The standard introduced a clear division of labor to ensure accountability throughout the supply chain: IEC 61439-1:2009 - Standard | IECEE

Specifies the integration of devices (like circuit breakers and converters) into an enclosure to form a complete system. Key Roles and Responsibilities

Covers everything from industrial motor control centers (MCCs) and power distribution boards to residential consumer units.

Applies to assemblies rated up to 1,000 V AC or 1,500 V DC .