Eaton DCU3104URM DC Disconnect - NEMA 3R 1000 VDC
Part Number: DCU3104URM
Quick Summary
Eaton DCU3104URM DC disconnect delivers a rugged, non-fusible solution for solar DC systems up to 1000 VDC. Project teams struggle with outdoor deployments where weather exposure, bulky conductors, and difficult access slow maintenance and raise safety risk. Certified to NEC 690 per UL 1741 and UL 98B with a NEMA 3R enclosure, it stands up to outdoor service in harsh industrial environments. Designed for solar applications, it combines robust protection with straightforward wiring and fast installation, helping owners lower lifecycle costs. The unit is compatible with LC, SR, and EG wiring configurations, enabling scalable PV projects while reducing engineering risk on site.
Product Information
Extended Description
DCU3104URM Eaton: Eaton Heavy duty DC disconnect, 200 A, NEMA 3R, Stainless steel, Non-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 3R, 3, Non-fusible, System:1000 Vdc
Product Name
Eaton heavy duty DC disconnect
Catalog Number
DCU3104URM
UPC
786685625621
Product Length/Depth
11.63 in
Product Height
35.38 in
Product Width
24.46 in
Product Weight
70 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
3
Maximum voltage
1000 VDC
NEMA rating
NEMA 3R
Protection
Non-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 3R
Enclosure material
Painted galvanized steel
Fuse configuration
Non-fusible
Switch type
Heavy duty
Protection
Non-fusible
With a 200 A amperage rating and three circuits, the DCU3104URM provides substantial current capacity for solar arrays while maintaining straightforward isolation. This enables designers to consolidate partitions and reduce device count in the field, lowering installation time. The non-fusible design simplifies protection coordination and improves fault analysis during commissioning. In practice, that means faster energization and safer maintenance windows. The NEMA 3R enclosure protects contacts from rain, dust, and corrosion, enabling reliable outdoor use without extra protective housings. Painted galvanized steel delivers durable, weather-resistant performance in harsh industrial environments. For panel layouts and mounting, the rugged enclosure also aids compliant routing of wiring and straightforward service access. Rated for 1000 VDC and non-fusible, it isolates high-energy solar circuits safely without nuisance fusing. This minimizes arc flash exposure and simplifies lockout/tagout procedures during service. The unit supports flexible wiring configurations, reducing field wiring complexity and enabling quicker panel retrofits. Consolidating the disconnect and wiring in a compact footprint also helps meet tight space constraints on rooftops or ground-mounted arrays. Main lug wire sizes accommodate LC in 300 kcmil-#6, SR in 300 kcmil-#6, and EG in #4-#14 in and 1/0-#14 out. This versatility reduces on-site splices, lowers inventory needs, and supports common solar string layouts with diverse conductor types. The design promotes easier installation, shorter commissioning times, and fewer call-backs due to improper terminations. Certifications NEC 690 per UL 1741 and UL 98B confirm suitability for PV applications and ensure code compliance. The NEMA 3R-rated enclosure plus rugged hardware deliver environmental protection for outdoor sites, reducing maintenance and outage risk. Eaton backs the product with a one-year warranty and a clear service policy, helping owners predict maintenance budgets and minimize lifecycle costs.
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FAQs
The DCU3104URM is designed for outdoor PV installations with a NEMA 3R enclosure, enabling surface or wall mounting in harsh environments. Installers should verify proper alignment with the array, connect feeders to the main lugs using approved cables within the LC, SR, or EG configurations, and ensure lockout/tagout procedures are in place before energizing. The unit supports straightforward wiring and minimizes field splice points, accelerating commissioning and reducing field risk.
Main lug connections accept LC: 300 kcmil-#6 in/out, SR: 300 kcmil-#6 in/out, and EG: in #4-#14 AWG in to 1/0-#14 out. This range supports large feeder conductors for PV strings and smaller control wiring, reducing on-site splicing and inventory needs while enabling flexible stringing layouts for rooftop or ground-mounted solar installations.
Yes. The device is specified for solar applications with NEC 690 compliance as referenced by UL 1741, and it aligns with UL 98B for electrical protection. The NEMA 3R outdoor enclosure further supports compliance in exposed environments, ensuring safe isolation, reliable operation, and code-conforming installations across commercial and industrial PV projects.
A non-fusible DC disconnect provides a safe, short-path means to isolate PV arrays without the risk of a fuse blowing during routine maintenance. It simplifies lockout/tagout procedures, reduces arcing potential, and enables quick energization/de-energization cycles. For solar systems with multiple strings or high-current arrays, this design improves service efficiency and protects personnel during troubleshooting.
Benefits include reduced maintenance downtime due to faster isolation and servicing, lower field wiring complexity from flexible lug configurations, and durable outdoor performance with a NEMA 3R enclosure. The unit’s 200 A rating and 1000 VDC capability support scalable PV deployments, while compliance with NEC 690 and UL standards minimizes regulatory risk and total cost of ownership over the system lifetime.