Overview of the Siemens medium-voltage, air-insulated switch gear types GM-SG non-arc-resistant and GM-SG-AR arc-resistant with Siemens SIERS Siemens integrated electrical-racking system.

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https://w3.usa.siemens.com/powerdistribution/us/en/product-portfolio/Medium-Voltage-Switchgear/Pages/metal-clad-arc-resistant-switchgear.aspx