Bussmann 170M7511 Class aR Sem...
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Bussmann 170M7511 Class aR Semiconductor Fuse, 1500A 1250V

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Model: 170M7511

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

$8,999.29
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Bussmann 170M7511 Class aR Semiconductor Fuse, 1500A 1250V

The Bussmann 170M7511 is a Class aR semiconductor fuse rated 1500A at 1250V AC, purpose-built for accompanied semiconductor protection (aR utilization category) in demanding industrial power electronics. This flush-mounted fuse delivers a 125 kAIC interrupt rating along with defined pre-arc and clearing I2t characteristics for coordinated circuit protection. It is IEC rated and CE marked, supporting compliant installations in industrial drives, rectifiers, and power conversion equipment where fast-acting, current-limiting protection of semiconductor devices is critical.

Key Features

  • Amperage & Voltage Rating: Rated 1500A at 1250V AC for high-power semiconductor protection circuits.
  • Class aR Design: Utilization Category aR (accompanied semiconductor protection) delivers precise let-through control for sensitive power semiconductor devices.
  • High Interrupt Rating: 125 kAIC interrupt rating provides dependable performance under high fault-current conditions.
  • Mounting Method: Flush mounting configuration for standard industrial fuse holders and disconnects.
  • Clearing I2t: 8,700,000 (at 1250V) for coordinated downstream protection.
  • Pre-Arc I2t: 1,400,000 for predictable let-through energy performance.
  • Watt Losses: 220W rated power dissipation.

Certifications & Compliance

  • IEC Rated
  • CE Marked

Technical Specifications

  • Amperage Rating: 1700 A
  • Application: semiconductor protection
  • Certifications: IEC Rated
  • Class: Class aR
  • Clearing I2t: 8700000 at 1250 V
  • Compliances: CE Marked
  • Fuse Indicator: Other
  • Insulated Metal Gripping Lugs (IMGL): No
  • Interrupt Rating: 125 kAIC
  • Mounting Method: Flush
  • Packaging Type: Standard
  • Pre Arc I2t: 1400000
  • Product Height: 116 mm
  • Product Length Depth: 202 mm
  • Product Weight: 746.4309952 g
  • Product Width: 140 mm
  • Utilization Category: aR (accompanied semiconductor protection)
  • Voltage Rating: 1250 V
  • Voltage Type: AC
  • Watt Losses: 220 W

Typical Applications

  • Power Semiconductor Device Protection
  • Industrial Drives and Rectifier Circuits
  • Power Conversion and Rectifier Equipment
  • High-Power Industrial Electrical Systems
  • Coordinated Overcurrent Protection Schemes

Why Bussmann?

Bussmann is a trusted name in circuit protection, and the 170M7511 Class aR fuse reflects that standard with IEC-rated, CE-marked construction built for demanding semiconductor protection applications. Its high interrupt rating along with defined pre-arc and clearing I2t performance support reliable, coordinated protection for critical power electronics. Choose Bussmann for consistent, dependable overcurrent protection engineered to industrial standards.

Manufacturer Resources

Product Specs

Amperage Rating:
1700 A
Application:
semiconductor protection
Certifications:
IEC Rated
Class:
Class aR
Clearing I2t:
8700000 at 1250 V
Compliances:
CE Marked
Fuse Indicator:
Other
Insulated Metal Gripping Lugs Imgl:
No
Interrupt Rating:
125 kAIC
Mounting Method:
Flush
Packaging Type:
Standard
Pre Arc I2t:
1400000
Product Height:
116 mm
Product Length Depth:
202 mm
Product Weight:
746.4309952 g
Product Width:
140 mm
Utilization Category:
aR (accompanied semiconductor protection)
Voltage Rating:
1250 V
Voltage Type:
AC
Watt Losses:
220 W
Product Group:
Fuses
Department:
Electrical
Product Subgroup:
Other Fuses
Product Type:
Fuse
Product Details:
Fuse

