As cited above a manufacturer has a duty to design a safe product. For example a pharmaceutical company should not release a product that causes heart attacks or other known adverse side effects, a toy manufacturer should not use lead paint, or a food company should not put toxic or deleterious foods on the shelves.
Where a product can’t be designed to be absolutely safe, then a manufacturer has a duty to guard or protect against that dangers presented by the product (i.e., automatic shut-off or safety guard). If a product’s dangerous susceptibility can’t be adequately guarded, the manufacturer has an obligation to provide clear instructions and warnings for its use (i.e., flammable or emits noxious chemicals, such as gasoline or kerosene).