Bussmann 170M8609 Eaton Series...
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Bussmann 170M8609 Eaton Series High-Speed Square Body Fuse, 900A Class aR, 1000V

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Model: 170M8609

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

$2,140.46
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Bussmann 170M8609 Eaton Series High-Speed Square Body Fuse, 900A Class aR, 1000V

The Bussmann 170M8609 is an Eaton series high-speed square body fuse engineered for semiconductor protection in demanding industrial power circuits. Rated 900A at 1000V AC with a 150 kAIC interrupt rating, this Class aR fuse features a square body design with flush end contacts for compact, high-density mounting. Its aR utilization category classifies it as an accompanied semiconductor protection fuse, built to safeguard sensitive power electronics from short-circuit and overcurrent conditions.

Key Features

  • Amperage Rating: 900A for high-current semiconductor circuit protection.
  • Voltage Rating: 1000V AC for use in high-voltage power conversion systems.
  • Interrupt Rating: 150 kAIC, with a clearing I2t of 150,000 at 1000V for reliable fault clearing.
  • Pre-Arc I2t: 250,000 for precise coordination with protected semiconductor devices.
  • Utilization Category: Class aR (accompanied semiconductor protection) for partial-range backup protection.
  • Fuse Shape: Square body construction with flush end contacts for compact bus-bar mounting.
  • Watt Losses: 145W rated power dissipation.
  • Application: Purpose-built for semiconductor protection in power electronics equipment.

Certifications & Compliance

  • IEC Rated
  • CE Marked

Technical Specifications

  • Amperage Rating: 900 A
  • Application: semiconductor protection
  • Certifications: IEC Rated
  • Clearing I2t: 150000 at 1000 V
  • Compliances: CE Marked
  • Fuse Shape: Square body, flush end contacts
  • Insulated Metal Gripping Lugs (Imgl): No
  • Packaging Type: Standard
  • Pre Arc I2t: 250000
  • Product Height: 76 mm
  • Product Length Depth: 168 mm
  • Product Weight: 705.5 g
  • Product Width: 95 mm
  • Utilization Category: aR (accompanied semiconductor protection)
  • Voltage Rating: 1000 V
  • Voltage Type: AC
  • Watt Losses: 145 W

Typical Applications

  • Semiconductor Device Protection
  • Power Electronics and Rectifier Circuits
  • Motor Drive and Power Conversion Equipment
  • Industrial Power Distribution Systems
  • Renewable Energy and Power Conversion Installations

Why Bussmann?

Bussmann by Eaton is a trusted name in circuit protection, and the 170M8609 reflects that standard with its IEC-rated, CE-marked construction and a clearly defined 900A, 1000V, 150 kAIC performance envelope. The Class aR square body design with flush end contacts delivers dependable, code-compliant protection for semiconductor devices in professional electrical and industrial power applications.

Manufacturer Resources

Product Specs

Amperage Rating:
900 A
Application:
semiconductor protection
Certifications:
IEC Rated
Class:
Class aR
Clearing I2t:
150000 at 1000 V
Compliances:
CE Marked
Fuse Indicator:
Other
Fuse Shape:
Square body, flush end contacts
Insulated Metal Gripping Lugs Imgl:
No
Interrupt Rating:
150 kAIC
Mounting Method:
Flush
Packaging Type:
Standard
Pre Arc I2t:
250000
Product Height:
76 mm
Product Length Depth:
168 mm
Product Weight:
705.5 g
Product Width:
95 mm
Utilization Category:
aR (accompanied semiconductor protection)
Voltage Rating:
1000 V
Voltage Type:
AC
Watt Losses:
145 W
Product Group:
Fuses
Department:
Electrical
Product Subgroup:
Other Fuses
Product Type:
Fuse
Product Details:
Fuse

Bussmann 170M8609 – Frequently Asked Questions

1) Will the Bussmann 170M8609 protect a semiconductor rectifier on its own, or do I still need an upstream device?
The 170M8609 is an aR fuse, accompanied semiconductor protection, which is partial-range. It clears short circuits and high overcurrents on the semiconductor side but is not intended to cover low-level overloads across the full range. Keep an upstream overload protective device or drive-level current limiting in the circuit and use the 170M8609 for the fault-clearing duty. If you need full-range protection in one device, an aR fuse is the wrong utilization category for that job.
2) What I2t values do I use to coordinate the 170M8609 with my SCR or diode?
Two figures matter for that check. Pre-arc (melting) I2t is 250,000 and clearing I2t is 150,000 at 1000V. Compare the clearing I2t against the I2t withstand of the SCR or diode you are protecting: the device rating has to exceed the fuse clearing value for the fuse to save it. The pre-arc number is what you use when coordinating with another fuse in series so the intended one melts first.
3) What part number do I order to replace a blown 900A square body fuse in an Eaton 170M rectifier stack?
The Bussmann by Eaton part is 170M8609, a single non-variant item. Match it on all four numbers before you swap: 900A, 1000V AC, 150 kAIC, and aR class. A 170M fuse with the same amp rating but a different voltage or a different utilization category will physically bolt in and still be the wrong protection for the semiconductors behind it.
4) How much space and bus-bar room do I need for the Bussmann 170M8609 square body fuse?
Allow for a body measuring 168 x 95 x 76 mm and a weight of 705.5 g. It is a square body fuse with flush end contacts, so it bolts flat to bus bar rather than dropping into clips, and the mounting face is what carries it. At just over 700 grams, plan on the bar or holder taking the full mechanical load, not the conductors.
5) Does the 170M8609 have insulated metal gripping lugs for hot-swap handling?
No. The 170M8609 is built without insulated metal gripping lugs (IMGL). It is a flush end contact version, which is the compact bolt-down style. If your panel standard calls for IMGL lugs so the fuse can be gripped and pulled, you need the IMGL variant of the 170M body instead, not this one.
6) How much heat does a 900A high-speed square body fuse put into the enclosure?
Rated watt loss on the 170M8609 is 145 W at rated current. That is real heat inside the cabinet, so size enclosure ventilation or forced cooling to carry it, and remember the figure applies at full 900A load with proper bus-bar heat sinking. Undersized bar or restricted airflow will push the fuse body above its expected operating temperature and shift its time-current behaviour.
7) Is the Bussmann 170M8609 acceptable for an IEC-specified panel going into Europe?
It is IEC rated and CE marked, which is what an IEC panel build and a European shipment call for. Those are the compliance marks carried on the 170M8609; nothing further is stated, so if your job also demands a North American listing, confirm that separately against the marks on the part.
8) What is the difference between an aR fuse like the 170M8609 and a gR or gS semiconductor fuse?
Utilization category is the whole difference. The 170M8609 is aR, partial range: it interrupts fault currents but expects another device to handle sustained low-level overloads. A gR or gS fuse is full range, clearing everything from small overloads up to maximum fault current, so it can stand alone as both overload and short-circuit protection. Pick aR when a drive, breaker, or thermal device already covers the overload region and you want the lowest possible let-through on a hard fault.
9) Does the 170M8609 come with a blown-fuse indicator or microswitch?
The fuse indicator on the 170M8609 is listed as Other, not as a standard striker or microswitch arrangement, and no signalling accessory is included with it. If your panel relies on remote blown-fuse annunciation, plan that on the indicator arrangement actually fitted to the fuse you receive rather than assuming a striker pin is there to trip a microswitch.
How fast can I get the Bussmann 170M8609 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 170M8609 come with a warranty?
Absolutely. The Bussmann 170M8609 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 170M8609?
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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