35 is shown in fig4 against the one side of the bearing pin 22 if the arrangement now arrives in its end position the lubricant 34 is subjected due to its inertia to an acceleration which is sufficient to overcome the viscosity of the lubricant and to transport it into the part of the bearing gap which had remained unstressed during the preceding motion this is indicated by arrows 36 in fig3 vibration or impact caused by the sudden breaking of the parts also can contribute to the distribution of the lubricant into the bearing gap in opening the tilting motion described is executed in the reverse direction to this end the opening latch is released by means of a push button 37 fig1 whereby the support is removed from the stretched toggle lever arrangement in a manner known per se the control shaft 24 with a driving lever 23 mounted thereon now swings back counterclockwise into the position shown in fig1 the energy for carrying out this motion is now supplied by springs which are part of the contact arrangement 2 in a manner known per se and had been cocked during the preceding closing of the circuit breaker 1 in the course of this opening motion the opposite side of the bearing pin 22 is now stressed on which however lubricant had been deposited from the annular spaces 33 of the sleeve 31 in the manner explained thereby the wear is kept low in the desired manner as shown in observing the arrangement.