standards, 700V on the UL side and 690V on the IEC side. That dual recognition is what lets the same fuse be specified on North American equipment and on European-built drives and rectifier panels. For any further compliance documentation beyond those voltage recognitions, Eaton directs the request to the factory.
8) Does this Bussmann fuse have a blown-fuse indicator or a microswitch option?
The 170L-921 is catalogued with an indicator type of Other rather than a standard striker or microswitch pin. If your panel relies on a mechanical striker to trip a shunt or signal a blown fuse to the PLC, verify the indicator arrangement on the specific amp rating you are ordering before you build the alarm circuit around it.
How fast can I get the Bussmann 170L9653 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 170L9653 come with a warranty?
Absolutely. The Bussmann 170L9653 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 170L9653?
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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