Eaton DCU1103UWM DC Disconnect - NEMA 4X 1000 Vdc
Part Number: DCU1103UWM
Quick Summary
Eaton heavy duty DC disconnect enables safe, reliable DC isolation for solar PV systems. Engineers often face weather exposure, space constraints, and complex wiring layouts that slow commissioning and increase risk. This unit offers NEC 690 compliance per UL 1741, UL 98B enclosure integrity, and a NEMA 4X stainless steel build to withstand harsh outdoor environments. With 100 A capacity and 1000 Vdc rating, it supports scalable PV installations while delivering rugged reliability, straightforward installation, and lower lifecycle costs for your solar projects. Built for ungrounded, non-fusible operation, it aligns with modern PV safety practices and simplifies system integration with #14-1/0 AWG lugs and solid returns.
Product Information
Extended Description
DCU1103UWM Eaton: Eaton Heavy duty DC disconnect, 100 A, NEMA 4X, Grade 304 stainless steel, Non-fusible, Ungrounded, #14-1/0 AWG lug capacity, #14-1/0 AWG solid return, 1, DC photovoltaic applications, Rating:1000 Vdc
Product Name
Eaton heavy duty DC disconnect
Catalog Number
DCU1103UWM
UPC
786685557984
Product Length/Depth
10.22 in
Product Height
24.95 in
Product Width
11.79 in
Product Weight
24 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
Catalog Notes
Not all configurations for ampere rating and number of circuits are available. All circuit configurations can be found in the product dimension tables.
Type
DC disconnect/ungrounded system
Amperage Rating
100A
Number of circuits
1
Ground
Ungrounded
Protection
Non-fusible
Application
Solar
Main lug wire size
#14-1/0 AWG lug capacity, #14-1/0 AWG solid return
System voltage
1000 VDC
Voltage rating
1000 VDC
Series
DC photovoltaic applications
Enclosure
NEMA 4X
Enclosure material
304 stainless steel
Fuse configuration
Non-fusible
Switch type
Heavy duty
Protection
Non-fusible
Feature: 100 A amperage rating with 1000 Vdc system voltage capability. Business Impact: Enables safe, code-compliant DC isolation for mid-sized solar arrays without oversizing the switch, reducing capital expense while preserving protection. Application: Ideal for utility-scale and commercial PV installations requiring reliable single-circuit DC disconnect. Feature: NEMA 4X enclosure in 304 stainless steel. Business Impact: Delivers superior corrosion resistance and weatherproof performance in outdoor or wash-down environments, minimizing maintenance and downtime. Application: Outdoor PV sites, rooftop installations, and harsh industrial settings. Feature: Ungrounded, non-fusible design with one main lug configuration (#14-1/0 AWG). Business Impact: Simplifies electrical design and reduces fault pathways, supporting safer startup and service. Application: Solar DC isolators where ungrounded configurations are specified. Feature: Heavy duty switch construction with solid return paths. Business Impact: Improves reliability under frequent switching cycles, lowering replacement costs and downtime. Application: Repeated PV system shutdowns and reconfigurations in solar farms. Feature: 1 circuit, compatible with #14-1/0 AWG lug capacity. Business Impact: Streamlines wiring harness planning and installation, enabling quicker field terminations. Application: Standard PV branch circuits with common wire gauges. Feature: Certifications and standards alignment (NEC 690 per UL 1741, UL 98B). Business Impact: Supports compliance reporting and faster procurement approvals. Application: Regulated solar installations across commercial and industrial sectors. Industry context: In today’s PV projects, installers seek non-fusible, ung ro unded solutions that endure environmental stress while delivering straightforward installation and robust protection. The DCU1103UWM responds with a balanced hardware set, enabling predictable performance, easier maintenance planning, and reduced total cost of ownership for long-term solar investments.
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FAQs
DCU1103UWM requires a mounting location with adequate clearance for a single 100 A disconnect and 1000 Vdc rating. Plan for #14-1/0 AWG lug terminations, solid returns, and proper securing hardware. The NEMA 4X stainless enclosure provides weather resistance, so ensure outdoor mounting is level and shielded from direct impact while allowing easy access for maintenance.
Its 100 A amperage rating and 1000 Vdc system voltage are aligned with common solar PV string and combiners. The ungrounded, non-fusible design provides a straightforward isolation point, while the 304 stainless steel NEMA 4X enclosure ensures reliability in outdoor environments typical of rooftop and ground-mount PV installations.
DCU1103UWM is specified to NEC 690 per UL 1741 and UL 98B, ensuring solar circuit protection and enclosure integrity. The NEMA 4X enclosure in 304 stainless steel provides corrosion resistance and weather sealing, making it suitable for demanding outdoor PV applications and compliance documentation.
Ungrounded, non-fusible DC disconnects isolate the PV array without introducing a fuse path in the disconnect itself, reducing fault propagation risk and simplifying inspection. This configuration is common in PV safety strategies, provided that proper grounding, wiring practices, and system design meet applicable codes and project requirements.
Eaton provides a warranty under policy 25-000 with coverage for one year from installation or eighteen months from shipment, whichever occurs first. This includes support for manufacturing defects and reasonable troubleshooting. Customers should document installation dates and maintain records to activate warranty service.