Bussmann 170M7255 Class aR Sem...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$8,379.40
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Bussmann 170M7255 Class aR Semiconductor Fuse, 1500A 1500V

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Model: 170M7255

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

$8,379.40
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Bussmann 170M7255 Class aR Semiconductor Fuse, 1500A 1500V

The Bussmann 170M7255 is a Class aR semiconductor protection fuse built for demanding high-voltage electrical systems. Rated 1500A at 1500V AC, this fuse falls under utilization category aR (accompanied semiconductor protection), meaning it is designed to work alongside other overcurrent devices rather than as stand-alone short-circuit protection, safeguarding sensitive semiconductor equipment from damaging overcurrent conditions. It is identified by the 4BKN/125AR configuration and is intended for professional industrial installations where dependable, code-aware overcurrent protection is required. This fuse is part of Bussmann's lineup of high-voltage protection devices engineered for power conversion and semiconductor drive applications.

Key Features

  • Voltage Rating: 1500V AC for high-voltage semiconductor protection circuits.
  • Amperage Rating: 1500A rated for demanding overcurrent protection applications.
  • Class aR Construction: Utilization category aR (accompanied semiconductor protection) for use alongside complementary overcurrent devices.
  • Semiconductor Protection Application: Purpose-built to protect semiconductor devices in industrial power systems.
  • Model Configuration: 4BKN/125AR designation identifies this fuse's specific electrical characteristics within the Bussmann 170M7255 series.
  • Standard Packaging: Supplied in standard manufacturer packaging for straightforward stocking and handling.

Technical Specifications

  • Amperage Rating: 1900 A
  • Application: semiconductor protection
  • Class: Class aR
  • Compliances: Contact factory
  • Fuse Indicator: Other
  • Insulated Metal Gripping Lugs Imgl: No
  • Packaging Type: Standard
  • Utilization Category: aR (accompanied semiconductor protection)
  • Voltage Rating: 1500 V
  • Voltage Type: AC

Typical Applications

  • Semiconductor Protection Systems
  • Industrial Power Distribution
  • High-Voltage Electrical Installations
  • Motor Drive and Power Conversion Equipment
  • Panelboard and Switchgear Protection

Why Bussmann?

Bussmann fuses are engineered for dependable overcurrent protection in demanding industrial and semiconductor applications. The 170M7255's Class aR utilization category and defined electrical ratings reflect the precision manufacturing professionals expect for critical power protection. Choose Bussmann for consistent, code-aware performance in high-voltage electrical systems, backed by a manufacturer known throughout the electrical industry for rigorous fuse engineering and quality control.

Manufacturer Resources

Product Specs

Amperage Rating:
1900 A
Application:
semiconductor protection
Class:
Class aR
Compliances:
Contact factory
Fuse Indicator:
Other
Insulated Metal Gripping Lugs Imgl:
No
Packaging Type:
Standard
Product Height:
.001 mm
Product Length Depth:
.001 mm
Product Weight:
.001 g
Product Width:
.001 mm
Utilization Category:
aR (accompanied semiconductor protection)
Voltage Rating:
1500 V
Voltage Type:
AC
Product Group:
Fuses
Department:
Electrical
Product Subgroup:
Other Fuses
Product Type:
Fuse
Product Details:
Fuse

Bussmann 170M7255 – Frequently Asked Questions

1) What does the aR class on the Bussmann 170M7255 fuse actually mean for my circuit protection?
Utilization category aR stands for accompanied semiconductor protection. The 170M7255 is built to protect semiconductor devices against short-circuit current, but it is not intended to stand alone as the overall circuit protection. You still need a complementary overcurrent device (breaker or upstream fuse) handling overload conditions. If you need a fuse that covers both overload and short circuit on its own, you want a gR/gS type instead.
2) Can I use the Bussmann 170M7255 fuse on a 1500V AC system?
Yes. The 170M7255 carries a 1500 V rating and the voltage type is AC, so it suits AC power conversion and drive circuits at that level. The rating is a maximum, so applying it on lower AC system voltages is fine; going above 1500 V is not.
3) Is a semiconductor fuse like the Bussmann 170M7255 the right choice for protecting a VFD or rectifier bridge?
That is exactly its job. Class aR fuses are made to clear far faster than a general-purpose branch fuse so the let-through energy stays below what an SCR, diode or IGBT module can survive. Typical placement is in drive and power conversion equipment, industrial distribution, and switchgear. A standard Class J or RK5 fuse in the same position will not open quickly enough to save the semiconductors.
4) Does the Bussmann 170M7255 come with insulated metal gripping lugs?
No. The 170M7255 is supplied without IMGL (insulated metal gripping lugs), so plan on bolted flush-end terminations into your fuse mounts and allow for the usual clearance and torque practice at the busbar connection.
5) What part number do I order for the Bussmann 170M series aR fuse at 1500V?
Order by the manufacturer part number 170M7255. That is the Bussmann catalog designation, and the 4BKN/125AR body and blade configuration goes with it. Match the configuration code to your existing fuse holder or busbar spacing before ordering, since the 170M family uses several different body sizes.
6) Does the Bussmann 170M7255 have a blown-fuse indicator for use with a microswitch?
The 170M7255 is listed with an indicator type of Other, rather than a standard striker or no indicator. If your panel relies on a specific microswitch or striker kit for trip signalling, confirm the indicator arrangement against your existing hardware, because 170M bodies are offered in both indicating and non-indicating forms.
7) How does the Bussmann 170M7255 ship, and can I stock it as a spare?
It ships in standard manufacturer packaging, which suits shelf stocking in an MRO crib. Semiconductor fuses are commonly stocked as critical spares because a drive is down until the fuse is replaced, and an aR fuse must always be replaced with the same rating and configuration rather than a general-purpose substitute.
How fast can I get the Bussmann 170M7255 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 170M7255 come with a warranty?
Absolutely. The Bussmann 170M7255 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 170M7255?
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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