Metal enclosed circuit breaker

A method for ventilating an exhaust tube of a metal enclosed circuit breaker comprising a first arcing contact and a second arcing contact, whereby the first arcing contact and/or the second arcing contact is axially movable along a switching axis, thereby forming, during a breaking operation, an arc between the first arcing contact and the second arcing contact in an arcing volume, whereby

• the exhaust tube is arranged in extension to the first arcing contact along the switching axis,
• the exhaust tube comprises a closed rear end opposite to the first arcing contact, said closed rear end is connectable to a rod for actuating the first arcing contact,
• the exhaust tube comprises a barrier element arranged within the exhaust tube defining a dead exhaust tube volume between the barrier element and the rear end, and comprising the step of:
• ventilating the dead exhaust tube volume through a hole extending through the barrier element.