Eaton KTN-R-500 Fuse - Class RK1, 200 kAIC at 250 Vac
Part Number: KTN-R-500
Quick Summary
The Eaton KTN-R-500 fuse provides fast-acting current-limiting protection for electrical panels and industrial machinery. Engineers often struggle with nuisance trips, miscoordination at high fault currents, and space-constrained installations that complicate protection schemes. Key ratings include Class RK1 construction with a 200 kAIC interrupt rating at 250 Vac and a 500 A amperage rating, plus a 250 Vac / 250 Vdc voltage rating. This combination delivers reliable protection while simplifying procurement and maintenance for panel builders, machine integrators, and service teams, thanks to blade-end connections, a compact 10.38 in form factor, and robust 70/30 brass end caps. The result is reduced downtime, clearer spares planning, and a safer, more predictable protection strategy across automation assets.
Product Information
Extended Description
KTN-R-500 Eaton: Eaton Bussmann Series Class RK1 fuse, KTN-R, fast-acting, current limiting fuse, 500 A, rejection style fuse, interrupting rating of 200 kA at 250 Vac
Product Name
Eaton Bussmann series KTN-R fuse
Catalog Number
KTN-R-500
UPC
051712407274
Product Length/Depth
10.38 in
Product Height
2.59 in
Product Width
2.59 in
Product Weight
3.25 lb
Warranty
Not Applicable
Compliances
Not Applicable
Amperage Rating
500 A
Interrupt rating
200 kAIC at 250 Vac 100 kAIC at 250 Vdc
Voltage rating
250 Vac, 250 Vdc
Material
Melamine glass tube
Number of elements
1
Packaging type
Standard
Class
Class RK1
Connection
Blade end x blade end
Fuse indicator
Non-indicating
Special features
70/30 brass end cap
Bussmann Full Line Catalog
Bussmann Full Line Catalog
RoHS Search Tool
Bussmann series Fuseology
Bussmann series KTN-R 250 V Class R fuse data sheet no. 1043
The KTN-R-500 is a fast-acting, current-limiting fuse in the Bussmann RK1 family. This feature reduces energy discharged during faults, protecting downstream wiring and components, which translates to shorter downtime and lower replacement costs in control panels and power distribution nodes. It is well-suited for use in panel boards and machine interfaces where quick fault clearing is essential. The fuse delivers an interrupt rating of 200 kAIC at 250 Vac and 100 kAIC at 250 Vdc, providing high fault tolerance for high-energy circuits while minimizing arc energy and equipment damage in automation installations. With a 500 A amperage rating and a 250 Vac/250 Vdc voltage rating, it supports heavy current loads in industrial settings without exceeding safe operating margins. The rejection-style housing and blade-end x blade-end connections prevent mis-insertion and simplify installation in crowded panels, reducing commissioning time and maintenance risk. The 70/30 brass end caps improve terminal connectivity, lowering contact resistance and heating under fault conditions, which enhances long-term reliability in demanding environments. The melamine glass tube construction, single element design, and non-indicating fuse indicator balance durability with straightforward field service checks, minimizing routine maintenance while preserving predictable performance. At 10.38 in long, 2.59 in high, and 2.59 in wide, the device fits typical RK1 footprints and aligns with standard enclosure layouts, aiding space planning and replacement workflows for electricians and technicians.
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FAQs
Install the KTN-R-500 into a standard RK1 fuse holder with blade-end connections, ensuring correct alignment to prevent mis-insertion. Verify the panel bus bars and terminal blocks can accommodate a 10.38 inch long fuse and comply with enclosure clearance. Use proper PPE and confirm that conductor sizes and housing temperatures remain within spec. After seating, perform a continuity check and verify the circuit protection coordination with upstream protections.
The KTN-R-500 provides a 500 A amperage rating, a 200 kAIC interrupt rating at 250 Vac and 100 kAIC at 250 Vdc. It has a voltage rating of 250 Vac and 250 Vdc, uses a single-element melamine glass tube, and employs blade-end x blade-end connections. This combination supports high-energy circuits while maintaining safe trip characteristics and coordination with upstream protective devices.
Yes, the KTN-R-500 is well-suited for motor feeders and machine control circuits in industrial automation due to its fast-acting current-limiting action and high interrupt ratings. Its Class RK1 construction and robust end-cap design help protect motors, starters, and feeders from damaging fault currents while minimizing nuisance trips, enabling reliable system startup and operation.
The provided data does not explicitly list CE or RoHS certifications; it notes Class RK1 and related ratings. For compliance verification, consult Eaton's RoHS tool and official RoHS/CE documentation linked in the product downloads to confirm current status and any regional requirements before procurement.
Maintenance benefits stem from predictable fault protection and a non-indicating design that reduces unnecessary visual inspections. The high interrupt rating and durable construction lower the risk of cascading faults, which translates to reduced downtime and longer intervals between fuse replacements. In ROI terms, reliable protection lowers maintenance costs and extends equipment life in automated production lines.