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Bussmann 170M3812D Class aR Semiconductor Fuse, 100A
The Bussmann 170M3812D is a Class aR semiconductor protection fuse rated 100A at 690V AC, engineered for accompanied semiconductor protection (aR utilization category) in demanding industrial power circuits. It delivers a 200 kAIC interrupt rating with DIN 43-620 blade end x DIN 43-620 blade end knife blade connections, and is IEC rated and CE marked for use in compliant industrial control and power electronics installations.
Key Features
- Amperage & Voltage Rating: 100 A at 690 V AC for high-power industrial circuits.
- Class aR Construction: Utilization Category aR (accompanied semiconductor protection) shields sensitive semiconductor devices from short-circuit fault currents.
- Interrupt Rating: 200 kAIC high interrupting capacity supports coordinated protection in high-fault-current systems.
- Connection & Fuse Shape: Din 43-620 blade end x Din 43-620 blade end knife blade contacts in a square body fuse shape for standard fuse-holder compatibility.
- Fuse Indicator: Combination fuse status indicator for quick visual confirmation of a blown fuse.
- Let-Through Energy: Clearing I2t of 2600 at 660 V and Pre-Arc I2t of 360 for precise protective coordination.
- Watt Losses: 10 W power dissipation rating.
- Compact Dimensions: 135 mm length/depth x 64 mm height x 40 mm width, approximately 423.17 g.
Certifications & Compliance
- IEC Rated
- CE Marked
Technical Specifications
- Amperage Rating: 100 A
- Certifications: IEC Rated
- Class: Class aR
- Clearing I2t: 2600 at 660 V
- Compliances: CE Marked
- Connection: Din 43-620 blade end x Din 43-620 blade end
- Fuse Indicator: Combination fuse status indicator
- Fuse Shape: Square body, knife blade contacts
- Insulated Metal Gripping Lugs (Imgl): No
- Interrupt Rating: 200 kAIC
- Pre Arc I2t: 360
- Product Height: 64 mm
- Product Length Depth: 135 mm
- Product Weight: 423.1666667 g
- Product Width: 40 mm
- Utilization Category: aR (accompanied semiconductor protection)
- Voltage Rating: 690 V
- Voltage Type: AC
- Watt Losses: 10 W
Typical Applications
- Semiconductor Device Protection
- Power Electronics and Variable Frequency Drives
- Industrial Motor Control Circuits
- Rectifier and Converter Protection
- Panelboard and Switchgear Installations
Why Bussmann?
Bussmann engineers the 170M3812D to Class aR standards with a 200 kAIC interrupt rating, DIN 43-620 blade end connections, and a combination fuse status indicator for fast field verification. Backed by IEC rating and CE marking, it delivers dependable, code-compliant semiconductor protection for professional industrial power applications.
Manufacturer Resources
Product Specs
- Amperage Rating:
- 100 A
- Application:
- industrial
- Certifications:
- IEC Rated
- Class:
- Class aR
- Clearing I2t:
- 2600 at 660 V
- Compliances:
- CE Marked
- Connection:
- Din 43-620 blade end x Din 43-620 blade end
- Fuse Indicator:
- Combination fuse status indicator
- Fuse Shape:
- Square body, knife blade contacts
- Insulated Metal Gripping Lugs Imgl:
- No
- Interrupt Rating:
- 200 kAIC
- Packaging Type:
- Standard
- Pre Arc I2t:
- 360
- Product Height:
- 64 mm
- Product Length Depth:
- 135 mm
- Product Weight:
- 423.1666667 g
- Product Width:
- 40 mm
- Utilization Category:
- aR (accompanied semiconductor protection)
- Voltage Rating:
- 690 V
- Voltage Type:
- AC
- Watt Losses:
- 10 W
- Product Group:
- Fuses
- Department:
- Electrical
- Product Subgroup:
- Other Fuses
- Product Type:
- Fuse
- Product Details:
- Fuse
Bussmann 170M3812D – Frequently Asked Questions
1) Will a Bussmann 170M3812D fuse protect a drive on a 480V or 600V system?
Yes. The 170M3812D is rated 690 V AC, so it covers 480 V and 600 V AC circuits within that ceiling. It carries a 200 kAIC interrupting rating, which is what you want ahead of a drive or rectifier fed from a stiff service. Note it is an AC-rated part at 690 V; if your application is a DC link, you need a fuse with a published DC rating.
2) What is the difference between an aR semiconductor fuse and a gR or standard industrial fuse?
aR stands for accompanied semiconductor protection, which is the utilization category of the 170M3812D. It only protects against short circuit fault current, so it has to be used alongside another device (a breaker or overload relay) that handles overload. A gR or gS type is a full-range fuse that covers both overload and short circuit on its own. If your panel has no separate overload protection on that branch, an aR fuse by itself is not enough.
3) Will the 170M3812D bolt into my existing DIN blade fuse holder?
It uses DIN 43-620 blade ends on both sides, square body with knife blade contacts, so it lands in a standard DIN 43-620 mounting base or bus bar arrangement for that size. Overall it measures 135 mm length/depth, 64 mm height and 40 mm width, so check your holder centers and the 40 mm blade spacing clearance before ordering. There are no insulated metal gripping lugs on this one.
4) What I2t values do I need for coordinating this fuse with my SCRs or diodes?
For the 100 A 170M3812D, pre-arc I2t is 360 and clearing I2t is 2600 at 660 V. Compare the clearing value against the I2t withstand of the SCR or diode you are protecting: the device rating has to exceed 2600 at your working voltage or the semiconductor lets go before the fuse does. Let-through drops at lower system voltages.
5) Can I use this fuse as branch circuit protection for a motor feeder?
No, not on its own. The 170M3812D is an aR semiconductor fuse, meaning it is built to clear short circuit faults fast enough to save power electronics, not to carry motor starting duty or open on a sustained overload. Use it inside a drive, rectifier or converter to protect the silicon, and keep a breaker or overload device for branch and overload protection.
6) How much heat does this 100A semiconductor fuse put into the enclosure?
Watt loss is 10 W at rated current. Multiply by the number of fuses in the cabinet when you size ventilation or figure a derating for an enclosed, poorly ventilated base. Semiconductor fuses of this type also lose current-carrying capability at elevated ambient, so a fully loaded three-phase set is 30 W of added heat before anything else in the panel.
7) Can a technician tell at a glance whether a 170M3812D has blown?
Yes. It has a combination fuse status indicator, so a blown element shows visually on the fuse body, and the combination style also allows a microswitch to be actuated for remote indication where the base supports one. That matters on a drive cabinet where one open phase is otherwise hard to find.
8) Is the Bussmann 170M3812D approved for use in a CE-marked industrial panel in Europe?
It is IEC rated and CE marked, which is what an OEM needs for a machine panel built to European requirements. Those are the ratings stated for this fuse; if your job also calls for a North American listing on the fusing, verify that separately against the project spec.
9) What is the correct part number and weight for ordering a 100A Bussmann 170M size DIN fuse?
The manufacturer part number is 170M3812D, a 100 A, 690 V AC Class aR square body fuse weighing about 423 g. The trailing D is part of the number and reflects the blade and indicator configuration, so do not substitute a 170M3812 variant without confirming the suffix matches what came out of the holder.
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Does the Bussmann 170M3812D come with a warranty?
Absolutely. The Bussmann 170M3812D is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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