Auxiliary Switch Switron is a type of switch that is used in conjunction with a primary switch to control electrical circuits or devices. An auxiliary switch can be used to provide additional control or monitoring functions, such as signaling the status of a circuit or providing feedback to a control system. is a type of switch that is used in conjunction with a primary switch to control electrical circuits or devices. An auxiliary switch can be used to provide additional control or monitoring functions, such as signaling the status of a circuit or providing feedback to a control system.