The Schneider Electric Square D MD4100MI9 is a heavy-duty manual transfer switch designed for reliable power control in demanding industrial and commercial environments. This UL508 certified and NEMA 4X rated switch provides robust protection against dust, water, and corrosion, making it suitable for a wide range of applications where durability is paramount.

Technical details

• Series: Square D MD Series
• Configuration: Three-phase manual transfer switch
• Voltage Rating: 240V AC
• Current Rating: 100A
• Enclosure Rating: NEMA 4X (corrosion-resistant, watertight, dust-tight)
• Certification: UL508 listed
• Operation: Manual switching
• Terminal Type: Screw terminals
• Mounting: Surface mount

Applications & compatibility

This transfer switch is commonly utilized in applications requiring manual switching between power sources, such as backup generator connections for critical equipment, isolation of machinery for maintenance, or load shedding in facilities with multiple power feeds. Its robust construction ensures reliable operation in environments like food processing plants, chemical facilities, or outdoor electrical enclosures.

Available from Industrial Automation Co as new, refurbished, or surplus stock, backed by a 2-year warranty with same-day shipping on in-stock items. Request a quote for the Schneider Electric Square D MD4100MI9 or contact our technical team for cross-reference assistance with compatible Square D components.