Bussmann 170M-423 High-Speed S...
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Bussmann 170M-423 High-Speed Square Body Fuse, Class aR, 1300V 160A

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Model: 170M4238

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

$1,377.90
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Bussmann 170M-423 High-Speed Square Body Fuse, Class aR

The Bussmann 170M-423 is a high-speed square body fuse engineered by Eaton Bussmann for demanding semiconductor protection applications. Rated 1250V (IEC) / 1300V (UL) and 160A with a 100 kAIC interrupt rating, this Class aR fuse is built to the DIN 43 620 square body standard with slotted, center bolted tags for secure termination. As an accompanied semiconductor protection (aR) device, it is designed to work alongside coordinated overcurrent protection to safeguard sensitive power semiconductor components in industrial and commercial electrical systems.

Key Features

  • Voltage Rating: 1250V (IEC) / 1300V (UL) for high-voltage semiconductor circuit protection.
  • Amperage Rating: 160A continuous current rating suited for demanding power electronics loads.
  • Interrupt Rating: 100 kAIC high interrupting capacity for reliable fault clearing in high fault-current systems.
  • Utilization Category: Class aR (accompanied semiconductor protection) fuse, designed for coordinated protection of power semiconductor devices.
  • Fuse Shape: Square body with slotted, center bolted tags, built to the DIN 43 620 standard for consistent fit and secure mounting.
  • Product Height: 67 mm body height for standard semiconductor fuse mounting configurations.
  • Voltage Type: AC-rated for alternating current power distribution and conversion systems.
  • Packaging: Standard packaging type for individual unit handling.

Certifications & Compliance

  • CE Marked

Technical Specifications

  • Application: Semiconductor protection.
  • Utilization Category: aR (accompanied semiconductor protection).
  • Product Height: 67 mm.
  • Voltage Type: AC.
  • Insulated Metal Gripping Lugs (IMGL): No.
  • Packaging Type: Standard.
  • Fuse Shape: Square body, slotted center bolted tags.
  • Compliances: CE Marked.

Typical Applications

  • Power Semiconductor Device Protection
  • Industrial and Commercial Power Electronics
  • Coordinated High-Speed Overcurrent Protection Systems
  • Variable Frequency Drive and Power Conversion Equipment

Why Bussmann?

Bussmann by Eaton engineers the 170M-423 to the DIN 43 620 square body standard with a robust 100 kAIC interrupt rating and CE marked compliance, delivering dependable, code-compliant overcurrent protection for demanding semiconductor and power electronics applications. Its Class aR accompanied protection design supports coordinated fuse protection schemes trusted by electrical professionals for reliable, long-term performance.

Manufacturer Resources

Product Specs

Product Details:
Fuse
Application:
semiconductor protection
Utilization Category:
aR (accompanied semiconductor protection)
Product Type:
Fuse
Product Height:
67 mm
Interrupt Rating:
100 kAIC
Product Group:
Fuses
Voltage Type:
AC
Voltage Rating:
1250V
Product Subgroup:
Other Fuses
Insulated Metal Gripping Lugs Imgl:
No
Class:
Class aR
Packaging Type:
Standard
Fuse Indicator:
Other
Fuse Shape:
Square body, slotted center bolted tags
Mounting Method:
DIN 43 620
Compliances:
CE Marked
Department:
Electrical

Bussmann 170M4238 – Frequently Asked Questions

1) What amp ratings does the Bussmann 170M-423 square body fuse come in?
The 170M-42xx square body family runs 160A, 250A, 350A, 400A and 450A. Each amp rating is its own part number: 170M4238 (160A), 170M4240 (250A), 170M4242 (350A), 170M4243 (400A) and 170M4244 (450A). Order by the part number that matches the amp rating on your drive or converter schematic, since the body and mounting are common across the range.
2) Will a Bussmann 170M-423 fuse bolt into my existing DIN 43 620 fuse holder?
Yes, if the holder is built to DIN 43 620. The 170M-423 is a square body fuse with slotted, center bolted tags mounted to the DIN 43 620 standard, so it lands on the same bolt centers as other square body fuses built to that standard. Body height is 67 mm. It bolts down rather than clipping in, so you need a bolt-down base, not a ferrule or blade clip holder.
3) Can I use a Class aR semiconductor fuse as the only overcurrent protection on a circuit?
No. aR stands for accompanied semiconductor protection, which means the fuse clears short circuit faults only and has to work alongside a separate overcurrent device (a breaker or a gR/gS type fuse) handling overload. The 170M-423 is an aR device, so it protects diodes, thyristors and IGBTs from fault current but will not give you overload protection on its own. If you need one device doing both, you want a full-range gR or gS semiconductor fuse instead.
4) What voltage and interrupting rating does the Bussmann 170M-423 carry?
It is rated 1250V per IEC, with a 100 kAIC interrupting rating, and it is an AC-rated device. That interrupting capacity is what lets it sit in high fault-current industrial services feeding drives and converters. It is not a DC-rated part, so do not drop it into a DC link without a DC rating on the drawing.
5) Is this the right fuse to protect a variable frequency drive or power converter?
That is exactly what it is built for. The 170M-423 is specified for semiconductor protection, meaning the rectifier and inverter stages of VFDs, soft starters, rectifier bridges and converter equipment, where a standard industrial fuse is too slow to save the silicon. Pick the amp rating from the drive manufacturer's recommended semiconductor fuse size, not from the motor FLA.
6) Does the Bussmann 170M-423 have insulated metal gripping lugs?
No. The 170M-423 is supplied without IMGL. Terminations are bare slotted, center bolted tags, so plan on bolted bus or cable lug connections at the fuse base and observe normal clearance around live tags. If your panel spec calls for insulated gripping lugs, this is not the variant for it.
7) Is the Bussmann 170M-423 CE marked for a European machine build?
Yes, the 170M-423 square body fuse is CE marked, which covers it for machinery and panel builds carrying a CE declaration. That is the compliance mark stated for the part.
8) How much room do I need in the panel for this square body fuse?
Allow for a 67 mm body height plus clearance above the tags for the bolted connections and any cable bend radius. The fuse mounts flat to a DIN 43 620 base, so the base footprint plus that 67 mm stack is what drives the space you need behind the door.
9) Do these Bussmann square body fuses come with a blown fuse indicator or microswitch?
The indicator type on the 170M-423 is listed as other, not a standard striker or microswitch option, and the fuse ships in standard individual packaging. If your control scheme relies on a trip signal from the fuse, specify a 170M part number that is explicitly ordered with an indicator and microswitch rather than assuming this one carries it.
How fast can I get the Bussmann 170M4238 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 170M4238 come with a warranty?
Absolutely. The Bussmann 170M4238 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 170M4238?
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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