Box contents: 1 piece. For level-dependent, direct switching on and off of AC pumps and for level control of three-phase pumps via control unit. On/off difference can be adjusted by changing the effective plunge switch cable length (= length of the cable from the attachment point to the plunge switch) in the range of 150-500 mm. Cable length 3 m; Number of poles: 1; Design: switch in float; Design of the switching function: N/O; Rated operating voltage Ue at AC: 250 V