Enclosed automatic transfer switch OXB250 250A 3-pole

The OXB250E3S4Q54B is a fully enclosed automatic transfer switch designed to ensure reliable delivery of critical power in demanding applications. Combining the switch and controller into a unified unit, this TruONE ATS minimizes installation complexity and optimizes operational performance. Built for rigorous environments, it meets IEC 60947-6-1 standards and features an IP54 degree of protection against dust and water ingress, making it suitable for industrial or commercial use.

 

This four-pole device supports delayed transition functionality with simultaneous switching on the fourth pole, offering compatibility with AC circuits rated between 200–480 V. Operational current ratings include AC-31B/AC-32B/AC-33B at up to 250 A for voltages from 200 to 415 V. Engineered with bolt terminals at bottom entry/exit positions and conventional thermal current ratings of up to 250 A (fully enclosed), the product provides robust connectivity options.

 

Constructed with steel sheet enclosures for durability, it also ensures high electrical safety through a rated impulse withstand voltage (Uimp) of 8 kV, insulation voltage (Ui) up to 1000 V, and short-time withstand capacity of 18 kA rms over a duration of 0.3 seconds. Additional features include direct-mounted handles for ease-of-operation and Level 4 controller integration featuring touch technology.

 

The compact design boasts dimensions of H:810 mm x W:610 mm x D:300 mm with reinforced construction weighing approximately 52 kg net (57 kg packaged). Engineered according to Pollution Degree 3 requirements under IEC guidelines, this product is suited for hazardous environments while compliant with EU directives including RoHS (2011/65/EU + amendment).

 

Ideal for infrastructure powering systems in industries such as oil & gas, manufacturing facilities or marine systems where uptime is critical; buyers can expect long-term reliability paired alongside ABB's established expertise in electrical solutions across decades globally