Siemens ECHS150 1-1/2" Type HS HubSiemens ECHS150 ECHS150 Product Description Siemens Low Voltage Residential Specialty Load Centers: Hubs. HS Type size 1 1 2 IN. About Siemens: Siemens is a global powerhouse focusing on the areas of electrification, automation and digitalization. One of the worlds largest producers of energy efficient, resource saving technologies. In infrastructure and industry solutions the company plays a pioneering role.