Bussmann 170M5308 Eaton Series...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$1,313.30
Image coming soon

Bussmann 170M5308 Eaton Series High-Speed Square Body Fuse, Class aR, 400A

(No reviews yet) Write a Review

Model: 170M5308

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

$1,313.30
Adding to cart… The item has been added
Free Shipping on orders over $199
We price match and offer bulk discounts! Click Add to Quote. It's quick and easy.
✨
Earn points with this purchase! You can redeem points for giftcards, iPads, XBox's and more. View Rewards
Free Keying on all locks
You may also like

Bussmann 170M5308 Eaton Series High-Speed Square Body Fuse, Class aR, 400A

The Bussmann 170M5308 is an Eaton series high-speed square body fuse engineered for semiconductor protection, rated 700V (UL) and 690V (IEC) with a 400A amperage rating and 200 kAIC interrupt capacity. Built as a Class aR fuse for accompanied semiconductor protection (utilization category aR), it features a square body design with slotted, center-bolted tags for a secure connection in demanding power electronics circuits. This high-speed fuse is designed to work in coordination with semiconductor devices, providing precise let-through protection where standard fuses cannot respond quickly enough.

Key Features

  • Amperage Rating: 400A rating supports high-current semiconductor protection applications.
  • Voltage Rating: Rated 700V (UL) and 690V (IEC) for use across UL and IEC-rated systems.
  • Interrupt Rating: 200 kAIC interrupt capacity for reliable performance under high fault-current conditions.
  • Fuse Shape: Square body construction with slotted, center-bolted tags for a secure, low-resistance connection.
  • Utilization Category: Class aR, providing accompanied semiconductor protection where coordinated backup protection is required.
  • Clearing Characteristics: Pre-arc I2t of 11000 and clearing I2t of 74000 at 660V for precise let-through coordination with semiconductor devices.
  • Watt Losses: Rated at 65W.

Certifications & Compliance

  • IEC Rated
  • CE Marked

Technical Specifications

  • Amperage Rating: 400 A
  • Application: semiconductor protection
  • Certifications: IEC Rated
  • Clearing I2t: 74000 at 660 V
  • Compliances: CE Marked
  • Fuse Shape: Square body, slotted center bolted tags
  • Insulated Metal Gripping Lugs (IMGL): No
  • Packaging Type: Standard
  • Pre Arc I2t: 11000
  • Product Height: 80 mm
  • Product Length/Depth: 210 mm
  • Product Weight: 656.6666667 g
  • Product Width: 160 mm
  • Utilization Category: aR (accompanied semiconductor protection)
  • Voltage Rating: 690 V
  • Voltage Type: AC
  • Watt Losses: 65 W

Typical Applications

  • Semiconductor Protection Circuits
  • Power Electronics and Variable Frequency Drives
  • High Fault-Current Industrial Systems
  • Coordinated Backup Fuse Protection
  • Panelboard and Switchgear Protection

Why Bussmann?

Bussmann by Eaton engineers Class aR high-speed fuses for the demanding coordination requirements of semiconductor protection, backed by IEC ratings and CE marking for compliant, code-conscious installations. With a 200 kAIC interrupt rating and precise pre-arc and clearing I2t characteristics, the 170M5308 delivers dependable, coordinated circuit protection for professional power electronics applications.

Manufacturer Resources

Product Specs

Amperage Rating:
400 A
Application:
semiconductor protection
Certifications:
IEC Rated
Class:
Class aR
Clearing I2t:
74000 at 660 V
Compliances:
CE Marked
Fuse Indicator:
Other
Fuse Shape:
Square body, slotted center bolted tags
Insulated Metal Gripping Lugs Imgl:
No
Interrupt Rating:
200 kAIC
Packaging Type:
Standard
Pre Arc I2t:
11000
Product Height:
80 mm
Product Length Depth:
210 mm
Product Weight:
656.6666667 g
Product Width:
160 mm
Utilization Category:
aR (accompanied semiconductor protection)
Voltage Rating:
690 V
Voltage Type:
AC
Watt Losses:
65 W
Product Group:
Fuses
Department:
Electrical
Product Subgroup:
Other Fuses
Product Type:
Fuse
Product Details:
Fuse

