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Eaton Fuse Block for Class CC (KTK-R) Rejection Fuses, 30A
The Eaton Fuse Block is a 30A-rated fuse holder engineered for use with Class CC rejection type fuses (KTK-R), providing a secure, code-compliant mounting point for overcurrent protection in control panels, machinery, and motor control circuits. This fuse block ships with a 5 Amp, 600V KTK-R fuse installed, and its rejection-style design ensures only proper Class CC fuses can be inserted, preventing misapplication with non-rejection fuse types. Compact in footprint at 1.19 in wide, 1.88 in deep, and 2.06 in tall, it is cUL Listed and built to meet MIL-S-83731 specifications for demanding industrial and commercial environments.
Key Features
- Amperage Rating: Rated for 30A, suitable for branch circuit and motor control protection applications.
- Fuse Compatibility: Designed for use with Class CC rejection type fuses (KTK-R), ensuring only correct fuse types can be installed.
- Included Fuse: Comes with a 5 Amp, 600V KTK-R fuse pre-installed for immediate use.
- Compact Dimensions: Product width of 1.19 in, length/depth of 1.88 in, and height of 2.06 in for space-efficient panel mounting.
- Accessory Type: Functions as a dedicated fuse holder accessory within a larger fused disconnect or control assembly.
- Backed Reliability: Covered by a 1 year manufacturer warranty for peace of mind on installation.
Certifications & Compliance
- cUL Listed
- Meets MIL-S-83731 specifications
Technical Specifications
- Product Width: 1.19 in
- Product Length/Depth: 1.88 in
- Product Height: 2.06 in
- Amperage Rating: 30A
- Used with: Class CC rejection type fuses (KTK-R)
- Catalog Notes: Includes a 5 Amp, 600V KTK-R fuse
- Certifications: cUL Listed
- Compliances: Meets MIL-S-83731 specifications
- Type: Accessory
- Warranty: 1 year
- Department: Electrical
Typical Applications
- Motor Control and Protection Panels
- Industrial Machinery Overcurrent Protection
- Commercial Electrical Control Systems
- Fused Disconnect and Switch Assemblies
- Panelboard and Equipment Retrofit Projects
Why Eaton?
Eaton engineers this fuse block to deliver dependable, code-compliant overcurrent protection backed by cUL Listing and compliance with MIL-S-83731 specifications. With a rejection-style design that pairs specifically with Class CC (KTK-R) fuses, plus a pre-installed 5 Amp, 600V fuse and a 1 year warranty, it offers electrical professionals a reliable, ready-to-install solution for control and motor protection circuits.
Manufacturer Resources
Product Specs
- Warranty:
- 1 year
- Department:
- Electrical
- Certifications:
- cUL Listed
- Product Type:
- Fuse Block
- Amperage Rating:
- 30A
- Listing:
- cUL Listed
- Standards:
- MIL-S-83731
- Product Group:
- Circuit Protection
- Product Subgroup:
- Fuse Holders & Blocks
Eaton C320FBR – Frequently Asked Questions
1) Is this Eaton fuse block acceptable for a military or defense spec control panel?
It is built to meet MIL-S-83731 specifications and is cUL Listed, which is what most defense and heavy industrial submittals ask for on a fuse holder. Cite the Eaton C320FB model number plus MIL-S-83731 on your submittal package.
2) What is the alternative if the panel uses Class R fuses instead of Class CC?
The Eaton C320FB fuse block is a rejection-style holder built specifically for Class CC (KTK-R) fuses at 30A, so a Class R fuse will not seat in it. For a Class R opening at the same current, the Littelfuse LFR60030-3CID is a Class R fuse block rated 600V, 30A. Match the block to the fuse class the drawing calls out, since rejection features are what keep the wrong class out.
3) Can I use this fuse block on a solar DC string circuit?
No. The Eaton C320FB is a Class CC (KTK-R) rejection fuse block rated 30A for AC control, machinery and motor circuits. Photovoltaic string protection uses a dedicated DC block such as the Bussmann CHPV2 Series modular two-pole photovoltaic fuse block rated 1000 Vdc. The two are not interchangeable despite both being fuse blocks.
4) Does the Eaton C320FB fuse block come with a fuse in it?
It ships with a 5 Amp, 600V KTK-R fuse already installed. That is a starter fuse, not necessarily the one your circuit needs. The block itself is rated 30A, so you can swap in any Class CC KTK-R rating up to 30A to match your branch or motor control circuit.
5) How much panel space does the Eaton 30A Class CC fuse block take up?
The footprint is 1.19 in wide, 1.88 in deep, and 2.06 in tall. Worth checking the height against your wireway and cover clearance in a shallow control enclosure, since 2.06 in is the tallest dimension.
6) Can I use this for motor control circuit protection?
That is one of its intended uses. Class CC KTK-R fast-acting fuses in a 30A rejection block are common for motor control and branch circuit protection in control panels, machinery, and fused disconnect assemblies. The rejection throat also stops a tech from dropping in a lower-interrupting non-rejection fuse during a service call.
7) For a bolt-in feeder block instead of a small control-circuit holder, what should I look at?
The Littelfuse LD Series POWR-BLOKS fuse block uses bolt-in mounting, which suits larger feeder and distribution terminations. The Eaton C320FB is a compact 30A Class CC (KTK-R) holder aimed at control panels and motor control circuits. Choose by the fuse class and termination style the assembly requires.
8) Is there a fuse block option that mounts on DIN rail rather than panel-mounting?
The Littelfuse LFG60015-1SQDINR is a DIN rail mount fuse block, rated 600V 15A for Class G fuses. The Eaton C320FB is a Class CC (KTK-R) rejection block rated 30A. If the enclosure is laid out around DIN rail and the circuit is a 15A Class G design, the Littelfuse is the direct fit; if the spec calls for Class CC rejection at 30A, stay with the Eaton.
9) What is the difference between the C320FB1 and the C320FBR versions of this Eaton fuse block?
Both are orderable models on the same Eaton C320FB 30A Class CC fuse block: C320FB1 and C320FBR. Specify by that model number on the order so you get the configuration your panel drawing calls out.
How fast can I get the Eaton C320FBR delivered?
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Can I return it if it doesn’t work for me?
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reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Eaton C320FBR come with a warranty?
Absolutely. The Eaton C320FBR is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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