Bussmann KTU-1800 Eaton series KTU fuse, LIMITRON Fast-acting fuse, 1800 A, Class L, Non-indicating, Bolted blade end x bolted blade end, 200 kAIC at 600 Vac, Melamine glass tube,Silver-plated end bells, Bolt, Standard, 600 V.
- Amp rating: 1800 A
- Voltage rating: 600 V
- Class: Class L
- Interrupt rating: 200 kAIC at 600 Vac
- Product type: Fuse
- Dimensions (L x W x H): 10.75 x 3.5 x 3.5 in
Genuine Bussmann part number KTU-1800.
Manufacturer Resources
Product Specs
- Amperage Rating:
- 1800 A
- Class:
- Class L
- Compliances:
- RoHS Compliant
- Connection:
- Bolted blade end x bolted blade end
- Fuse Indicator:
- Non-indicating
- Interrupt Rating:
- 200 kAIC at 600 Vac
- Mounting Method:
- Bolt
- Packaging Type:
- Standard
- Product Height:
- 3.5 in
- Product Length Depth:
- 10.75 in
- Product Weight:
- 7.82 lb
- Product Width:
- 3.5 in
- Voltage Rating:
- 600 V
- Department:
- Electrical
- Product Material:
- Silver-plated end bells
- Product Type:
- Fuse
- Product Group:
- Fuses
- Product Subgroup:
- Other Fuses
Bussmann KTU-1800 – Frequently Asked Questions
1) Will a Bussmann KTU-1800 fit a Class L fuse holder in a 1800 amp switch?
The KTU-1800 is a Class L fuse with bolted blade ends on both ends, so it lands in standard Class L bolt-in mountings rated 1800 A at 600 V. Class L bodies are dimensionally standardized by amp rating, and this one measures 10.75 in long by 3.5 by 3.5 in. Check that your switch or bus bracket is drilled for a 1800 A Class L blade, not a lower amp rating, because the blade hole spacing changes with amperage.
2) Can I use a KTU-1800 on a 480V or 240V system, or is it 600V only?
600 V is the maximum rating on the KTU-1800, and a fuse can always be applied at or below its voltage rating. So it works on 600, 480, 240 or 208 V AC systems. What you cannot do is put it on anything above 600 V. The 200 kAIC interrupting rating is stated at 600 Vac.
3) Is the KTU a fast-acting fuse or a time-delay fuse for motor loads?
KTU is the LIMITRON fast-acting Class L line, with no intentional time delay. That makes it suited to circuits without heavy inrush, like main switchboard feeders and non-motor loads. If you are protecting a large motor or a transformer that draws big inrush on startup, a fast-acting 1800 A fuse can nuisance open, and you want a time-delay Class L instead.
4) Does the Bussmann KTU-1800 have a blown fuse indicator?
No. The KTU-1800 is non-indicating, so there is no pop-out pin or visual flag to tell you it has opened. On a 1800 A main you will need to confirm an open fuse with a meter across the fuse or with separate blown-fuse monitoring in the switch.
5) What part number do I order to replace an existing KTU 1800 amp fuse?
Order Bussmann KTU-1800, the Eaton Bussmann series KTU LIMITRON fast-acting Class L fuse rated 1800 A, 600 V. If the fuse you pulled is stamped KTU-1800, this is the direct like-for-like replacement, same bolted blade connection and same body size.
6) How does the KTU-1800 mount in the switch?
It bolts in. Both ends are bolted blades that fasten directly to the bus or fuse block, which is standard for Class L above 600 A, as opposed to the ferrule or knife-blade clips used on smaller Class J and Class RK fuses.
7) What do the silver-plated end bells on the KTU-1800 do?
The blade terminations are silver-plated, which keeps contact resistance low and limits oxidation at the bolted joint. That matters at 1800 A, where a poor or corroded connection heats up fast. Torque the bolts to the switch manufacturer's value and keep the mating bus surfaces clean.
8) How heavy is a 1800 amp Class L fuse, and is it a one-person change out?
Each KTU-1800 weighs 7.82 lb and runs 10.75 in long by 3.5 by 3.5 in. One person can handle a single fuse, but changing all three phases in a live-adjacent switchboard is awkward work in a tight cabinet, and the bolts need to be reached and torqued from the front. Plan the outage accordingly.
9) Is the Bussmann KTU-1800 RoHS compliant for our facility spec?
Yes, the KTU-1800 is listed as RoHS compliant, which typically covers institutional and government procurement specs that require restricted-substance conformity on electrical components.
How fast can I get the Bussmann KTU-1800 delivered?
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Does the Bussmann KTU-1800 come with a warranty?
Absolutely. The Bussmann KTU-1800 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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