Bussmann 170M4442 Eaton Series...
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Bussmann 170M4442 Eaton Series High-Speed Square Body Fuse, Class aR, 350A

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Model: 170M4442

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

$1,607.38
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Bussmann 170M4442 Eaton Series High-Speed Square Body Fuse, Class aR, 350A

The Bussmann 170M4442 is an Eaton series high-speed square body fuse rated 700V (UL) / 690V (IEC), 350A, with a 100 kAIC interrupting rating. Built to Class aR utilization category for accompanied semiconductor protection, this fuse features a square body with flush end contacts for compact, high-density panel mounting. It is UL Recognized and CE Marked, making it suitable for demanding industrial power electronics and semiconductor protection applications.

Key Features

  • Amperage Rating: 350A high-speed fuse for reliable overcurrent protection.
  • Voltage Rating: 700V (UL) / 690V (IEC), with a 1250V AC voltage rating listed for the series.
  • Interrupting Rating: 100 kAIC for high fault-current withstand capability.
  • Utilization Category: Class aR (accompanied semiconductor protection).
  • Fuse Shape: Square body construction with flush end contacts for space-saving installation.
  • Clearing I²t: 125,000 at 1000V and 165,000 at 1250V for predictable fault clearing.
  • Pre-Arc I²t: 20,000, supporting coordinated protection schemes.
  • Watt Losses: 70W typical power dissipation.

Certifications & Compliance

  • UL Recognized
  • CE Marked

Technical Specifications

  • Amperage Rating: 350 A
  • Application: semiconductor protection
  • Certifications: UL Recognized
  • Clearing I2t: 125000 at 1000 V, 165000 at 1250 V
  • Compliances: CE Marked
  • Fuse Shape: Square body, flush end contacts
  • Insulated Metal Gripping Lugs (IMGL): No
  • Packaging Type: Standard
  • Pre Arc I2t: 20000
  • Product Height: 59 mm
  • Product Length Depth: 75 mm
  • Product Weight: 2095 g
  • Product Width: 45 mm
  • Utilization Category: aR (accompanied semiconductor protection)
  • Voltage Rating: 1250 V
  • Voltage Type: AC
  • Watt Losses: 70 W

Typical Applications

  • Semiconductor Protection
  • Power Electronics and Drives
  • Industrial Motor Control Systems
  • Rectifier and Converter Circuits
  • High-Speed Overcurrent Protection Panels

Why Bussmann?

Bussmann by Eaton engineers this 170M4442 high-speed square body fuse for demanding semiconductor protection duty, backed by a 100 kAIC interrupting rating and UL Recognized, CE Marked compliance. The Class aR utilization category and documented clearing and pre-arc I²t values give engineers the data needed for accurate protection coordination in critical industrial power circuits.

Manufacturer Resources

Product Specs

Amperage Rating:
350 A
Application:
semiconductor protection
Certifications:
UL Recognized
Class:
Class aR
Clearing I2t:
125000 at 1000 V, 165000 at 1250 V
Compliances:
CE Marked
Fuse Indicator:
Other
Fuse Shape:
Square body, flush end contacts
Insulated Metal Gripping Lugs Imgl:
No
Interrupt Rating:
100 kAIC
Mounting Method:
Flush
Packaging Type:
Standard
Pre Arc I2t:
20000
Product Height:
59 mm
Product Length Depth:
75 mm
Product Weight:
2095 g
Product Width:
45 mm
Utilization Category:
aR (accompanied semiconductor protection)
Voltage Rating:
1250 V
Voltage Type:
AC
Watt Losses:
70 W
Product Group:
Fuses
Department:
Electrical
Product Subgroup:
Other Fuses
Product Type:
Fuse
Product Details:
Fuse

Bussmann 170M4442 – Frequently Asked Questions

1) Will the Bussmann 170M4442 fuse fit my existing square body fuse holder?
The 170M4442 is a square body fuse with flush end contacts, and it measures 75 mm length/depth, 59 mm height, 45 mm width. Flush end contacts mean it bolts flat to the busbar or holder face rather than gripping into clips, so the mounting centers and contact face of your holder have to match that body size. It does not have insulated metal gripping lugs, so if your assembly relies on IMGL-style lugs this is not the right version.
2) Can I use the 170M4442 as a branch circuit or motor overload fuse?
No. The 170M4442 is a Class aR high-speed fuse, and aR means accompanied semiconductor protection: it protects diodes, SCRs and IGBTs against short circuit only, and it must be used alongside a separate overload device such as a breaker, overload relay, or drive electronics. It will not provide overload protection on its own, and it is UL Recognized as a component rather than listed for standalone branch circuit duty.
3) What voltage and fault current can the Bussmann 170M4442 handle?
Rated 700V UL and 690V IEC in service, with a 1250V AC rating carried for the series, and an interrupting rating of 100 kAIC. That 100 kAIC figure is what matters when you are coordinating against the available fault current at a drive or rectifier input on a stiff industrial service.
4) What I2t values do I need for coordinating this fuse with my SCR or diode stack?
Pre-arc I2t is 20,000 and clearing I2t is 125,000 at 1000V and 165,000 at 1250V. Compare the clearing value at your circuit voltage against the semiconductor's published I2t withstand: the device rating has to exceed the fuse clearing I2t for the fuse to protect it. The pre-arc figure is what you use when coordinating the 170M4442 against another fuse in series.
5) How much heat does a 350A Bussmann 170M4442 put into the enclosure?
Typical watt loss is 70 W per fuse at rated 350 A. On a three-phase rectifier or drive with three or six fuses in the cabinet, that is 210 to 420 W of added load on your enclosure cooling, and high-speed fuses derate as ambient temperature climbs. Size the panel ventilation accordingly.
6) Is the Bussmann 170M4442 acceptable for equipment shipping to Europe?
It is CE Marked as well as UL Recognized, so it can be specified into machinery built for both North American and European markets. The published ratings carry both references: 700V under UL and 690V under IEC.
7) What is the exact part number and weight I should put on the purchase order for this Bussmann high-speed fuse?
Order it as Bussmann by Eaton 170M4442, the 350A Class aR square body high-speed fuse. Each piece weighs 2095 g and ships in standard packaging, so plan freight accordingly if you are stocking a full set of spares for a drive lineup.
8) Where is a 350A Class aR high-speed fuse like this actually used?
Typical duty is semiconductor protection in power electronics: variable frequency drives, rectifier and converter bridges, industrial motor control, and high-speed overcurrent protection panels. Anywhere a silicon device can be destroyed faster than a conventional fuse can open, a high-speed aR fuse is what goes in.
How fast can I get the Bussmann 170M4442 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 170M4442 come with a warranty?
Absolutely. The Bussmann 170M4442 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 170M4442?
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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