Replacement switch for "Captive Key" Interlock System.
Commonly used on Cromartie Skutt and many other brands to comply with the Health & Safety Act 1974 still regarded as "best practice".
Has a switching capacity of up to 40 Amps per pole and can be used for 3 circuits single phase or to switch the 3 lives on three phase. Also can be used on "Double Pole" arrangement by using 2 of the 3 switched connections.