Overpressure protection, BAM: The BAM ("Break Action Mechanism") is based on an attenuated spot at one or several of the connecting wires inside the capacitor. With rising pressure the case begins to expand, mainly by opening the folded crimp in the aluminium can and pushing the lid upwards. As a result, the prepared connecting wires are separated at the attenuated spot, and the current path is interrupted irreversibly. It has to be noted that this safety system can act properly only within the permitted limits of loads and overloads.