The basic and typical function of the labour law is its protection function which is oriented mainly towards the weaker party of the employment relationship – the employee. However, this function should be maintained also in relation to the employer. An important area of activity of employees’ representatives – the trade union is the area of collective bargaining. In the context of collective bargaining there may also occur the realisation of a strike which we will address from the perspective of the “balanced protective function” of the labour law. The aim of the paper is to investigate the possible limits of the right to strike, especially in terms of “maintaining the existence” of the employer (especially in plants where the interruption of operation can cause ecological disasters and threats to the lives of employees).