Bussmann 170M7358 High-Speed N...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$1,080.28
Bussmann 170M7358 Fuse-link, high speed, 200 A, AC 800 V, size NH1, 135 x 53 x 40 mm, gR, IEC, dual indicator -170M7358

Bussmann 170M7358 High-Speed NH1 Fuse-Link, 200A, 800V AC, Class gR

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Model: 170M7358
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Bussmann 170M7358 High-Speed NH1 Fuse-Link, 200A, 800V AC, Class gR

The Bussmann 170M7358 is a high-speed, size NH1 fuse-link engineered for demanding power electronics and semiconductor protection duty. Rated 200 A at AC 800 V, this IEC fuse-link carries a gR utilization category for general purpose semiconductor protection, backed by a 65 kA breaking capacity and 65 kAIC interrupt rating. Measuring 135 x 53 x 40 mm and featuring a combination (dual) fuse status indicator, the 170M7358 delivers fast-acting overcurrent protection for industrial power systems and is UL Recognized and CE Marked for compliant installations.

Key Features

  • Amperage & Voltage Rating: Rated 200 A at AC 800 V for high-speed overcurrent protection in industrial power circuits.
  • Fuse Size: Size NH1 IEC fuse-link measuring 135 x 53 x 40 mm, sized for standard NH1 fuse holders and disconnects.
  • Utilization Category: Class gR, general purpose semiconductor protection for power electronics and rectifier circuits.
  • Breaking Capacity: 65 kA breaking capacity with a 65 kAIC interrupt rating for reliable fault clearing under load.
  • Fuse Indicator: Combination fuse status indicator (dual indicator) for quick visual confirmation of fuse condition.
  • I2t Characteristics: Pre-arc I2t of 10200 and clearing I2t of 140000 for coordinated semiconductor protection schemes.
  • Watt Losses: Rated watt loss of 25 W for efficient thermal performance in enclosed switchgear and panelboards.

Certifications & Compliance

  • UL Recognized
  • CE Marked

Technical Specifications

  • Breaking Capacity: 65 kA
  • Certifications: UL Recognized
  • Class: Class gR
  • Clearing I2t: 140000
  • Compliances: CE Marked
  • Fuse Indicator: Combination fuse status indicator
  • Fuse Size: NH1
  • Insulated Metal Gripping Lugs (Imgl): No
  • Interrupt Rating: 65 kAIC
  • Pre Arc I2t: 10200
  • Product Height: 135 mm
  • Product Length Depth: 52.9 mm
  • Product Weight: 407.3333333 g
  • Product Width: 39.7 mm
  • Rated Switching Capacity: 65 kA
  • Utilization Category: gR (general purpose semiconductor protection)
  • Voltage Type: AC
  • Watt Losses: 25 W

Typical Applications

  • Power Semiconductor Device Protection
  • Variable Frequency Drives and Rectifier Circuits
  • Industrial Power Electronics Equipment
  • Motor Control Centers and Switchgear Assemblies
  • Panelboard and Disconnect Overcurrent Protection

Why Bussmann?

Bussmann fuse-links are built for dependable, code-compliant overcurrent protection in demanding industrial applications. The 170M7358 combines a 65 kA breaking capacity, a gR semiconductor protection rating, and a combination fuse status indicator in a compact size NH1 package, and is UL Recognized and CE Marked for professional electrical installations. Choose Bussmann for consistent, high-speed fuse performance built to protect critical power electronics equipment.

Manufacturer Resources

Product Specs

Amperage Rating:
200 A
Breaking Capacity:
65 kA
Certifications:
UL Recognized
Class:
Class gR
Clearing I2t:
140000
Compliances:
CE Marked
Fuse Indicator:
Combination fuse status indicator
Fuse Size:
NH1
Insulated Metal Gripping Lugs Imgl:
No
Interrupt Rating:
65 kAIC
Pre Arc I2t:
10200
Product Height:
135 mm
Product Length Depth:
52.9 mm
Product Weight:
407.3333333 g
Product Width:
39.7 mm
Rated Switching Capacity:
65 kA
Utilization Category:
gR (general purpose semiconductor protection)
Voltage Rating:
800 V
Voltage Type:
AC
Watt Losses:
25 W
Department:
Electrical
Product Type:
Fuse
Product Group:
Fuses
Product Subgroup:
Other Fuses

