Square D QMB321HW - Fusible Safety Switch 30A 240V (3-Pole NEMA 1)

Square D QMB321HW is a panel-mounted fusible safety switch designed for reliable circuit protection and isolation in industrial applications. This 3-pole switch operates at 240V AC with a 30A current rating and features a robust 200kA interrupting capacity at 240V for superior fault protection. The compact enclosure measures 114 mm x 78.49 mm x 112.78 mm (4.49" x 3.09" x 4.44") with a weight of 7.14 lb, constructed for NEMA 1 environments and accepting R, H, and K class fuses. Certified to UL and CSA standards, this switch accommodates wire sizes from 12 to 2 AWG aluminum or 14 to 4 AWG copper, making it suitable for three-phase power distribution systems, motor control circuits, and industrial machinery protection where safe disconnection and overload protection are critical.

Key Features & Specifications

• Type: Fusible safety switch, panel mounted, QMB Series E1-E2
• Voltage Rating: 240V AC
• Current Rating: 30A
• Dimensions: 114 mm x 78.49 mm x 112.78 mm (4.49" x 3.09" x 4.44")
• Standards: UL, CSA certified
• Applications: Industrial power distribution, motor control, machinery protection
• Switch Type: Fusible
• Configuration: Single
• Poles: 3
• Phase: 3
• AIC Rating: 200kA@240V
• Wire Size: 12 TO 2 AWG (Aluminum), 14 TO 4 AWG (Copper)
• Fuse Class: R, H, K
• NEMA Rating: 1
• Compatible Frames: ED
• Weight: 7.14 lb
• Mounting: Panel mount

Product Identification

• UPC: 785901748052
• GTIN: 00785901748052