Eaton DCU1104FXM DC Disconnect - NEMA 4X 1000VDC
Part Number: DCU1104FXM
Quick Summary
Eaton DCU1104FXM is a heavy-duty DC disconnect designed for solar PV systems. Engineers often struggle with enclosure integrity and high-current protection in outdoor or harsh environments. This unit combines a 316 stainless steel NEMA 4X enclosure with fusible protection, meeting NEC 690 per UL 1741 and UL 98B requirements. Its 200 A amperage rating and 1000 VDC system voltage support large photovoltaic arrays while providing safe, code-compliant isolation. By choosing a purpose-built DC disconnect, you reduce maintenance, optimize uptime, and simplify field wiring for LC SR EG conductor configurations. This product also aligns with solar electrical protection best practices, delivering durable performance in challenging sites while supporting long-term operating cost reductions.
Product Information
Extended Description
DCU1104FXM Eaton: Eaton Heavy duty DC disconnect, 200 A, NEMA 4X, Grade 316 stainless steel, Fusible, LC: In 300 MCM-#6 out 300 MCM-#6. SR: in 300 MCM-#6 out 300 MCM-#6. EG: in #4-#14 AWG out 1/0-#14, Max:1000 Vdc, NEMA 4X, 1, Fusible, System:1000 Vdc
Product Name
Eaton heavy duty DC disconnect
Catalog Number
DCU1104FXM
UPC
786685625690
Product Length/Depth
35.38 in
Product Height
11.63 in
Product Width
16.54 in
Product Weight
45 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
NEC 690 per UL 1741 UL 98B
Type
DC disconnect/ungrounded system
Amperage Rating
200 A
Number of circuits
1
Maximum voltage
1000 VDC
NEMA rating
NEMA 4X
Protection
Fusible
Application
Solar
Main lug wire size
LC: In 300 kcmil-#6 out 300 kcmil-#6. SR: in 300 kcmil-#6 out 300 kcmil-#6. EG: in #4-#14 AWG out 1/0-#14
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
A 200 A amperage rating with a single circuit configuration provides direct isolation for a PV string or DC bus. This reduces arc flash exposure during maintenance and enables code-compliant shutdowns. In practice, crews experience shorter lockout times and fewer field modifications when wiring remains within the unit’s defined LC SR EG conductor ranges. The NEMA 4X enclosure in 316 stainless steel delivers outdoor durability and corrosion resistance, lowering maintenance frequency and extending service life in coastal or industrial environments. Fusible protection simplifies NEC 690 compliance and provides predictable fault containment, enhancing system reliability and safety. With a 1000 VDC maximum rating, the disconnect supports modern, high-voltage PV deployments while preserving safe operation. Conductor sizing compatibility (LC SR EG) enables flexible field wiring, reducing splice points and labor during installation. The Eaton design also offers straightforward integration with existing protection schemes and a clear path to long-term cost efficiency through reduced downtime and simpler maintenance.
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FAQs
DCU1104FXM is designed for solar PV installations requiring safe isolation of a single DC circuit. It handles 200 A with a 1000 VDC rating and uses fusible protection. Main conductor sizing options include LC: In 300 kcmil-#6 out 300 kcmil-#6, SR: in 300 kcmil-#6 out 300 kcmil-#6, and EG: in #4-#14 AWG out 1/0-#14, making it suitable for mid-string or inverter input protection in outdoor enclosures.
Key specifications include 200 A amperage rating, 1 circuit, maximum voltage of 1000 VDC, fusible protection, and a NEMA 4X enclosure. It is designed for solar applications and supports LC SR EG conductor configurations, enabling straightforward field wiring and reliable protection of DC power paths.
Yes. The DCU1104FXM uses a 316 stainless steel enclosure rated NEMA 4X, which provides excellent corrosion resistance and weatherproof protection. This makes it well-suited for outdoor rooftop and ground-mounted solar installations where exposure to the elements is a concern.
The device is designed to meet NEC 690 requirements per UL 1741 and UL 98B, ensuring compliance for solar DC protection and overcurrent protection. Its NEMA 4X enclosure complements these certifications by supporting reliable outdoor operation with corrosion resistance.
Eaton offers a warranty per policy 25-000: one year from installation or eighteen months from shipment, whichever occurs first. This aligns with the product’s robust construction (316 stainless steel, fusible protection) to minimize downtime and support long-term maintenance planning.