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Download movie dhoom 3 in hd for pc |
Download movie dhoom 3 in hd for pc
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If you need assistance with the installation process, please visit our forum. There you can see a list of commonly asked questions about computer security and the best answers, as well as find answers to specific questions on our support forum. Field of the Invention The present invention relates to a vacuum switch, more particularly to a vacuum switch which has a load-side contact mechanism that can be operated in response to the load current.
Description of the Related Art A vacuum switch, which is used as an overcurrent protection device, operates in the manner described below when the load current flowing through it is excessive. Namely, a vacuum interrupter disposed in the vacuum switch is opened by the load current to interrupt a current flowing through the load-side contact mechanism.
In a conventional vacuum switch of this type, for example, a circuit to be protected is connected between both terminals of the vacuum switch, and an overcurrent flowing through the circuit is detected by means of a circuit-detecting circuit disposed on the side of the switch, such as a fuse or the like.
The circuit-detecting circuit is connected in series with the load-side contact mechanism, so that when the overcurrent is detected, it is possible to interrupt the load current flowing through the load-side contact mechanism. However, the vacuum switch described above has a disadvantage in that, when the overcurrent is detected by the circuit-detecting circuit, the load current flowing through the load-side contact mechanism is abruptly interrupted.
Thus, a considerable quantity of surge voltage is generated due to the load current and input capacitance connected to the load-side contact mechanism. This surge voltage is applied to the equipment connected to the vacuum switch.
Therefore, when the equipment is a switching power supply or the like, there is a problem in that the equipment becomes unstable. The surge voltage is generated also in a vacuum switch which has the above-described circuit-detecting circuit. However, this problem is more significant in a vacuum switch of the above-described type which has a load-side contact mechanism that can be operated in response to the load current.
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