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GE MBM334WB - Main Breaker Kit 400A 3-Pole

United Fuses
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GE Industrial Systems MBM334WB is a 3-pole, 400 amp main breaker kit engineered for primary circuit protection in lighting panelboards and industrial power distribution systems. This bolt-on mounted unit operates at 480/277 VAC with a 65 kiloamp interrupting capacity (KAIC), ensuring robust fault current handling. The breaker kit weighs 5.19 lb and is constructed as part of the PRO-STK XT5 series, featuring a standard trip unit for reliable overcurrent protection. It meets industry standard certifications for safety and performance in demanding electrical environments. Typical applications include commercial and industrial lighting panelboards requiring high-amperage main circuit protection.

Key Features & Specifications
  • Type: 3-Pole Main Breaker Kit
  • Amperage: 400 A
  • Voltage: 480/277 VAC
  • Interrupting Capacity: 65 KAIC
  • Mounting Type: Bolt-On
  • Series/Frame: PRO-STK XT5
  • Trip Unit: Standard Trip
  • Certifications: Industry Standard Compliant
  • Application: Lighting Panelboards
  • Weight: 5.19 lb


Product Identification
  • UPC: 78317587860
  • GTIN: 00783175878604