Over pressure disconnection or Break Action Mechanism

Protection against Overload and Failure at the end of Service Life:

In the event of over-voltage or thermal overload or ageing at the end of the capacitor‘s useful service life, an increasing number of self-healing breakdowns may cause a rising pressure inside the capacitor, due to the gases released from the self-healings. To prevent it from bursting, the capacitor is fitted with an obligatory «break action mechanism» (BAM), also known as over-pressure disconnector. This safety mechanism is based on a weakened spot in one, two, or all of the connecting wires inside the capacitor. With rising pressure the case begins to expand, mainly by opening the folded crimp and pushing the lid upwards. As a result, the prepared connecting wires are separated at the weakened spot (at a predefined force), 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. Also note that sufficient clearance must be kept above the capacitor to allow the capacitor to expand. The video below shows the operation of the Electronicon power factor correction capacitor. For more information visit Electronicon(India) web page.

BAM video Electronicon