Bussmann 170M7358 – Frequently Asked Questions

1) Will the Bussmann 170M7358 fit a standard NH1 fuse holder or disconnect?
Yes. The 170M7358 is a size NH1 IEC fuse-link, so it drops into standard NH1 bases, holders and NH1 fuse disconnects. Body dimensions are 135 mm high, 52.9 mm deep and 39.7 mm wide, and it weighs about 407 g, so allow for the mass when it is mounted in a hinged door disconnect.
2) Can I use the Bussmann 170M7358 on a 600V or 480V AC drive circuit?
Yes. It is rated 800 V AC, which is a maximum, so it applies at any system voltage up to that figure including 480 V and 600 V AC circuits. It is an AC-rated fuse-link only, so don't apply it to a DC bus without a DC rating for the part.
3) What does Class gR mean on a semiconductor fuse, and is it different from aR?
gR is a full-range semiconductor fuse: it clears both short-circuit faults and lower-level overloads, so it can protect a circuit on its own. The 170M7358 carries the gR utilization category for general purpose semiconductor protection. An aR fuse is partial-range, back-up only, and needs a separate overload device such as a breaker or overload relay in series. If your drive or rectifier design assumes the fuse handles overload as well as fault current, gR is the category you want.
4) Is 65 kA enough interrupting capacity for my switchgear fault current?
The 170M7358 is rated 65 kA breaking capacity and 65 kAIC interrupt. That covers any point in the system where the available fault current calculated for that bus is at or below 65 kA at 800 V AC or less. Above that, the fuse is misapplied and you need a device with a higher interrupting rating.
5) What I2t values do I use to coordinate this fuse with my IGBT or SCR?
Pre-arc (melting) I2t is 10200 and total clearing I2t is 140000. The rule for semiconductor protection is that the fuse's clearing I2t must stay below the I2t withstand of the device it protects, so compare 140000 against the rated I2t of your SCR or diode. Use the 10200 pre-arc figure when checking selectivity against an upstream fuse.
6) Can I substitute a standard Class J or RK5 200A fuse for this high-speed semiconductor fuse?
No. A Class J or RK5 branch-circuit fuse clears far too slowly to protect power semiconductors. The 170M7358 is a high-speed link with a 10200 pre-arc I2t sized to open before an SCR or IGBT fails. Swapping in a general-purpose 200 A fuse will leave the drive's power stage unprotected even though the amp rating matches. Replace it with a high-speed NH1 link of the same 200 A, 800 V AC and gR ratings.
7) How much heat does the 170M7358 put into an enclosed panel?
Rated watt loss is 25 W at full 200 A load. In a sealed or gasketed enclosure, count that per fuse when you size ventilation or a panel cooler. Three fuses on a three-phase drive input means roughly 75 W of added heat inside the box at rated current.
8) Can a tech tell if this fuse has blown without pulling it out of the holder?
Yes. The 170M7358 has a combination (dual) fuse status indicator, so a blown element shows visually at the fuse. That means a maintenance electrician can confirm the fault from the front of the disconnect instead of de-energizing and removing a 200 A NH1 link to meter it.
9) Does the Bussmann 170M7358 come with insulated gripping lugs for hot handling?
No. The 170M7358 is supplied without insulated metal gripping lugs (IMGL), so removal and installation is done with an NH fuse puller handle rather than by gripping the blade ends. If your maintenance procedure specifies IMGL-equipped links, this is not the right part number.
10) Is the Bussmann 170M7358 approved for use in a UL panel build and for export to Europe?
It is UL Recognized and CE Marked. UL Recognized means it is a component approved for use inside listed equipment such as a drive panel or motor control center, rather than a standalone listed device. The CE mark covers it for IEC-standard installations, which matters if the assembly ships into Europe.
11) Where is a 200A high-speed NH1 fuse-link like this typically used?
Input and DC-link protection on variable frequency drives, rectifier and converter stacks, soft starters and other industrial power electronics, plus feeders in motor control centers and switchgear where the load is a semiconductor device. The 200 A, 800 V AC rating with gR full-range characteristic suits drive branch circuits where the fuse is the only overcurrent device on that leg.
How fast can I get the Bussmann 170M7358 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 170M7358 come with a warranty?
Absolutely. The Bussmann 170M7358 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 170M7358?
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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