OT Non Fusible Switch Disconnectors ABB OT series switch disconnectors are largely used as the main switch in low voltage switchgears or distribution of power, starting and stopping motors and isolating loads during maintenance. A wide range from 16 A to 160 A, available as either base plate or door mounted. Note Handles and shafts must be ordered seperately. See stock no. 686-7304 for shaft and stock no 686-7351 and range for handles in various sizes.