conductor support sleeve 7 and biases the same toward conductive engagement with the bus bar 33 the release lever 5 has a generally u shaped configuration and includes a mounting leg 56 and an operating leg 57 joined by a connecting portion 58 the mounting leg 56 contains a pivot opening 51 by means of which the release lever is pivotally supported on the pivot shat 60 for pivotal movement about the fixed pivot axis 6 the mounting arm 56 carries the lateral operating projection 52 that engages the clamping leg portion 41 a as best shown in fig4 a 4 c the operating leg 57 carries the handle portion 53 which contains an operating recess 54 for receiving an operating tool such as the tip of a screwdriver the clamping spring 4 is normally in the unstressed expanded clamping condition shown in figs 1 3 a and 4 a whereupon the release lever 5 is in its initial closed clamping position with the spring clamping leg biasing the conductor sleeve 7 toward conductive engagement with the bus bar 33 the conductor 8 is thus connected with the pin terminals 311 for soldered connection with the desired distribution conductors not shown to open the connector for insertion and removal of the conductor sleeve 7 and the conductor 8 the user applies either manually or by an operating tool a downward force 59 fig4 a to the handle portion 53 thereby to pivot the release lever 5 in the direction 61 of fig1 the lateral operating.