Bussmann 170M4689 Class aR Squ...
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Bussmann 170M4689 Class aR Square Body Fuse, 200A 1250V

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Model: 170M4689

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

$1,144.54
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Bussmann 170M4689 Class aR Square Body Fuse, 200A 1250V

The Bussmann 170M4689 is a Class aR square body fuse rated 200A at 1250V, engineered for demanding DC power protection in industrial systems. Built in the -FU/115 US-style square body configuration without an indicator, this fuse delivers a 100 kAIC interrupt rating and is IEC rated with CE marking for use across DC common bus systems, DC drives, power converters/rectifiers, and reduced voltage starters. Its Class aR design provides fast-clearing, semiconductor-level protection where reliability under fault conditions is critical.

Key Features

  • Amperage & Voltage Rating: Rated 200A at 1250V for high-capacity DC circuit protection.
  • Class aR Design: Semiconductor-protection class fuse engineered for fast, reliable clearing in DC applications.
  • Interrupt Rating: 100 kAIC interrupt rating supports safe operation in high fault-current environments.
  • Fuse Indicator: Non-indicating, square body US-style construction in the -FU/115 configuration.
  • Clearing Characteristics: Clearing I2t of 22500 at 1000 V and 30000 at 1250 V, with a Pre-Arc I2t of 3800.
  • Watt Losses: Rated at 50 W for predictable thermal performance in enclosed equipment.
  • Application: Suited for DC common bus, DC drives, power converters/rectifiers, and reduced voltage starters.

Certifications & Compliance

  • IEC Rated
  • CE Marked

Technical Specifications

  • Amperage Rating: 200 A
  • Application: DC common bus, DC drives, power converters/rectifiers, reduced voltage starters
  • Certifications: IEC Rated
  • Class: Class aR
  • Clearing I2t: 22500 at 1000 V, 30000 at 1250 V
  • Compliances: CE Marked
  • Fuse Indicator: Non Indicating
  • Interrupt Rating: 100 kAIC
  • Packaging Type: Standard
  • Pre Arc I2t: 3800
  • Product Height: .001 mm
  • Product Length Depth: .001 mm
  • Product Weight: .586 g
  • Product Width: .001 mm
  • Voltage Rating: 1250 V
  • Watt Losses: 50 W
  • Product Type: Square body US style, -FU/115 without indicator
  • Product Details: Square body US style, -FU/115 without indicator

Typical Applications

  • DC Common Bus Systems
  • DC Drive Protection
  • Power Converters and Rectifiers
  • Reduced Voltage Starters
  • Industrial DC Power Distribution

Why Bussmann?

Bussmann fuses are engineered for dependable overcurrent protection in demanding industrial power systems. With a Class aR rating, a 100 kAIC interrupt rating, and IEC/CE compliance, the 170M4689 delivers the fast-clearing, semiconductor-grade protection professionals rely on for DC drive and power conversion equipment. Choose Bussmann for code-compliant performance built for critical electrical infrastructure.

Manufacturer Resources

Product Specs

Amperage Rating:
200 A
Certifications:
IEC Rated
Class:
Class aR
Clearing I2t:
22500 at 1000 V, 30000 at 1250 V
Compliances:
CE Marked
Fuse Indicator:
Non Indicating
Interrupt Rating:
100 kAIC
Packaging Type:
Standard
Pre Arc I2t:
3800
Product Height:
.001 mm
Product Length Depth:
.001 mm
Product Weight:
.586 g
Product Width:
.001 mm
Voltage Rating:
1250 V
Watt Losses:
50 W
Product Group:
Fuses
Department:
Electrical
Product Subgroup:
Square Body Fuses
Product Type:
Square body US style, -FU/115 without indicator
Product Details:
Square body US style, -FU/115 without indicator

Bussmann 170M4689 – Frequently Asked Questions

1) Will a Bussmann 170M4689 fuse protect a 1000V DC drive, or is it only for 1250V systems?
The 170M4689 is rated 1250V, so it can be applied at or below that on the circuits it is intended for. Bussmann publishes its clearing I2t at both levels: 22500 at 1000 V and 30000 at 1250 V. Use the 1000 V figure when you are coordinating let-through energy on a 1000V DC bus, and the 1250 V figure at full rating. Current rating is 200 A either way.
2) What does Class aR mean on the Bussmann 170M4689, and is it the right fuse for semiconductor protection?
Class aR is a semiconductor fuse class for partial-range protection, meaning it clears short circuit and high overcurrent faults fast but is not intended to handle low-level overloads on its own. The 170M4689 is built for that duty in DC common bus systems, DC drives, power converters and rectifiers, and reduced voltage starters. If your circuit also needs overload protection, that has to come from the drive's own protection or an upstream device.
3) Does the Bussmann 170M4689 have a blown-fuse indicator or microswitch?
No. The 170M4689 is the non-indicating version, built in the -FU/115 US-style square body configuration. There is no visual pin or microswitch to trigger a remote alarm contact, so if your panel relies on a fuse-monitoring input you need the indicating version of the 170M series instead, not this one.
4) What I2t numbers do I need to coordinate the Bussmann 170M4689 with my rectifier diodes or SCRs?
Two figures matter. Pre-arc (melting) I2t is 3800, and total clearing I2t is 22500 at 1000 V or 30000 at 1250 V. Compare the clearing value at your actual bus voltage against the I2t withstand rating of the semiconductor you are protecting; the device rating has to be higher than the fuse's clearing I2t or the diode fails before the fuse does.
5) Can I use the 170M4689 as a straight replacement for the fuse already in my DC drive?
Match it on four things before you pull the old one: 200 A rating, 1250 V, Class aR, and the -FU/115 US-style square body mounting with no indicator. If the fuse coming out is the indicating variant of the same size, the bolt pattern will match but you will lose the trip signal. If the existing part is a gR or gS full-range fuse, this partial-range aR is not a like-for-like swap.
6) How much heat does the Bussmann 170M4689 put into an enclosure?
Watt loss is 50 W at rated current. Add that into your panel heat calculation per fuse; three of them in a rectifier bridge is 150 W of dissipation before you count the drive itself. It matters most in sealed NEMA 4 enclosures where you are sizing a fan or air conditioner, and it is also why square body fuses need clear air space around the bus connections.
7) Is the Bussmann 170M4689 approved for European machinery builds?
It is IEC rated and CE marked, so it suits machinery exported to or built for European standards. For panels being listed to North American requirements, check that your listing agency accepts the IEC rating for that application, since the published certifications here are IEC and CE.
8) What is the exact Bussmann part number to order for a 200A 1250V square body aR fuse?
Order Bussmann 170M4689. That is the manufacturer part number for the 200 A, 1250 V Class aR square body fuse in the US-style -FU/115 body without an indicator. The 170M series runs many amp and body-size combinations that look alike on a shelf, so quote the full number rather than the amp rating alone.
How fast can I get the Bussmann 170M4689 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 170M4689 come with a warranty?
Absolutely. The Bussmann 170M4689 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 170M4689?
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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