Bussmann 170M5308 – Frequently Asked Questions

1) Can the Bussmann 170M5308 be used as the only overcurrent protection for a drive, or does it need a backup device?
It needs a backup. The 170M5308 is a Class aR fuse, utilization category aR meaning accompanied semiconductor protection. An aR fuse only clears short circuit faults; it does not protect against sustained overloads. You still need a separate overload device (breaker, overload relay, or drive electronic protection) upstream or in the drive itself. If you want a fuse that handles both overload and short circuit on its own, you are looking for a gR or gS type instead.
2) What voltage systems is the 400A Bussmann 170M5308 high-speed fuse rated for?
700V on the UL rating and 690V on the IEC rating, AC only. That covers typical 480V and 600V industrial drive and rectifier circuits as well as 690V IEC installations. Do not apply it on DC circuits, the rating stated here is AC.
3) Will the Bussmann 170M5308 fit my existing fuse holder, and how does it mount?
It is a square body fuse with slotted, center-bolted tags, so it bolts directly to busbar or fuse base pads rather than clipping into a ferrule holder. Overall size is 210 mm long, 160 mm wide and 80 mm high, and it weighs about 657 g. Check your mounting centers and the panel clearance against those numbers before ordering, since square body sizes are not interchangeable across frames.
4) What I2t values do I need to coordinate this fuse with my SCRs or diodes?
Pre-arc I2t is 11,000 A2s and total clearing I2t is 74,000 A2s at 660V. To protect the semiconductor, the device's own I2t withstand rating must exceed the fuse clearing I2t at your applied voltage. Compare the 74,000 figure against the SCR or diode datasheet; if the device rating is lower, you need a smaller amp rating fuse.
5) How much heat does the 170M5308 put into the enclosure?
Watt loss is 65 W at rated current. On a 400A high-speed fuse that is real heat, so for multiple fuses in one enclosure add up the losses and size ventilation or cooling accordingly. Restricted airflow around the fuse body also means you may need to derate the current rating per the application guidance for the enclosure.
6) Can I use a standard Class J or Class T 400A fuse instead of this high-speed semiconductor fuse?
Not for semiconductor protection. Standard branch circuit fuses clear far slower and let through much more energy than a power electronics device can survive. The 170M5308 is built specifically for semiconductor protection, with a pre-arc I2t of 11,000 and clearing I2t of 74,000 at 660V, which is what keeps SCRs and diodes intact during a fault. Use conventional fuses for feeder and branch circuits, not across a rectifier bridge or drive input stage.
7) Does the 170M5308 meet IEC requirements for European or export equipment builds?
It carries IEC ratings and is CE marked, with the 690V IEC voltage rating, so it suits machinery built to IEC standards or destined for export. The same part also carries a 700V UL rating for North American installations, which makes it usable on dual-market panel designs.
8) Does the Bussmann 170M5308 have a microswitch indicator or insulated gripping lugs?
No insulated metal gripping lugs on this version. The fuse indicator is listed as other, so if your panel design needs a specific striker pin or microswitch blown-fuse signal for remote monitoring, verify the indicator style matches your fuse monitoring hardware before you standardize on it.
9) What is the exact part number to order for a 400A Bussmann square body semiconductor fuse?
Bussmann by Eaton part number 170M5308. That is the full manufacturer designation for the 400A, 690V IEC / 700V UL square body aR high-speed fuse. It ships in standard packaging.
How fast can I get the Bussmann 170M5308 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 170M5308 come with a warranty?
Absolutely. The Bussmann 170M5308 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 170M5308?
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
Why buy the Bussmann 170M5308 from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.
!