Class 14 Non-Reversing Starters Siemens Class 14 Non-Reversing Starters feature a rugged industrial design and are available in NEMA Sizes 00 through 8. The Siemens Class 14 Non-Reversing Starters are designed for across-the-line starting of single-phase and polyphase motors. These controls offer solid-state overload protection as standard and dual-voltage, dual-frequency coils. NEMA starters are ideal for applications requiring dependability and durability. Typical applications include machine tools, air conditioning equipment, material handling equipment, and compressors.