The Series 102 auxiliary switch from Electroswitch was designed for use in electrical utilities, and it offers unidirectional 90° indexing. It is available with up to 24 poles, making it suitable for a variety of power industry applications. By modifying a snap-action rotary switch design, the series allows lever arm activation and a quick break action for DC as well as AC switching. It is also capable of being further modified into several different configurations. Constructed with fully enclosed decks, double wiping contacts, and the ability to perform under extreme conditions of shock and vibration, the switch has its contacts enclosed in molded phenolic insulating disks with the stationary contacts/connecting terminals extending outside the disks to minimize resistance and heating.