Eaton DCU1105FXM DC Disconnect - NEMA 4X 1000 VDC
Part Number: DCU1105FXM
Quick Summary
DC Disconnect DCU1105FXM provides a heavy-duty ungrounded switch for solar PV systems. Engineers often struggle with corrosion, harsh environments, and reliable isolation under high DC voltages. This model leverages UL Listed certification, a NEMA 4X enclosure, and a 316 stainless steel enclosure to withstand outdoor exposure. The fusible protection enhances safety while simplifying maintenance, and its 400 A rating with 1000 VDC capability supports scalable solar deployments for industrial facilities and utility-scale projects. In short, it delivers robust isolation, long-term reliability, and cost-effective protection for critical DC power paths.
Product Information
Extended Description
DCU1105FXM Eaton: Eaton Heavy duty DC disconnect, DCU, 400 A, DC photovoltaic systems, Grade 316 stainless steel, Fusible, Max:1000 Vdc, NEMA 4X, 1, Fusible
Product Name
Eaton heavy duty DC disconnect
Catalog Number
DCU1105FXM
UPC
786685866246
Product Length/Depth
12.43 in
Product Height
57.47 in
Product Width
24.12 in
Product Weight
120.5 lb
Warranty
Eaton Selling Policy 25-000, one (1) year from the date of installation of the Product or eighteen (18) months from the date of shipment of the Product, whichever occurs first.
Certifications
UL Listed
Type
DC disconnect/ungrounded system
Amperage Rating
400 A
Number of circuits
1
Maximum voltage
1000 VDC
NEMA rating
NEMA 4X
Protection
Fusible
Application
Solar
System voltage
1000 VDC
Voltage rating
1000 VDC
Series
DC photovoltaic applications
Enclosure
NEMA 4X
Enclosure material
316 stainless steel
Fuse configuration
Fusible
Switch type
Heavy duty
Protection
Fusible
Feature → Business Impact → Application: The DCU1105FXM delivers fusible protection in a heavy-duty DC disconnect, reducing arc flash risk and enabling safer maintenance windows for PV strings and battery storage arrays. This translates to improved compliance, lower incident-related downtime, and faster commissioning in commercial solar installations. Feature → Business Impact → Application: A 316 stainless steel, NEMA 4X enclosure provides superior corrosion resistance and weatherproofing, extending service life in harsh outdoor environments and minimizing replacement costs in remote solar farms. Feature → Business Impact → Application: With a 12.43 in depth, 24.12 in width, and 57.47 in height footprint and a 120.5 lb weight, the unit fits standard electrical rooms and outdoor skid mountings, enabling straightforward retrofit and scalable power isolation. Feature → Business Impact → Application: Operating up to 1000 VDC and 400 A across a single circuit, it supports utility-scale and commercial PV systems, reducing the need for multiple devices and simplifying protection schemes. Feature → Business Impact → Application: The product’s UL Listed status, fusible configuration, and 1000 VDC rating help meet safety and utility guidelines, while the 1‑year warranty adds total-cost-of-ownership confidence for integrators and service teams. Feature → Business Impact → Application: Easy installation and compatibility with existing Eaton protection platforms streamline procurement, stock management, and field support, delivering faster project schedules and lower lifecycle costs in industrial electrical protection programs.
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FAQs
The DCU1105FXM should be mounted in a suitable enclosure space with access for maintenance, ensuring proper ventilation and clearances per the NEMA 4X rating. Wire to a single 1‑circuit configuration, use fusible protection per specification, and comply with UL Listed installation practices. Allow for serviceability, inspection of fuse elements, and periodic testing of isolation functionality within PV arrays.
The unit is rated for 400 A and 1000 VDC, designed as a single-circuit DC disconnect with fusible protection. This makes it suitable for isolating solar strings, PV arrays, and associated DC power paths, while meeting safety and protection requirements for medium to large solar installations.
Yes. The device is designed for solar PV applications, offering a 1000 VDC maximum system voltage and 400 A capacity within a rugged, corrosion-resistant NEMA 4X enclosure. Its fusible protection supports safe isolation for grid-tied PV systems, battery storage, and related DC infrastructure, provided installation adheres to applicable standards.
DCU1105FXM carries UL Listed certification and a NEMA 4X enclosure rating, with 316 stainless steel construction for outdoor durability. These specifications matter because UL Listing confirms safety compliance, NEMA 4X ensures weatherproofing and corrosion resistance, and the material choice supports long-term reliability in harsh environments typical of solar installations.
Eaton provides a one-year warranty from installation or eighteen months from shipment, whichever comes first, under policy 25-000. Routine maintenance should include visual inspection of the enclosure, fuse status checks, and testing of isolation functionality. Keeping spare fuse elements on hand and documenting service events can help maximize uptime and optimize lifecycle costs.