Bussmann 170M4218 Eaton Series...
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Bussmann 170M4218 Eaton Series High Speed Square Body Fuse, 800A Class aR

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Model: 170M4218

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

$1,380.14
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Bussmann 170M4218 Eaton Series High Speed Square Body Fuse, 800A Class aR

The Bussmann 170M4218 is an Eaton Bussmann series high speed square body fuse engineered for demanding semiconductor protection duty, rated 1250V (IEC) / 1300V (UL), 800A, with a 200 kAIC interrupting rating and a 690V AC voltage rating. Built on a square body platform with blade end X blade end terminals per DIN 43 620 and classified aR (accompanied semiconductor protection), this fuse is intended for power electronics and industrial circuits where fast, reliable clearing under high fault currents is critical. A top-mounted fuse status indicator gives maintenance personnel quick visual confirmation of fuse condition without removing the device from service.

Key Features

  • Voltage Rating: 1250V (IEC), 1300V (UL) construction with a 690 V AC voltage rating for demanding power circuits.
  • Amperage Rating: 800A current rating sized for high-power industrial and semiconductor protection applications.
  • Interrupting Rating: 200 kAIC short-circuit current rating for reliable performance under high fault-current conditions.
  • Connection Style: Blade end X blade end terminals built to the DIN 43 620 standard for secure, high-current termination.
  • Fuse Shape: Square body design with slotted center bolted tags for a robust mechanical and electrical connection.
  • Status Indicator: Top fuse status indicator provides at-a-glance confirmation of fuse condition.
  • Utilization Category: Class aR (accompanied semiconductor protection) for use alongside semiconductor devices.
  • Clearing Characteristics: Pre-Arc I2t of 52000 and Clearing I2t of 850000 at 660 V, with a Clearing Loss of 95.

Certifications & Compliance

  • IEC Rated
  • CE Marked

Technical Specifications

  • Amperage Rating: 800 A
  • Application: semiconductor protection
  • Certifications: IEC Rated
  • Clearing I2t: 850000 at 660 V
  • Clearing Loss: 95
  • Compliances: CE Marked
  • Fuse Shape: Square body, slotted center bolted tags
  • Insulated Metal Gripping Lugs (IMGL): No
  • Packaging Type: Standard
  • Pre Arc I2t: 52000
  • Product Height: 62 mm
  • Product Length Depth: 245 mm
  • Product Weight: 499 g
  • Product Width: 142 mm
  • Utilization Category: aR (accompanied semiconductor protection)
  • Voltage Rating: 690 V
  • Voltage Type: AC

Typical Applications

  • Semiconductor Device Protection
  • High-Power Industrial Circuits
  • Motor Drive and Power Conversion Equipment
  • Industrial Switchgear and Power Distribution

Why Bussmann?

The Bussmann 170M4218 delivers the fast-clearing, high-interrupting-capacity performance that Eaton Bussmann series fuses are known for, backed by IEC rating and CE marking for compliant use in demanding industrial installations. Its square body construction, DIN 43 620 blade end terminals, and top fuse status indicator make it a dependable choice for engineers specifying accompanied semiconductor protection in high-current power electronics.

Manufacturer Resources

Product Specs

Amperage Rating:
800 A
Application:
semiconductor protection
Certifications:
IEC Rated
Class:
Class aR
Clearing I2t:
850000 at 660 V
Clearing Loss:
95
Compliances:
CE Marked
Connection:
Blade end x blade end
Fuse Indicator:
Top fuse status indicator
Fuse Shape:
Square body, slotted center bolted tags
Insulated Metal Gripping Lugs Imgl:
No
Interrupt Rating:
200 kAIC
Mounting Method:
DIN 43 620
Packaging Type:
Standard
Pre Arc I2t:
52000
Product Height:
62 mm
Product Length Depth:
245 mm
Product Weight:
499 g
Product Width:
142 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 170M4218 – Frequently Asked Questions

1) Will the Bussmann 170M4218 protect the semiconductors in my drive, or do I still need a separate branch circuit fuse?
Class aR is accompanied semiconductor protection, which means the 170M4218 clears short circuits only. It does not provide overload protection, so the circuit still needs a separate overload device (breaker or overload relay) upstream or in the drive control. Use it where fast clearing on a hard fault is what protects the diodes, IGBTs or thyristors. A gR or gS type is the one that covers both overload and short circuit.
2) Can I use this 800A square body fuse on a 690V AC system?
Yes. The 170M4218 carries a 690 V AC rating, and the construction is rated 1250V IEC / 1300V UL. At 690V it's within its published AC working voltage, with a 200 kAIC interrupting rating for the fault duty.
3) What size fuse holder or busbar spacing do I need for the Bussmann 170M4218?
It's a square body fuse with blade end x blade end terminals built to DIN 43 620, so it bolts to busbar or a DIN 43 620 base rather than clipping into a cylindrical holder. Overall the body measures 245 mm x 142 mm x 62 mm and it weighs 499 g, so allow that envelope plus clearance in the panel.
4) What I2t values do I use to coordinate this 800A fuse with my thyristors?
For the 170M4218, pre-arc I2t is 52000 A2s and clearing I2t is 850000 A2s at 660 V, with a clearing loss figure of 95. Compare the clearing I2t against the I2t withstand of the semiconductor you're protecting; the device has to survive more than 850000 A2s at that voltage for the coordination to hold.
5) How do I know if this Bussmann high speed fuse has blown without pulling it out?
There's a top-mounted fuse status indicator, so a tech can confirm the fuse condition visually at the panel without de-terminating it or removing it from the bus. Useful on multi-fuse drive cabinets where finding the opened leg otherwise means a meter and downtime.
6) Does the Bussmann 170M4218 come with insulated metal gripping lugs?
No. The 170M4218 is built without IMGL, so the blades are bare bolted tags. If your application needs insulated gripping lugs for live-side handling or touch protection, specify a variant that includes them rather than adding them in the field.
7) Is this fuse acceptable for a CE marked machine being shipped to Europe?
The 170M4218 is IEC rated and CE marked, which is what a machine builder needs on the documentation package for a European installation. Order under manufacturer part number 170M4218.
8) Where does an 800A square body semiconductor fuse like this actually get used?
Typical duty is motor drives and power conversion equipment, rectifier and inverter stacks, high-power industrial circuits, and industrial switchgear and power distribution. Anywhere the load includes solid state devices that will fail before a conventional fuse clears.
How fast can I get the Bussmann 170M4218 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 170M4218 come with a warranty?
Absolutely. The Bussmann 170M4218 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 170M4218?
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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