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Square D DU221RB Safety Disconnect

Square D logo
Square D:
  • Disconnects, circuit breakers and enclosures for most applications
  • High quality

Product Information

Model Part No. Amps Volts AC Volts DC Size & Weight Price
Square D DU221RB Safety Disconnect893250330A240VAC7.25 × 3.75 × 9.63 in
4.7 lbs
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Many utilities require an AC disconnect between a grid-tie inverter and the AC load center, close to the AC service entrance, with a visible and lockable handle. A 30-amp 240-volt disconnect is good for up to 7.2kW and the 60-amp disconnect is good for up to 14.4kW.

Wholesale Solar recommends these Square D 240V NEMA 3R safety switch disconnects for use with gridtie inverters that don't already have pre-built disconnects. They are non-fusible, rated at 240 volts DC, and available in 30 amps or 60 amps.

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Features & Attributes

  • Dimensions (LxWxH): 7.25 × 3.75 × 9.63 inches
  • Weight: 4.7 lbs
  • Residential or light commercial applications
  • UL listed NEMA3R outdoor enclosure
  • Two-pole with lugs suitable for aluminum or copper wires
  • Quick reliable on-off operating mechanism
  • Exterior handle for positive visual that the switch is "off"
  • Lockable handle for safety of electrical or emergency personnel
  • UL listed to handle 30 or 60 amp at 240 VDC per pole
  • MPN: DU221RB
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Square D DU221RB Safety Disconnect

Spec. Sheet
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About Square D

Square D—A Schneider Electric Brand

One of the most trusted names in electrical distribution, power and control—from residential to industrial construction.


In 2003, the Square D by Schneider Electric brand celebrated its 100th anniversary. One hundred years of know-how and innovation in electricity and automation management.

1902: Founding of Detroit Fuse and Manufacturing which produced fuses in cases and fuse switches in boxes.

The reputation of the "D" logo emblazoned on the company's conduit boxes led the company to choose the name Square D. In the 1940s, Square D counted 10 factories in the United States and a workforce of 7,000, manufacturing half of all the circuit breakers used in aviation.

In the 1950s, the company opened its first European subsidiary. Subsidiaries were also opened in Asia and South Africa. The brand launched programmable robots, a new generation of boxes for residential use, a fire detector for protection against current overcharge and the detection/interruption of electric arcs.

In 1991, Schneider Electric acquired Square D.

Products and systems developed by the Square D by Schneider Electric brand are present in all sectors of activity, from circuit breakers to monitoring and control systems. The tertiary and residential building sectors are major consumers of Square D by Schneider Electric products.

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