Pressure trip unit for an electrical switch and electrical switch with such a pressure trip unit

A pressure trip unit for an electrical switch, comprising:

• an actuating element;
• and
• at least one flow channel, each at least one flow channel respectively corresponding to each of at least one electrical pole of the electrical switch,
• wherein each at least one pole of the electrical switch includes at least two switching contacts for making or disconnecting a flow path,
• wherein the at least two switching contacts of each at least one pole of the electrical switch are disconnectable via the actuating element, the actuating element being configured to respond to a pressure generated in a disconnection zone of each respective switching contact of the at least two switching contacts by an electric arc drawn in an event of an electrodynamic recoil of each of the switching contacts, and
• wherein the disconnection zone is connectable to the actuating element via the at least one flow channel, the at least one flow channel including a nonreturn valve to permit a flow only from the disconnection zone in a direction of the actuating element.