Bals Elektrotechnik "HKS" panel domestic sockets type E / F / J are equipped with an auxiliary contact.
The contact is mounted on the contact carrier, and is being operated by the insertion/removing operation of the domestic plug. The auxiliary switch is last making and first breaking during the operation, and is standard provided as an NO – normally open contact (NC-normally close are available on request). The connection requires a separate wiring to the auxiliary contact pins.
The Bals Elektrotechnik HKS solution for Type F accepts also plugs of type C (Euro-Plug) to operate the auxiliary contact.