Bussmann 170M4266 High Speed S...
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Bussmann 170M4266 High Speed Square Body Fuse, 630A, Class aR

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Model: 170M4266

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

$1,096.09
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Bussmann 170M4266 High Speed Square Body Fuse, 630A, Class aR

The Bussmann 170M4266 is an Eaton Bussmann series high speed square body fuse engineered for demanding semiconductor protection applications. Rated 700V (UL) and 690V (IEC) with a 630A amperage rating and a 200 kAIC interrupt rating, this Class aR fuse meets the DIN 43 620 standard with blade end x blade end connections for reliable, code-compliant power electronics protection.

Key Features

  • Amperage Rating: 630A for high-capacity circuit protection.
  • Voltage Rating: 700V (UL) and 690V (IEC) for use in both UL- and IEC-governed systems.
  • Interrupt Rating: 200 kAIC for dependable performance under high fault-current conditions.
  • Utilization Category: Class aR (accompanied semiconductor protection) for coordinated protection of semiconductor devices.
  • Fuse Construction: Square body design with slotted center bolted tags and blade end x blade end connections.
  • Clearing I²t: 465,000 A²s at 660V, with a pre-arc I²t of 25,000 A²s for precise current-limiting coordination.
  • Clearing Loss: Rated clearing loss of 80 for efficient thermal performance.
  • Compact Dimensions: Measures 245 mm in length, 142 mm in width, and 62 mm in height, weighing approximately 505.33 g.

Certifications & Compliance

  • IEC Rated
  • CE Marked

Technical Specifications

  • Amperage Rating: 630 A
  • Application: semiconductor protection
  • Certifications: IEC Rated
  • Clearing I2t: 465000 at 660 V
  • Clearing Loss: 80
  • Compliances: CE Marked
  • Fuse Shape: Square body, slotted center bolted tags
  • Insulated Metal Gripping Lugs (Imgl): No
  • Packaging Type: Standard
  • Pre Arc I2t: 25000
  • Product Height: 62 mm
  • Product Length Depth: 245 mm
  • Product Weight: 505.3333333 g
  • Product Width: 142 mm
  • Utilization Category: aR (accompanied semiconductor protection)
  • Voltage Rating: 690 V
  • Voltage Type: AC

Typical Applications

  • Semiconductor Device Protection Circuits
  • High Speed Power Electronics Protection
  • Industrial Systems Requiring Class aR Coordinated Fuses
  • Applications Governed by UL 700V and IEC 690V Standards

Why Bussmann?

The Bussmann 170M4266 combines Eaton Bussmann engineering with IEC-rated, CE-marked construction for semiconductor protection where high interrupt capacity and precise current limitation matter. Its Class aR utilization category and 200 kAIC interrupt rating make it a dependable choice for coordinated protection of power semiconductor devices in professional electrical installations.

Manufacturer Resources

Product Specs

Amperage Rating:
630 A
Application:
semiconductor protection
Certifications:
IEC Rated
Class:
Class aR
Clearing I2t:
465000 at 660 V
Clearing Loss:
80
Compliances:
CE Marked
Connection:
Blade end x blade end
Fuse Indicator:
Other
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:
25000
Product Height:
62 mm
Product Length Depth:
245 mm
Product Weight:
505.3333333 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 170M4266 – Frequently Asked Questions

1) Will the Bussmann 170M4266 fuse mount in a DIN 43 620 square body fuse holder?
Yes. The 170M4266 is built to the DIN 43 620 mounting standard with blade end x blade end terminations, so it drops into standard DIN square body holders and bolted busbar arrangements sized for that pattern. The body measures 245 mm x 142 mm x 62 mm, so confirm your enclosure or holder clears those dimensions before you commit.
2) Can I use a Class aR fuse like the 170M4266 as the main branch circuit protection?
No. Class aR is an accompanied semiconductor protection fuse, meaning it only protects over part of the current range and has to work alongside a separate overload protective device such as a breaker or overload relay. If you need a fuse that handles the full range from overload through short circuit on its own, you need a gR/gS full range semiconductor fuse, not this one.
3) What voltage systems is the Bussmann 170M4266 630A fuse rated for?
It carries a 690 V AC IEC rating and a 700 V UL rating, so it suits drives, rectifiers and converter sections running on 600 V or 690 V three phase AC. It is an AC-rated device, so do not apply it to a DC link or DC bus on this rating.
4) How do I check this fuse will actually protect my SCRs or diodes?
Compare let-through energy against the device rating. The 170M4266 has a clearing I2t of 465,000 A2s at 660 V and a pre-arc I2t of 25,000 A2s. For the fuse to protect the semiconductor, the device's own I2t withstand must exceed the fuse total clearing I2t at your applied voltage. Note the clearing figure is quoted at 660 V, and let-through rises with applied voltage, so allow margin if you are running closer to 690 V.
5) Is 200 kAIC enough interrupt rating for my drive panel with a high available fault current?
The 170M4266 is rated to interrupt 200 kA, which covers essentially any industrial service where the available fault current is documented at or below 200 kA at 690 V. That is the top of the commercial range for square body semiconductor fuses, so the fuse is rarely the limiting element in the short circuit current rating of a drive panel.
6) Is the Bussmann 170M4266 acceptable for a machine being exported to Europe?
It is IEC rated and CE marked, with a 690 V IEC voltage rating, which is what a panel builder needs for CE declaration on European-bound equipment. The same part also carries a 700 V UL rating, so one fuse covers both a domestic UL panel and an IEC export build.
7) Do I need to allow for heat rejection when I put this 630A fuse in an enclosure?
Yes. The 170M4266 has a rated clearing loss of 80, so it dissipates watts into the cubicle at full 630 A load. On a multi-fuse rectifier or drive section, add up the losses across all the fuses and size ventilation or the cooling fan accordingly. Restricted airflow around the body also forces derating of the 630 A rating.
8) Does the Bussmann 170M4266 have a blown fuse indicator or a microswitch?
The 170M4266 is a slotted center bolted tag square body fuse and does not come with insulated metal gripping lugs. Its indicator type is listed generically rather than as a striker pin, so if your panel relies on a microswitch or striker to trip a signal contact, verify the indicator arrangement against the body before you order it as a direct replacement for an indicating fuse.
9) How heavy is the 170M4266 and does it need supporting?
Each fuse weighs about 505 g and is 245 mm long. That weight sits on the two bolted blade ends, so on vibrating equipment the busbar or holder should be rigid and the bolted joints torqued and checked, rather than relying on flexible cable terminations to carry the fuse body.
How fast can I get the Bussmann 170M4266 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 170M4266 come with a warranty?
Absolutely. The Bussmann 170M4266 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 170M4266?
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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