ABB Fireman Enclosed Switch is made of non-flammable aluminium alloy rigid silumin. It is painted red in order to be easy to spot. The ON and OFF positions are clearly indicated on the front side with I and O. The operating handle is designed in such a way that a fireman hook or axe can be used to switch OFF. To reset a so called two hands grip must be used. The interlocking mechanism prevents accidental manoeuvres.