Abstract: A locking-type actuator for a rotary switch, in which a base plate (8) is slid over the actuating shaft (18) of the rotary switch (2) and secured to the rotary switch housing (6). A twist handle (10) secured so as to be torsionally fixed to the actuating shaft (18) is provided with at least one locking opening (32) for shackle connectors to be inserted. Displaceably supported in the twist handle (10) in a direction perpendicular to the actuating shaft axis (36) is a stopper (34), which is able to be externally manipulated to block or release the locking opening (32), and displaceably supported in the twist handle (10) parallel to the actuating shaft axis, is a locking pin (48), which is able to be actuated against a spring resilience.