This invention is related to a circuit breaker that comprises an empty box; a flexible wall device inside the empty box the central part of which moves in or out upon increasing or decreasing pressure on it and a switch to connect and disconnect the power. The flexible wall device is mounted so as to divide the box into two areas; one unsealed and the other is completely
sealed off.

The unsealed area comprises a switch to connect and disconnect the power. The sealed area comprises an opening in direct connection with the liquid or gas that operates the circuit breaker when its pressure increases or decreases. The power on/off switch is mounted so as its arm touches the central part of the flexible wall device.

A control system may be installed inside the unsealed area to control the distance between the circuit breaker arm and the central part of the flexible wall device. This system controls the operation of the circuit breaker upon different pressure values, according to operation requirements