Eaton DCU1105FWM DC Disconnect - UL Listed 1000 VDC
Part Number: DCU1105FWM
Quick Summary
DC disconnects from Eaton provide a rugged, single-pole solution for solar PV systems up to 1000 VDC. This device addresses a common industry pain point: safe, reliable isolation during maintenance in harsh environments. With UL Listed protection and a NEMA 4X enclosure, the unit delivers corrosion resistance and weatherproof operation. The 304 stainless steel enclosure and fusible protection support durable, code-compliant safety for outdoor installations, while robust 400 A capacity enables scalable PV projects. In addition, its compact mounting footprint and clear labeling help integrate into existing electrical rooms and outdoor pads, supporting efficient installation and long-term asset reliability.
Product Information
Extended Description
DCU1105FWM Eaton: Eaton Heavy duty DC disconnect, DCU, 400 A, DC photovoltaic systems, Grade 304 stainless steel, Fusible, Max:1000 Vdc, NEMA 4X, 1, Fusible
Product Name
Eaton heavy duty DC disconnect
Catalog Number
DCU1105FWM
UPC
786685866239
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
304 stainless steel
Fuse configuration
Fusible
Switch type
Heavy duty
Protection
Fusible
Feature: 400 A amperage rating with a single circuit configuration. Business Impact: Handles mid-to-large PV arrays without needing multiple disconnects, reducing wiring complexity and labor costs during installation. Application: Suited for rooftop and small utility-scale PV installations where a single, reliable isolation point is required. Feature: Fusible protection integrated into a heavy-duty disconnect. Business Impact: Provides fast, predictable fault isolation, minimizing arc flash exposure and downtime during maintenance. Application: Critical for safe solar interfacing and code-compliant protection in harsh environments. Feature: Maximum voltage of 1000 VDC. Business Impact: Enables use across modern PV strings and higher system voltages, reducing the number of disconnects in the field. Application: Ideal for new solar projects and retrofit installations seeking simplified DC protection. Feature: NEMA 4X enclosure in 304 stainless steel. Business Impact: Delivers superior corrosion resistance and weather sealing, extending service life in outdoor and wash-down environments. Application: Outdoor installations and harsh industrial settings demanding durable protection. Feature: UL Listed certification. Business Impact: Supports regulatory compliance and accelerates project approvals, reducing procurement risk. Application: Essential for utility-grade and commercial solar deployments. Feature: Dimensions and weight (12.43 in D, 24.12 in W, 57.47 in H; 120.5 lb). Business Impact: Clear space planning and mounting considerations, enabling accurate site layouts and reduced installation surprises. Application: Large-format installations where enclosure footprint is a primary design constraint. Feature: 1-year warranty (or 18 months from shipment). Business Impact: Provides peace-of-mind coverage and lowers lifecycle risk, supporting total cost of ownership (TCO) planning. Application: Standard procurement expectation for industrial electrical protection devices.
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FAQs
The DCU1105FWM is a single-circuit, 400 A DC disconnect with a NEMA 4X enclosure and 304 stainless steel body. Plan for weatherproof installation, adequate clearance for wiring and fuse access, and compatible mounting hardware. Ensure outdoor or semi-exposed locations meet enclosure rating requirements and provide easy field access for maintenance and fuse replacement.
Key specs include a 400 A amperage rating, 1 circuit, maximum voltage of 1000 VDC, and fusible protection. Designed for solar applications, it supports up to 1000 VDC strings while enabling a single, centralized disconnect. These specs simplify circuit planning, reduce wiring complexity, and help meet safety and interconnection standards for modern PV installations.
Yes. The unit is built for outdoor and rugged environments with a NEMA 4X enclosure and 304 stainless steel construction, making it suitable for rooftop and ground-mounted PV systems. Its weight and dimensions require careful site planning, but the robust build supports long service life in varied climates while maintaining safe operation.
The DCU1105FWM is UL Listed and features a NEMA 4X enclosure, reinforcing safety and reliability for solar installations. UL Listing ensures compliance with recognized safety standards, while the NEMA 4X rating confirms protection against water and corrosion in outdoor settings, both critical for utility-scale and commercial PV projects.
With fusible protection and a one-year warranty (or 18 months from shipment), regular fuse inspection and timely replacement are essential to maintain performance. The unit’s durable stainless steel enclosure reduces corrosion-related downtime, while a single disconnect simplifies maintenance, potentially lowering labor costs and improving system availability over the PV array’s lifecycle.