HOT PLUG INSERTION AND EXTRACTION DEVICE

摘要

A circuit unit to be inserted or removed by live wire work into or from a system having a plurality of circuit units and a power source to supply power to the plurality of circuit units includes a first circuit to supply power to the circuit unit from the power source when the circuit unit is inserted into the system; and a second circuit to supply power to the circuit unit in normal operation after the circuit unit is inserted into the system. The first circuit nearly stops supplying power about the time when the second circuit starts supplying power and by this arrangement, it becomes possible to vary the timing of inrush currents attending on a supply of power from a plurality of power sources. A removal permission indicator can be installed which can be turned on by a voltage supplied from the power source under a condition that permission to remove the unit has been issued. In order to adjust the unit inserting speed, a lever is mounted rotatably at one end of each circuit unit, for multiplying a force for removing said unit by using as a point of force application a certain point in said system under the condition that permission to remove the circuit unit has been issued. A connector of the circuit unit is structured so as to be freely movable at a mounting portion for several millimeters on the surface of a metal sheet when the system and the connector of the unit are connected mechanically and electrically.