Self-blowout circuit breaker having a filling and overpressure valve

A self-blowout circuit breaker having contacts for connecting or disconnecting a circuit, the self-blowout circuit breaker comprising:

• at least one first arcing contact and one first rated current contact moveable back and forth in a direction of a longitudinal axis of the self-blowout circuit breaker;
• a compression volume which is connected to a heating volume by at least one non-return valve, wherein the heating volume is connected to an arc zone, such that when the first arcing contact is being disconnected from at least one associated second arcing contact, an arc is produced between the first and second arcing contacts in the arc zone;
• an exhaust volume, wherein the compression volume and the exhaust volume are filled with a gas;
• and
• a combined filling and overpressure valve that separates the compression volume from the exhaust volume, wherein the valve is an annular disk formed by at least one plate having at least one tab formed in the plate, and arranged around the longitudinal axis of the self-blowout circuit breaker.