Bussmann 170M4814 Eaton Series...
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Bussmann 170M4814 Eaton Series High Speed Square Body Fuse, 250A, 700V, Class aR

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Model: 170M4814

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

$1,022.58
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Bussmann 170M4814 Eaton Series High Speed Square Body Fuse, 250A, 700V, Class aR

The Bussmann 170M4814 is an Eaton Bussmann series high speed square body fuse for demanding semiconductor protection duty. Rated 700V (UL) / 690V (IEC) with a 250A amperage rating and a 125 kAIC interrupt rating, this Class aR fuse accompanies semiconductor devices where fast clearing and high interrupting capability are critical. It features a square body with slotted offset bolted tags, a blade end configured to DIN 43-620, and a top-mounted fuse status indicator for quick visual verification. It is CE marked and IEC rated.

Key Features

  • Compact Footprint: 98 mm length/depth x 51 mm height x 28 mm width for space-efficient panel mounting.
  • Fuse Shape: Square body construction with slotted offset bolted tags for secure, low-resistance connections.
  • Blade End Termination: Blade end configured to DIN 43-620 for compatibility with standard high-speed fuse holders and disconnects.
  • Voltage & Current Rating: 700V (UL) / 690V (IEC), 250A, with a 125 kAIC interrupt rating for high-capacity circuit protection.
  • Clearing Characteristics: Pre-arc I2t of 10,000 and clearing I2t of 74,000 at 1000V for precise semiconductor protection coordination.
  • Top Fuse Status Indicator: Visual indicator on top of the fuse body for fast identification of a blown fuse.
  • Watt Losses: Rated at 48W power dissipation.
  • AC Voltage Rating: 1000V AC voltage rating for AC power distribution systems.

Certifications & Compliance

  • IEC Rated
  • CE Marked

Technical Specifications

  • Amperage Rating: 250 A
  • Application: semiconductor protection
  • Certifications: IEC Rated
  • Clearing I2t: 74000 at 1000 V
  • Compliances: CE Marked
  • Fuse Shape: Square body, slotted offset bolted tags
  • Insulated Metal Gripping Lugs (IMGL): No
  • Packaging Type: Standard
  • Pre Arc I2t: 10000
  • Product Height: 51 mm
  • Product Length Depth: 98 mm
  • Product Weight: 233.3333333 g
  • Product Width: 28 mm
  • Utilization Category: aR (accompanied semiconductor protection)
  • Voltage Rating: 1000 V
  • Voltage Type: AC
  • Watt Losses: 48 W

Typical Applications

  • Semiconductor Protection
  • High-Speed Fuse Protection for Power Electronics
  • Industrial Power Distribution Systems
  • OEM Equipment Requiring IEC-Rated Fuse Protection
  • AC Power Systems Requiring High Interrupt Rating Protection

Why Bussmann?

Bussmann by Eaton is a recognized leader in circuit protection. The 170M4814 reflects that standard with robust square body construction, precise pre-arc and clearing I2t characteristics, and a 125 kAIC interrupt rating for demanding semiconductor protection duty. CE marked and IEC rated, this fuse delivers reliable, code-compliant performance in industrial and OEM power electronics applications.

Manufacturer Resources

Product Specs

Amperage Rating:
250 A
Application:
semiconductor protection
Certifications:
IEC Rated
Class:
Class aR
Clearing I2t:
74000 at 1000 V
Compliances:
CE Marked
Connection:
Blade end x Din 43-620 blade end
Fuse Indicator:
Top fuse status indicator
Fuse Shape:
Square body, slotted offset bolted tags
Insulated Metal Gripping Lugs Imgl:
No
Interrupt Rating:
125 kAIC
Mounting Method:
DIN 43 620
Packaging Type:
Standard
Pre Arc I2t:
10000
Product Height:
51 mm
Product Length Depth:
98 mm
Product Weight:
233.3333333 g
Product Width:
28 mm
Utilization Category:
aR (accompanied semiconductor protection)
Voltage Rating:
1000 V
Voltage Type:
AC
Watt Losses:
48 W
Product Group:
Fuses
Department:
Electrical
Product Subgroup:
Other Fuses
Product Type:
Fuse
Product Details:
Fuse

Bussmann 170M4814 – Frequently Asked Questions

1) Will the Bussmann 170M4814 fuse fit my existing square body fuse holder?
The 170M4814 uses a square body with slotted offset bolted tags and blade ends made to DIN 43-620, so it bolts into holders and disconnects built to that DIN blade standard. Body size is 98 mm length/depth by 51 mm height by 28 mm width, so check your holder centers and the panel space before you commit. It does not have insulated metal gripping lugs, so it is a bare bolted-tag fit.
2) Can I use a Class aR fuse like the 170M4814 as the only overcurrent protection on a branch circuit?
No. The aR utilization category means accompanied semiconductor protection: it clears short circuits fast to save the semiconductor, but it is not a full-range device and does not cover overload protection on its own. Pair it with a breaker or gG/other overload device for the circuit. If you need a full-range semiconductor fuse, you want a gR/gS type instead.
3) What voltage and fault current can the Bussmann 170M4814 handle?
It is rated 700V UL / 690V IEC for circuit application with a 125 kAIC interrupting rating, which covers most industrial drive and rectifier sections fed from a stiff service. The published voltage rating field is 1000V AC, and the clearing I2t figure of 74,000 is stated at 1000V. Amperage rating is 250A.
4) How do I know if the I2t of this fuse will actually protect my SCRs or diodes?
Compare the fuse let-through numbers against the device rating on your semiconductor datasheet. The 170M4814 publishes a pre-arc I2t of 10,000 and a clearing I2t of 74,000 at 1000V. The semiconductor I2t withstand must exceed the fuse clearing I2t at your actual system voltage; if it does not, you need a lower amp rating in the series.
5) Will a standard Class J or Class T fuse work in place of this Bussmann high speed fuse?
No. Class J and Class T are general power distribution fuses with slower clearing, and they will not hold the let-through energy low enough to save a diode or IGBT. The 170M4814 is a high speed semiconductor fuse with a pre-arc I2t of 10,000, and it also mounts on DIN 43-620 bolted blade ends rather than ferrule or knife-blade clips, so it is not a mechanical swap either.
6) How much heat will a 250A high speed fuse add inside my enclosure?
Budget 48W of dissipation per fuse at rated current for the 170M4814. On a three-phase set that is roughly 144W into the cabinet, which matters when you size cooling or stack fuses close together. Watt loss also drops off with load, so a fuse running well below 250A gives off less.
7) Can maintenance tell a blown 170M4814 without pulling it out of the holder?
Yes. There is a fuse status indicator on the top of the body, so a tech can check it visually from the front of the panel rather than removing bolted tags or meter-testing each leg. Useful for MRO crews troubleshooting a dropped drive.
8) Is the Bussmann 170M4814 acceptable for equipment we are exporting to Europe?
It is CE marked and IEC rated, with the blade end built to the DIN 43-620 standard, so it suits OEM gear built to IEC practice. The 690V IEC rating is the figure to use for European system documentation.
9) What is the weight of the Bussmann 170M4814 fuse?
About 233 g per fuse. Worth knowing when you are bracing a busbar-mounted fuse bank or calculating shipping on a spares order of several.
How fast can I get the Bussmann 170M4814 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 170M4814 come with a warranty?
Absolutely. The Bussmann 170M4814 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 170M4814?
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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