Motor starter protectors are compact, current limiting motor starter protectors which are optimized for load feeders. The motor starter protectors are used for switching and protecting 3-phase induction motors. 3RV1 motor starter protectors are suitable for use in any climate. They are intended for use in enclosed rooms in which no severe operating conditions (such as dust, caustic vapours, hazardous gases) prevail. When installed in dusty and damp areas, suitable enclosures must be provided. 3RV1 motor starter protectors can optionally be fed from the top or from below. Class-10 without auxiliary switches and with increased switching capacity.