The invention relates to a
crusher for mineral substances or recycled substances, comprising a crushing unit having a first crushing body, to which a movable second crushing body is assigned, between which crushing bodies a crushing gap is formed, a
hydraulic cylinder is coupled to one of the crushing bodies and is arranged and configured to allow a movement of the coupled crushing body that increases the width of the crushing gap during a deflection movement, the pressure space of the
hydraulic cylinder being coupled to a pressure chamber of a pressure
relief valve of an overload trigger device (30), the
piston of which can be adjusted between a closed position and an open position, the
piston has a closed position in which the fluid-conducting connection between the pressure chamber and the pressure compensation region is blocked and an open position in which the fluid-conducting connection is released, the
piston having a piston pressure surface, by means of which the piston defines the pressure chamber in the closed position. The piston has a surface region on the side facing away from the pressure chamber, which in the piston closed position defines a chamber region transversely to the piston adjustment direction in order to introduce a closing force into the piston in the chamber region under the action of pressure.