ABB SPBRC300 Harmony Bridge Controller – HR Series ABB SPBRC300 is a Harmony Rack (HR Series) Bridge Controller used in ABB Ability™ Symphony® Plus control systems. ABB identifies the SPBRC300 as one of the HR Series BRC controllers, together with the SPBRC400 and SPBRC410. The HR Series was developed to support existing Harmony control investments while providing compatibility with multiple generations of Harmony and related I/O systems. Product Specifications Manufacturer