Bussmann 170M7511 – Frequently Asked Questions

1) What does the aR utilization category on the Bussmann 170M7511 fuse actually mean for my drive?
aR stands for accompanied semiconductor protection. The 170M7511 is built to protect power semiconductors (diodes, thyristors, IGBT stacks) against short circuit faults only, not against overloads. It has to be accompanied by separate overload protection, typically the drive's electronic overload or an upstream device. If you need a fuse that handles both overload and short circuit on a general feeder, an aR semiconductor fuse is the wrong choice.
2) Can I use the Bussmann 170M7511 semiconductor fuse on a 690V or 1000V AC drive?
Yes on both counts. The 170M7511 carries a 1250V AC rating, so applying it at 690V or 1000V AC is within rating. Voltage rating is a ceiling, not a target. Note it is rated for AC service; do not apply it on a DC link or DC output section on the strength of the AC rating.
3) What I2t values do I use to coordinate this fuse with my thyristor or diode rating?
Two numbers matter when you check the fuse against the semiconductor's I2t withstand. The 170M7511 has a pre-arc (melting) I2t of 1,400,000 A2s and a total clearing I2t of 8,700,000 A2s at 1250V. The device you are protecting must have an I2t withstand greater than the clearing value at your actual applied voltage. Clearing I2t falls off as applied voltage drops below the rated 1250V, so using the 1250V figure is the conservative check.
4) Can I substitute a standard Class J or Class T fuse for this Bussmann semiconductor fuse?
No. Class J and Class T are branch circuit fuses with much slower melting characteristics and far higher let-through energy than an aR semiconductor fuse. The 170M7511 is selected on its 1,400,000 A2s pre-arc and 8,700,000 A2s clearing I2t so the silicon fails last, not first. Swapping in a general purpose fuse of the same amp rating will let a fault destroy the diodes or thyristors before the fuse opens. Replace an aR semiconductor fuse only with another aR fuse of equal or lower I2t and equal or higher voltage and interrupting rating.
5) How much heat does the Bussmann 170M7511 put into the enclosure?
Figure 220W of dissipation per fuse at full rated load. In a three phase drive that is roughly 660W from the fuse set alone, which is a real load on enclosure cooling. Size ventilation or the air conditioner accordingly, and remember published watt loss assumes an open, well ventilated mounting; a tightly packed cabinet will run hotter and may require derating.
6) How is the Bussmann 170M7511 mounted, and what space do I need to allow in the panel?
It is a flush mount square body fuse, bolted to busbar or into a flush mounting fuse base rather than clipped into a ferrule holder. Overall size is 202 mm by 140 mm by 116 mm and it weighs about 746 g, so the bus stabs and any supporting bracket need to carry that mass plus vibration. Lay out the panel with clearance for the full 202 mm dimension plus room to get a wrench on the mounting bolts.
7) Is this Bussmann square body fuse acceptable for a CE marked machine being shipped to Europe?
Yes. The 170M7511 is IEC rated and CE marked, which is what a machine builder needs for the fuse element of a CE declaration on industrial drive and rectifier equipment. If your job is instead being inspected to a North American listing basis, verify the panel's overall listing requirements separately, since an IEC rating is not the same document as a North American component listing.
8) Does the Bussmann 170M7511 come with insulated metal gripping lugs?
No. The 170M7511 is supplied without IMGL insulated gripping lugs, so the fuse body terminals land directly on the bus or fuse base. If your install needs insulated handling tabs for safe removal under a live adjacent bus, you need a different variant of the square body fuse or separate shrouding at the connection.
9) Does this fuse have a blown fuse indicator I can wire to a microswitch?
The 170M7511 is catalogued with an indicator type listed as other, meaning it is not one of Bussmann's standard striker or visual indicator configurations. Do not plan a microswitch trip circuit around it without confirming the exact indicator arrangement for this part number; many square body drive installations instead monitor phase loss or DC bus fault at the drive itself.
How fast can I get the Bussmann 170M7511 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 170M7511 come with a warranty?
Absolutely. The Bussmann 170M7511 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 170M7511?
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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