The features@ conventions@ characteristics and attributes identified in this guide are those of magnetic contactors and thermal overload relays. These are components which may be used alone@ or combined with other components@ to serve as full-voltage or reduced-voltage@ reversing or non-reversing@ single-speed or multi-speed motor controllers. Control products compared or contrasted in this guide are those with equivalent electrical ratings; such ratings are expressed via nameplates@ catalogues@ or technical literature.